Keyword: electron
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MOAO02 Beam Instrumentation and Diagnostics for High Luminosity LHC luminosity, vacuum, diagnostics, detector 1
 
  • M. Krupa
    CERN, Geneva, Switzerland
 
  The High Luminosity LHC projects aims to increase the integrated luminosity of the LHC experiments by an order of magnitude. New and upgraded beam instrumentation is being developed to cope with much brighter beams and to provide the additional novel diagnostics required to assure safe and efficient operation under the new LHC configuration. This contribution discusses the various ongoing developments and reports on the results obtained with prototypes for transverse position, intra-bunch position, transverse size and profile, and beam halo monitoring.  
slides icon Slides MOAO02 [15.308 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOAO02  
About • paper received ※ 05 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOBO01 Overview of the Beam Instrumentation and Commissioning Results from the BNL Low Energy RHIC Electron Cooling Facility gun, laser, cathode, MMI 14
 
  • T.A. Miller, Z. Altinbas, D. Bruno, J.C. Brutus, M.R. Costanzo, L. DeSanto, C. Degen, K.A. Drees, A.V. Fedotov, W. Fischer, J.M. Fite, D.M. Gassner, X. Gu, J. Hock, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, D. Kayran, J. Kewisch, C. Liu, K. Mernick, R.J. Michnoff, M.G. Minty, S.K. Nayak, L.K. Nguyen, P. Oddo, R.H. Olsen, M.C. Paniccia, W.E. Pekrul, I. Pinayev, V. Ptitsyn, V. Schoefer, S. Seletskiy, H. Song, A. Sukhanov, P. Thieberger, J.E. Tuozzolo, D. Weiss
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Con-tract No. DE-AC02-98CH10886 with the U.S. Department of Energy
The Low Energy RHIC Electron Cooling (LEReC) facility at BNL demonstrated, for the first time, cooling of ion beams using a bunched electron beam from an SRF accelerating cavity and photoinjector. LEReC is planned to be operational to improve the luminosity of the Beam Energy Scan II physics program in RHIC in the following two years. In order to establish cooling of the RHIC Au ion beam using a 20 mA, 1.6 MeV bunched electron beam; absolute energy, angular and energy spread, trajectory and beam size were precisely matched. A suite of instrumentation was commissioned that includes a variety of current transformers, capacitive pick-up for gun high voltage ripple monitor, BPMs, transverse and longitudinal profile monitors, multi-slit and single-slit scanning emittance stations, time-of-flight and magnetic field related energy measurements, beam halo & loss monitors and recombination monitors. The commissioning results and performance of these systems are described, including the latest design efforts of high-power electron beam transverse profile monitoring using a fast wire scanner, residual gas beam induced fluorescence monitor, and Boron Nitride NanoTube (BNNT) screen monitor
 
slides icon Slides MOBO01 [17.119 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOBO01  
About • paper received ※ 05 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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MOBO02 Beam Instrumentation at the Fermilab IOTA Ring MMI, proton, experiment, controls 21
 
  • N. Eddy, D.R. Broemmelsiek, K. Carlson, D.J. Crawford, J.S. Diamond, D.R. Edstrom, B.J. Fellenz, M.A. Ibrahim, J.D. Jarvis, V.A. Lebedev, S. Nagaitsev, J. Ruan, J.K. Santucci, A. Semenov, V.D. Shiltsev, G. Stancari, A. Valishev, D.C. Voy, A. Warner
    Fermilab, Batavia, Illinois, USA
  • N. Kuklev, I. Lobach
    University of Chicago, Chicago, Illinois, USA
  • S. Szustkowski
    Northern Illinois University, DeKalb, Illinois, USA
 
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The Integrable Optics Test Accelerator (IOTA) is a storage ring at the end of the Fermilab Accelerator Science and Technology (FAST) facility. The complex is intended to support accelerator R&D for the next generation of particle accelerators. The IOTA ring is currently operating with 150 MeV electrons injected from the FAST Linac and will also receive 2.5 MeV protons from the IOTA Proon Injector currently be installed. The current instrumentation and results along from the first electron commissioning run will be presented along with future plans.
 
slides icon Slides MOBO02 [47.588 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOBO02  
About • paper received ※ 09 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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MOCO01 Online Touschek Beam Lifetime Measurement Based on the Precise Bunch-By-Bunch Beam Charge Monitor SRF, storage-ring, software, injection 35
 
  • B. Gao, F.Z. Chen, Y.B. Leng
    SSRF, Shanghai, People’s Republic of China
  • Y.M. Zhou
    SINAP, Shanghai, People’s Republic of China
 
  Beam current and lifetime are the most important parameters to characterize the beam and machine quality of an electron storage ring. In order to describe the behavior of all electron bunches completely and accurately, a precisely bunch-by-bunch charge monitor has been developed at SSRF. Method called two-point equilibrium sampling is introduced to avoid the influence of longitudinal oscillation on the sampling point, thanks to this, the resolution of the BCM was below 0.2 pC. Utilizing the advantages of BCM’s high refresh rate and high resolution, the system can meet the requirement of monitor the bunch-by-bunch beam lifetime, measure touschek lifetime and vacuum lifetime. In this paper, experiments and and analysis will be described in detail.  
slides icon Slides MOCO01 [18.156 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO01  
About • paper received ※ 03 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOCO04 Overview of Bunch-Resolved Diagnostics for the Future BESSY VSR Electron-Storage Ring diagnostics, timing, operation, storage-ring 49
 
  • G. Schiwietz, J.G. Hwang, M. Koopmans, M. Ries
    HZB, Berlin, Germany
 
  The upgrade of the BESSY II light source in Berlin towards the Variable pulse-length Storage-Ring BESSY VSR will lead to a complex fill pattern. This involves co-existing electron bunches with significant variations of bunch-length, bunch charge as well as charge density. Among many other boundary conditions, this calls for bunch resolved measurements with sub-ps time resolution and micrometer spatial resolution. Currently, we are constructing a diagnostic platform connected to three new dipole beamlines for visible light as well as THz measurements. The mid-term aim is a 24/7 use of beam-diagnostic tools and the development of advanced methods for specific purposes. Recently, we have set-up a sub-ps streak camera* and we are investigating other innovative methods for bunch-length** as well as lateral size determination using visible light*** at the first of our new diagnostic dipole beamlines. Preliminary results as well as our concepts for achieving high sensitivity, good signal-to-noise ratio and time resolution will be presented and discussed at the conference.
* G.Schiwietz et al., J.Phys.:Conf. Series 1067, 072005 (2018)
** T.Mitsuhashi, M.Tadano, Proc. of EPAC’02, Paris, France, p. 1936
*** J.Breunlin et al., NIM- A803, pp.55 (2015) &refs. therein
 
slides icon Slides MOCO04 [10.924 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO04  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP003 Beam Current Measurements with Sub-Microampere Resolution using CWCT and BCM-CW-E linac, instrumentation, electronics, acceleration 62
 
  • F. Stulle, L. Dupuy, E.T. Touzain
    BERGOZ Instrumentation, Saint Genis Pouilly, France
  • W.A. Barth, P. Forck, M. Miski-Oglu, T. Sieber
    GSI, Darmstadt, Germany
 
  The CWCT current transformer and its accompanying BCM-CW-E electronics allow accurate, high-resolution beam current measurements. This is achieved by combining a high-droop current transformer with low-noise sample-and-hold electronics. Thanks to a fast response time on the microseconds level the system can be applied not only to CW beams but also macropulses. Pulse repetition rates may range from 10MHz to 500MHz, rendering CWCT and BCM-CW-E suitable for a wide variety of accelerators. We report on test bench measurements achieving sub-microampere resolution. And we discuss results of beam measurements performed at the cwLINAC (GSI), which confirm the expected performance.  
poster icon Poster MOPP003 [6.507 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP003  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP004 Development and Calibration of a Multi-Leaf Faraday Cup for the Determination of the Beam Energy of a 50 MeV Electron LINAC in Real-Time detector, radiation, proton, linac 66
 
  • C. Makowski, A. Schüller
    PTB, Braunschweig, Germany
 
  The Physikalisch-Technische Bundesanstalt (PTB), Germany’s national primary standard laboratory, operates an electron LINAC with variable energy (0.5 - 50 MeV). All parameters of the LINAC which influence the RF power (as e.g. the high voltage at modulator) as well as the number of charged particles in a bunch to be accelerated (as e.g. via gun emission) also change the beam energy. To measure the energy during the preparation or optimization of a beam, a Multi-Leaf Faraday Cup (MLFC) was developed. This MLFC allows the measurement of energy and pulse charge in real time, so the influence of the manipulated variables on energy and beam power can be immediately assessed. The MLFC consists of 128 electrically isolated Al plates where the thickness of the entire stack is sufficient to stop a 50 MeV electron beam. After each beam pulse, the charge collected by the Al plates is recorded sequentially. The MLFC was calibrated with monoenergetic electron beams at output of a magnetic spectrometer. Then the MLFC was installed at the end of the accelerator structure. From the recorded charge distributions, the corresponding energy is determined in real time and displayed for each beam pulse.  
poster icon Poster MOPP004 [3.739 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP004  
About • paper received ※ 30 August 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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MOPP011 A Dual Functional Current Monitor for Stripping Efficiency Measurement in CSNS electronics, proton, injection, operation 95
 
  • W.L. Huang, F. Li, R.Y. Qiu, A.X. Wang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • M.Y. Huang, M.Y. Liu, T.G. Xu
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work is supported by National Natural Science Fund(No.11605214).
China Spallation Neutron Source (CSNS), the biggest platform for neutron scattering research in China, has been finished construction and already in user operation stage by the end of 2017. During the multi-turn charge-exchange injection, H stripping by a carbon primary stripper foil (100 ’g/cm2) and a secondary stripper foil (200 ’g/cm2) is adopted for this high intensity proton synchrotron. In order to evaluate the stripping efficiency and the foil aging, a dual-function low noise current transformer and corresponding electronics are designed to measure the ultra-low intensity of H and H0, which are not stripped completely by the 1st foil but totally stripped charge changing to H+ and delivered to the IN-DUMP. The self-designed CT sensors made of domestic nanocrystalline toroids, the noise analysis and elimination, measurement results and further improvement proposals are presented in this paper.
 
poster icon Poster MOPP011 [3.186 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP011  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP012 Development of Compact Ionization Chambers for Particle Therapy Facilities proton, electronics, radiation, high-voltage 99
 
  • M. Liu, C.X. Yin
    SSRF, Shanghai, People’s Republic of China
 
  Dose monitors and position monitors are critical equipment for particle therapy facilities. Performance of the monitors affects precision of irradiation dose and dose distribution. Parallel plate ionization chambers with free air are adopted for dose monitors and position monitors. Radiation-hardened front-end electronics are integrated in the chambers, and the output of the chambers are digital signals. The structure of the monitors is compact, modularized and easy-to-use. The ionization chambers are implemented successfully in Shanghai Advanced Proton Therapy Facility. The development details and implementation status are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP012  
About • paper received ※ 02 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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MOPP014 Design of the ESS MEBT Faraday Cup radiation, MEBT, proton, operation 105
 
  • A. Rodríguez Páramo, I. Bustinduy, I. Mazkiaran, R. Miracoli, V. Toyos, S. Varnasseri, D. de Cos, C. de la Cruz
    ESS Bilbao, Zamudio, Spain
  • E.M. Donegani, J.P.S. Martins
    ESS, Lund, Sweden
 
  The European Spallation Source (ESS) is currently under construction and the Medium Energy Beam Transfer (MEBT) is developed by ESS-Bilbao as an in-kind contribution. In the MEBT a set of diagnostics is included for beam characterization, among them the MEBT Faraday Cup is used to measure beam current and as a beam stopper for the commissioning modes. The main challenges for the design and manufacturing of the Faraday Cup are the high irradiation loads and the necessity of a compact design due to the space constraints in the MEBT. We describe the design of the FC, characterized by a graphite collector, required to withstand irradiation, and a repeller for suppression of secondary electrons. For the operation of the Faraday Cup acquisition electronics and control system are developed, all systems have been integrated in the ESS-Bilbao ECR ion source to test operation under beam conditions. In this work, we discuss the design of the Faraday Cup, the results of the tests and how they agree with the expected performance of the Faraday Cup.  
poster icon Poster MOPP014 [1.786 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP014  
About • paper received ※ 02 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP015 Charge Detection System for the CLARA/VELA Facility MMI, experiment, simulation, controls 110
 
  • S.L. Mathisen, Y.M. Saveliev, R.J. Smith
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  The CLARA/VELA facility at Daresbury Laboratory combines an FEL test facility and an electron accelerator for scientific and industrial applications, capable of providing up to 40 MeV electrons, with an eventual goal of 250 MeV. Accurate measurement of the bunch charges in a wide range (1 - 250 pC) at a repetition rate up to 400 Hz is required. We present a new system of analogue electronics developed to interface with existing and future bunch charge measurement devices (wall current monitors, faraday cups, etc.) to measure the bunch charges accurately and precisely. The system is based on a charge amplifier with switchable sensitivity, dark current gating and on-board self-calibration. Results of circuit simulations, offline calibration tests and online beam tests of a prototype system are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP015  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOPP016 Particle interactions with diamond detectors neutron, detector, site, photon 114
 
  • C. Weiss, M. Cerv, E. Griesmayer, P. Kavrigin
    CIVIDEC Instrumentation, Wien, Austria
 
  Chemical vapor deposition (CVD) diamond as radiation detector material has a wide range of applications, in par- ticular for harsh radiation environments and at high tem- peratures. The sensitivity of diamond is exploited in meas- urements with charged particles, neutrons and photons. Diamond detectors are used as beam loss monitors in particle accelerators, for photon detection in Synchrotron Light Sources, for neutron diagnostics in thermal neutron fields and for Deuterium-Deuterium (D-D) fusion and Deuterium-Tritium (D-T) fusion plasma neutrons. In this paper we present the simulated and measured re- sponse functions of single-crystal (sCVD) diamond detec- tors to charged particles, heavy ions, thermal neutrons, fast neutrons, X-rays and gamma radiation. All measurements were performed with CIVIDEC diamond detectors and re- lated electronics [1] at various research facilities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP016  
About • paper received ※ 09 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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MOPP017 New Beam Loss Monitor System at SOLEIL detector, storage-ring, electronics, injection 117
 
  • N. Hubert, M. El Ajjouri, D. Pédeau
    SOLEIL, Gif-sur-Yvette, France
 
  SOLEIL is currently upgrading its Beam Loss Monitor (BLM) system from pin-diode detectors to plastic scintillators associated with photosensor modules. This new kind of monitor, associated to its dedicated electronics, can be used to record slow or fast losses. Monitors have been calibrated with a diode and with a Cesium source. Both methods are compared. After preliminary tests, a first set of 20 new BLMs have been installed on 2 cells of the storage ring. Installation setup, calibration procedure and first measurements will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP017  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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MOPP019 Development and Evaluation of an Alternative Sensor Lifetime Enhancement Technique Used with the Online-Radiation-Monitoring System (DosiMon) at the European XFEL at DESY, Hamburg radiation, FEL, operation, controls 121
 
  • F. Schmidt-Föhre, S. Arab, D. Nölle, R. Susen
    DESY, Hamburg, Germany
 
  The European XFEL (E-XFEL), that started operation in September 2017 at the DESY/XFEL site in Hamburg/Germany uses a single-tunnel concept, forcing all frontend machine devices and electronics to be located inside the accelerator tunnel. Electro-magnetic showers, mainly produced by gun dark-current, RF cavity field-emission and beam-losses expose these devices to damaging irradiation. The new Online-Radiation-Monitoring-System (DosiMon) is mainly used for surveillance of radiation sensitive permanent magnet structures, diagnostic devices and rack-housed electronics. The integrated dose from Gamma- and optional future Neutron-radiation measurements can be monitored online by the DosiMon system. Safety limits ensure the correct function of monitored devices, provided by lifecycle estimations as measures for on time part exchange, to prevent significant radiation damage. A first expansion state currently enables more than 500 gamma measuring points. The development of a new sensor lifetime enhancement technique for the utilized RadFet sensors is presented together with corresponding evaluation measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP019  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP024 Development of New Loss Monitor Electronics for the HIPA Facility hardware, Linux, ISOL, network 140
 
  • R. Dölling, E. Johansen, W. Koprek, D. Llorente Sancho, M. Roggli
    PSI, Villigen PSI, Switzerland
 
  A replacement for the ageing electronics of loss monitors at HIPA is under development. We discuss requirements, concepts and first tests of a prototype.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP024  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP030 Preliminary Test of XBPM Local Feedback in TPS feedback, photon, operation, synchrotron 162
 
  • P.C. Chiu, J.-Y. Chuang, K.T. Hsu, K.H. Hu, C.H. Huang
    NSRRC, Hsinchu, Taiwan
 
  TPS is 3-GeV synchrotron light source which have opened for public users since September 2016 and now offers 400 mA top-up mode operation. The requirements of the long term orbit stability have been gradually more and more stringent. The report investigates the long-term orbit stability improved by applying local XBPM feedback.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP030  
About • paper received ※ 02 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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MOPP032 Fast Feedback Using Electron Beam Steering to Maintain the X-Ray Beam Position at a Monochromatic X-Ray Diagnostic at Diamond Light Source feedback, synchrotron, power-supply, controls 171
 
  • C. Bloomer, G. Rehm, A. Tipper
    DLS, Oxfordshire, United Kingdom
 
  A new feedback system is being developed at Diamond Light Source, applying a modulation to the position of the electron beam to keep the synchrotron X-ray beam fixed at the sample-point. Beamline detectors operating in the 100-1000Hz regime are becoming common, and the X-ray beam stability demanded by beamlines is thus of comparable bandwidths. In this paper we present a feedback system operating at these bandwidths, using a diagnostic instrument permanently installed in the X-ray beam path to measure the error in beam position at the sample point, and fast air-cored magnets to apply a small modulation to the electron beam to compensate. Four magnets are used to generate electron beam bumps through an ID straight. This modulation of the beam away from the nominal orbit is small, less than 10 microns, but should be sufficient to compensate for the bulk of the X-ray motion observed at the sample. It is small enough that the impact on the machine will be negligible. This system aims to maintain X-ray beam stability to within 3% of a beam size, at bandwidths of up to 500Hz.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP032  
About • paper received ※ 09 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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MOPP035 Electron Beam Diagnostics Concept for the LWFA Driven FEL at ELI-Beamlines diagnostics, FEL, cavity, plasma 185
 
  • K.O. Kruchinin, D. Kocon, A.Y. Molodozhentsev
    ELI-BEAMS, Prague, Czech Republic
  • A. Lyapin
    JAI, Egham, Surrey, United Kingdom
 
  Uniquely short high energy electron bunches produced by compact Laser Wakefield Accelerators (LWFA) are attractive for the development of new generation Free Electron Lasers (FEL). Although the beam quality of LWFA is still significantly lower than provided by conventional accelerators, with persistent progress seen in the area of laser plasma acceleration, they have a great potential to be considered the new generation drivers for FELs and even colliders. A new LWFA based FEL project called "LUIS" is currently being commissioned at ELI-beamlines in Czech Republic. LUIS aims to demonstrate a stable generation of X-ray photons with a wavelengths of 6 nm and lower, suitable for user applications. Electron beam diagnostics are absolutely crucial for achieving LUIS’s aims. Low charge, poor beam stability and other beam properties inherent for a LWFA require rethinking and adaptation of the conventional diagnostic tools and, in some cases, development of new ones. In this paper we provide an overview of the electron beam instrumentation in LUIS with a focus on the current challenges and some discussion of the foreseen future developments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP035  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOPP037 Status of Beam Instrumentation for FAIR HEBT diagnostics, detector, proton, antiproton 194
 
  • M. Schwickert, P. Boutachkov, T. Hoffmann, H. Reeg, A. Reiter, B. Walasek-Höhne
    GSI, Darmstadt, Germany
 
  At present the Facility for Antiproton and Ion Research (FAIR) is under construction at the GSI site. As part of the FAIR project the beamlines of the High Energy Beam Transport (HEBT) section interconnect the synchrotrons, storage rings and experimental caves. The large range of beam energies (MeV to GeV) and beam intensities up to 1012 particles per pulse for uranium, or up to 2·1013 particles per pulse for protons, demand in many cases for purpose-built beam diagnostic devices. Presently, the main diagnostic components are being manufactured by international in-kind partners in close collaboration with GSI. This contribution presents an overview of the beam instrumentation layout of the FAIR HEBT and summa-rizes the present status of developments for HEBT beam diagnostics. We focus on the status of the foreseen beam current transformers, particle detectors, scintillating screens and profile grids.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP037  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOPP048 Development of the Linac Extension Area 450-MeV Electron Test Beam Line at the Advanced Photon Source* linac, experiment, gun, laser 220
 
  • W. Berg, J.C. Dooling, S.H. Lee, Y. Sun, A. Zholents
    ANL, Lemont, Illinois, USA
 
  Funding: *Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-ACO2O6CH11357.
A low-emittance electron beam line for accelerator-based R&D hardware experimentation and study of novel accelerator techniques is under development at the injection linac of the Advanced Photon Source (APS). The Linac Extension Area (LEA) beam line will operate at the full 400 MeV energy of the APS linac. The electron beam is generated from a photo-cathode (PC) electron gun delivering 300 pC of charge with a 3 ps, rms bunch length and normalized beam emittance of ~ 1 micron. The bunch length can be compressed to 150 fs in a flexible chicane at a beam energy of 150 MeV. The APS linac contains an extensive set of conventional and advanced beam diagnostics including a recently commissioned s-band transverse deflecting cavity. The low-emittance electron beam is transported to an independent experimental tunnel enclosure that contains the LEA beam line. Implementing the LEA beam line separate from the APS injector complex allows for on-demand access to the area to perform work without interrupting beam operations of the APS. We discuss the overall scheme of the existing linac beam delivery & diagnostic systems, and report the design of the LEA beam line and initial planned experiments.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP048  
About • paper received ※ 05 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUAO02 Beam-Loss Detection for LCLS-II radiation, detector, linac, gun 230
 
  • A.S. Fisher, C.I. Clarke, B.T. Jacobson, R.A. Kadyrov, E. Rodriguez, L. Sapozhnikov, J.J. Welch
    SLAC, Menlo Park, California, USA
 
  SLAC is now installing LCLS-II, a superconducting electron linac driven by continuous RF at 1.3 GHz. The 4-GeV, 120-kW beam has a maximum rate of nearly 1 MHz and can be switched pulse-by-pulse to either of two undulators, to generate hard and soft x rays. Two detector types measure beam losses. Point beam-loss monitors (PBLMs) set limits at critical loss points: septa, beam stoppers and dumps, halo collimators, protection collimators (which normally receive no loss), and zones with weak shielding. PBLMs are generally single-crystal diamond detectors, except at the gun, where a scintillator on a PMT is more sensitive to the low-energy (1 MeV) beam. Long beam-loss monitors (LBLMs) use 200-m lengths of radiation-hard optical fiber, each coupled to a PMT, to capture Cherenkov light from loss showers. LBLMs protect the entire 4-km path from gun to beam dump and locate loss points. In most regions two fibers provide redundancy and view the beam from different angles. Loss signals are integrated with a 500-ms time constant and compared to a threshold; if exceeded, the beam is stopped within 0.2 ms. We report on our extensive tests of the detectors and the front-end signal processing.  
slides icon Slides TUAO02 [4.268 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUAO02  
About • paper received ※ 03 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUAO03 Beam Loss Measurements Using the Cherenkov Effect in Optical Fiber for the BINP ee+ Injection Complex extraction, radiation, beam-losses, experiment 234
 
  • Yu.I. Maltseva, A.R. Frolov, V.G. Prisekin
    BINP SB RAS, Novosibirsk, Russia
 
  Optical fiber based beam loss monitor (OFBLM) has been developed for the 500 MeV BINP Injection Complex (IC). Such monitor is useful for accelerator commissioning and beam alignment, and allows real-time monitoring of ee+ beam loss position and intensity. Single optical fiber (OF) section can cover the entire accelerator instead of using a large number of local beam loss monitors. In this paper brief OFBLM selection in comparison with other distributed loss monitors was given. Methods to improve monitor spatial resolution are discussed. By selecting 45 m long silica fiber (with a large core of 550 um) and microchannel plate photomultiplier (MCP-PMT), less than 1 m spatial resolution can be achieved.  
slides icon Slides TUAO03 [3.053 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUAO03  
About • paper received ※ 05 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUAO04 Commissioning of the ARIEL E-LINAC Beam Loss Monitor System MMI, dipole, linac, target 239
 
  • M. Alcorta, A.D. D’Angelo, D. Dale, H. Hui, B. Humphries, S.R. Koscielniak, K. Langton, A. Lennarz, R.B. Nussbaumer, T. Planche, M. Rowe, S.D. Rädel
    TRIUMF, Vancouver, Canada
 
  The commissioning of the Advanced Rare Isotope & Electron Linac (ARIEL) facility at TRIUMF is underway. The 30 MeV e-linac has successfully been commissioned to 100 W, and to further increase the power to 1 kW the beam loss monitor system (BLM) for fast Machine Protection must be fully operational. There are currently two types of BLMs employed in the e-linac; long-ionization chambers (LIC) and scintillators, consisting of a small BGO coupled to a PMT. A front-end beam loss monitor board was designed at TRIUMF to meet the strict requirements of the BLMs: a trip of the beam occurs on 100 nC in 100 ms of integrated beam loss, and the trip must occur in < 10 us. This contribution will report on the status of the 1 kW BLM system commissioning and will give an outlook as the power is increased to the full 300 kW.  
slides icon Slides TUAO04 [14.621 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUAO04  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUBO01 Screen materials for high precision measurements site, embedded, software, GUI 1
 
  • B. Walasek-Höhne, P. Forck
    GSI, Darmstadt, Germany
  • R. Ischebeck
    PSI, Villigen PSI, Switzerland
  • G. Kube
    DESY, Hamburg, Germany
 
  Funding: This project has received funding from the European Union’s Horizon 2020 programme under Grant Agreement No 730871.
Scintillation screens made of various inorganic materials are widely used for transverse beam profile diagnostics at all kinds of accelerators. The monitor principle is based on the particles’ energy loss and its conversion to visible light. The resulting light spot is a direct image of the two-dimensional beam distribution. For large beam sizes standard optical techniques can be applied, while for small beam sizes dedicated optical arrangements have to be used to prevent for image deformations. In the modern linac based light sources scintillator usage serves as an alternative way to overcome limitations related to coherent OTR emission. Radiation damages and intensity based saturation effects, in dependence of the screen material, have to be modelled. In this talk, an introduction to the scintillation mechanism in inorganic materials will be given including practical demands and limitations. An overview on actual applications at hadron and electron accelerators will be discussed as summary of the Joint ARIES-ADA Workshop on ’Scintillation Screens and Optical Technology for transverse Profile Measurements’ held in Kraków, Poland.
 
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TUBO02 FERMI-PSI Collaboration on Nano-Fabricated Wire-Scanners With Sub-Micrometer Resolution: Developments and Measurements. FEL, experiment, operation, emittance 243
 
  • G.L. Orlandi, S. Borrelli, Ch. David, E. Ferrari, V. Guzenko, B. Hermann, O. Huerzeler, R. Ischebeck, C. Lombosi, C. Ozkan Loch, E. Prat
    PSI, Villigen PSI, Switzerland
  • N. Cefarin, S. Dal Zilio, M. Lazzarino
    IOM-CNR, Trieste, Italy
  • M. Ferianis, G. Penco, M. Veronese
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  Wire-scanners with micrometer resolution are in operation at SwissFEL and FERMI for measurements of the beam emittance and for beam profile monitoring (*,**). In addition, both laboratories are developing and testing innovative nano-fabricated wire-scanners capable of providing sub-micrometer resolution and being quasi non-destructive to the beam. Nano-fabricated wire-scanners with a free-standing design (***) and a sub-micrometer resolution (****) has been already successfully tested. In the present work, innovative nano-fabricated wire-scanners joining both features of a free-standing design and sub-micrometer resolution are presented. Experimental tests carried out at SwissFEL demonstrated the capability of such innovative wire-scanner solutions to resolve transverse profiles of the electron beams with a size of 400-500 nm without incurring in any resolution limit constraint and with a minimal beam perturbation. An overview on current status and results along with future developments of these nano-fabricated wire-scanners are here presented.
(*)G.L.Orlandi et al. PRAB 19, 092802 (2016).
(**)M.Veronese et al.this Conference.
(***)M.Veronese et al.NIM-A 891, 32-36, (2018)
(****)S.Borrelli et al. Comm. Phys.-Nature, 1, 52 (2018).
 
slides icon Slides TUBO02 [10.551 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUBO02  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUBO04 Measuring the Beam Profile by Counting Ionization Electrons detector, simulation, proton, injection 252
 
  • H.S. Sandberg, W. Bertsche
    UMAN, Manchester, United Kingdom
  • D. Bodart, B. Dehning, S. Levasseur, H.S. Sandberg, G. Schneider, J.W. Storey, R. Veness
    CERN, Geneva, Switzerland
  • S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • K. Satou
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
 
  The principle of non-destructive beam profile measurement with rest gas ionization electrons has remained largely unchanged since the technique was first proposed in the late 1960’s. Ionization electrons (or ions) are transported by an electrostatic field onto an imaging detector, where the spatial distribution of detected electrons is a direct measure of the transverse beam profile. The detector typically consists of one or more Micro-Channel Plates (MCP’s) to amplify the signal, followed by either a phosphor screen and camera, or pickup electrodes. A long-standing problem is the ageing of the MCP’s, which limits the accuracy of the beam profile measurement. A new technique to detect ionization electrons has been developed at CERN, which uses a hybrid pixel detector to detect single ionisation electrons. This allows the application of counting statistics to the beam profile measurement. It will be shown that a meaningful beam profile can be extracted from only 100 electrons. Results from the new instrument will be presented, which demonstrate the ability to measure the beam profile of single bunches turn-by-turn, which offers new opportunities for beam diagnostic insights.  
slides icon Slides TUBO04 [2.199 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUBO04  
About • paper received ※ 03 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUCO02 Experimental Observation of Submillimeter Coherent Cherenkov Radiation at CLARA Facility radiation, experiment, detector, target 256
 
  • K.V. Fedorov, P. Karataev, A.N. Oleinik
    JAI, Egham, Surrey, United Kingdom
  • K.V. Fedorov, A. Potylitsyn, A. Potylitsyn
    TPU, Tomsk, Russia
  • P. Karataev
    Royal Holloway, University of London, Surrey, United Kingdom
  • A.N. Oleinik
    BelSU, Belgorod, Russia
  • T.H. Pacey, Y.M. Saveliev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • T.H. Pacey
    UMAN, Manchester, United Kingdom
  • Y.M. Saveliev
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Nowadays, the method of longitudinal beam profile diagnostic based on transition radiation (TR) spectrum is well studied [1] and is constantly being applied, while using of coherent Cherenkov radiation (CCR) is a modern task that opens up new possibilities in this area [2]. In current work we conducted experiments on CCR generation, observation and it further spectral analysis at 0.1-30 THz spectral range. All experimental work was at CLARA (beam area 1) facility (~50 MeV beam energy at up to 10 Hz pulse repetition rate with sub-ps bunch length). Inside of vacuum chamber we developed movable platform where both VCR and TR target were placed, which is allows us to observe both effects during one accelerator run. For spectral analysis we used Martin-Pupplet interferometer as it provides higher signal to noise ratio and allows us to perform instabilities normalisation. As a result we will demonstrate a selection of interferograms and spectrums (as well as reconstructed longitudinal beam profiles) for different machine setups and distances between charged particle beam and Cherenkov target. By using mathematical analysis it has been shown that CLARA bunch length was about 1.2 ps.  
slides icon Slides TUCO02 [22.952 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUCO02  
About • paper received ※ 03 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP001 KALYPSO: Linear Array Detector with Continuous Read-Out at MHz Frame Rates FEL, detector, radiation, laser 266
 
  • C. Gerth, B. Steffen
    DESY, Hamburg, Germany
  • M. Caselle, L. Rota
    KIT, Karlsruhe, Germany
  • D.R. Makowski, A. Mielczarek
    TUL-DMCS, Łódź, Poland
 
  The novel linear array detector KALYPSO has been developed for beam diagnostics based on 1-dimensional profile measurements at high-repetition rate free-electron lasers (FEL) and synchrotron radiation facilities. The current version of KALYPSO has 256 pixels with a maximum frame rate of 2.7~MHz. The detector board, which comprises the radiation sensor, analog signal amplification, and analog-to-digital signal conversion, has been designed as a mezzanine card that can be plugged onto application-specific carrier boards for data pre-processing and transmission. Either a Si or InGaAs sensor can be mounted for the detection of visible or near infrared radiation. Results obtained in several beam diagnostics applications at the European XFEL and FLASH are presented to demonstrate the powerful capabilities of the KALYPSO detector.
* The KAYLYPSO detector is a collaboration between the Karlsruhe Institute of Technology, Paul Scherrer Institut, Łódź University of Technology, and Deutsches-Elektronen Synchrotron.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP001  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUPP002 Direct-Sampling Coarse Bunch Arrival Time Monitor in the Free Electron Laser FLASH Based on the Fast Digitizer Implemented in the FMC VITA 57.1 Standard FEL, pick-up, timing, laser 270
 
  • J. Zink, M.K. Czwalinna, M. Fenner, S. Jabłoński, J. Marjanovic, H. Schlarb
    DESY, Hamburg, Germany
  • F. Gerfers
    Technische Universität Berlin, Berlin, Germany
 
  At the free-electron lasers FLASH and European-XFEL bunch arrival times are monitored with a high-accuracy electro-optical based data acquisition system (BAM). Due to only a couple of picoseconds time measurement range of this system, large timing changes might cause the monitor to fail. To remove any ambiguity and for health status monitoring a high-speed direct-sampling FPGA mezzanine card (FMC) and an analogue RF front-end was added. The circuitry has lower precision than the electro-optical based BAM, but it can determine bunch arrival time with respect to a reference signal over a large time range, i.e. of the order of 1 ms. After restarts or larger energy changes during operation, the electron bunch arrival time may have been changed by tens or even hundreds of picoseconds, which causes that the BAM is out of its operation range and needs to be recalibrated. With the solution developed, the BAM gets the coarse bunch timing from the digitizer and adjusts its optical delay lines accordingly. This allows for finding the operation point fast and automatically. Performance data of the fast direct-sampling digitizer FMC and first measurement data from FLASH will be presented.  
poster icon Poster TUPP002 [3.810 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP002  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP006 Transverse Emittance Measurement of a 2.5 MeV Proton Beam on LIPAc, IFMIF’s Prototype emittance, MMI, proton, rfq 283
 
  • J. Marroncle, P. Abbon, B. Bolzon, T. Chaminade, N. Chauvin, S. Chel, J.F. Denis, A. Gaget
    CEA-DRF-IRFU, France
  • T. Akagi, K. Kondo, M. Sugimoto
    QST, Aomori, Japan
  • L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent, F. Scantamburlo
    INFN/LNL, Legnaro (PD), Italy
  • P. Cara
    IFMIF/EVEDA, Rokkasho, Japan
  • H. Dzitko, D. Gex, A. Jokinen
    F4E, Germany
  • J.M. García, D. Jiménez-Rey, A. Ros, V. Villamayor
    CIEMAT, Madrid, Spain
  • A. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
 
  IFMIF (International Fusion Materials Irradiation Fa-cility) is an accelerator-driven neutron source aiming at testing fusion reactor materials. Under the Broader Ap-proach Agreement, a 125 mA / 9 MeV CW deuteron accelerator called LIPAc (Linear IFMIF Prototype Accel-erator) is currently under installation and commissioning at Rokkasho, Japan, to validate the IFMIF accelerator. During the beam commissioning at 5 MeV which started in June 2018, the horizontal and vertical transverse emit-tance of a 2.5 MeV proton beam have been measured downstream of the RFQ for different machine configura-tions. Such measurements were done with an emittance measurement unit composed of slits defining a beamlet of 200 µm width, then of steerers and finally of a SEM grids monitor. In this paper, the process and the system are first described. The secondary electron emission of SEM-Grid wires is then estimated based on measure-ments and results are close to the usual rule of thumb. Finally, emittance measurements are presented and comparisons with beam dynamics simulations show good agreement.  
poster icon Poster TUPP006 [1.974 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP006  
About • paper received ※ 02 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUPP007 Transverse Phase Space Scanner Developments at IPHC neutron, emittance, radiation, ECR 288
 
  • F.R. Osswald, T. Adam, P.G. Graehling, M. Heine, C. Maazouzi, E.K. Traykov
    IPHC, Strasbourg Cedex 2, France
 
  Emittance characterization of charged particle beams is a standard and important tool to assess the performances of a facility. Due to emittance growth, beam losses and space charge the measurement of the transverse phase space distributions of the charged particles is still an up-to-date issue even at low energy and for wide beams. It enables detailled characterization of particle position and incidence in addition to other diagnostics. It gives access to the particles distribution at the boarder, a region of lower density important for high power accelerators and high intensity radioactive beams as they request reduced losses and damages thus less contaminated parts and nuclear waste for a safe handling during maintenance. Transverse Phase Space Scanners are designed at IPHC and based on the Allison system. They are currently used on different injection channels of large facilities as SPIRAL 2 and FAIR and will be used in the future on the DC280/SHE facility at JINR. A review of the IPHC’s high resolution scanner design, development programme and future challenges are presented espacially for beam halo analysis and "loss less" beam transport lines.  
poster icon Poster TUPP007 [1.475 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP007  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP009 Determination of the Momentum Spread While Running in the ERL Mode at the S-DALINAC* linac, recirculation, quadrupole, radiation 295
 
  • F. Schließmann, M. Arnold, M. Dutine, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
 
  Funding: *Work supported by DFG through GRK 2128 and BMBF through grant No. 05H18RDRB2
The recirculating superconducting electron accelerator S-DALINAC [1] at TU Darmstadt is capable to run as a onefold or twofold Energy Recovery Linac (ERL) with a maximum energy of approximately 34 or 68 MeV in ERL mode, respectively. After the final acceleration in ERL mode, the momentum spread at the intended interaction point has to be determined. In order to investigate that momentum spread, a nondestructive measurement method is necessary. For this reason, it is planned to expand the beam horizontally in a section close to the interaction point by providing a well-defined horizontal dispersion. Using a wire scanner in this section for measuring the horizontal profile of the electron distribution, one can determine the momentum spread. The method of determining the momentum spread using the horizontal dispersion and the design of the wire scanner will be presented in this contribution.
[1] N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP009  
About • paper received ※ 03 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUPP011 Observation of Scintillators Charging Effects at the European XFEL FEL, diagnostics, operation, site 303
 
  • A.I. Novokshonov, B. Beutner, G. Kube
    DESY, Hamburg, Germany
  • S.A. Strokov
    TPU, Tomsk, Russia
 
  Scintillating screens are widely used for beam profile diagnostics at various kinds of particle accelerators. At modern linac based electron machines with ultrashort bunches as the European XFEL in Hamburg (Germany), scintillators help to overcome the limitation of standard OTR based monitors imposed by the emission of coherent radiation. The XFEL injector section is equipped with four off-axis screens allowing to perform online beam profile diagnostics, i.e. a single bunch out of a bunch train is kicked onto the screen and the profile is analyzed. However, during user operation a decrease of the SASE level was observed in cases that one of the of-axis screens was used. The observation is explained by charging of the scintillator screen: each deflected bunch hitting the screens causes ionization and charging of the screen. The scintillator as good insulator keeps the charge for some time such that the non-deflected part of the bunch-train feels their Coulomb force and experiences a kick, resulting in a drop of the SASE level. This report summarizes the observations at the European XFEL and introduces a simple model for quantification of this effect.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP011  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUPP012 Image of the Transverse Bunch Profile via COTR radiation, laser, target, detector 308
 
  • A. Potylitsyn, T. Gusvitskii, L.G. Sukhikh
    TPU, Tomsk, Russia
  • G. Kube, A.I. Novokshonov
    DESY, Hamburg, Germany
 
  Funding: This work was supported by the grant of the Russian Ministry of Science # 3/1903.2017.
Transverse beam profile diagnostics based on Optical Transition Radiation (OTR) is a routine technique at most modern electron linear accelerators (linacs) which is difficult to implement for FEL beams [*] and LWPA accelerators [**]. The reason is that a standard OTR beam profile monitor with a few micrometers space resolution cannot be used for measurements of ultrashort bunch profiles due to coherent effects in the OTR emission process [***]. We have developed an approach which allows calculating the propagation of coherent optical transition radiation (COTR) through a standard optical system consisting of a focusing lens and a spatial resolving detector placed in the image plane. Strict summation of the OTR fields emitted coherently by electrons inside the bunch and its focusing onto the detector plane allows obtaining a COTR image of the bunch profile. With the assumption of a Gaussian transverse bunch profile it is shown that the resulting image has a typical "ring" shape, characteristics of which are depended on the bunch transverse rms size and optical system parameters.
* E. Saldin, et al., "The Physics of Free Electron Lasers", Springer-Verlag, 2010.
** N. Bourgeois, et al., AIP Conf. Proc., 1507, 258 (2012).
*** H. Loos, R. Akre, et al., SLAC-PUB-13395 (2008).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP012  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP013 Slit-Based Slice Emittance Measurements Optimization at PITZ emittance, quadrupole, laser, cathode 313
 
  • R. Niemczyk, P. Boonpornprasert, Y. Chen, J.D. Good, M. Groß, H. Huck, I.I. Isaev, C. Koschitzki, M. Krasilnikov, S. Lal, X. Li, O. Lishilin, G. Loisch, D. Melkumyan, A. Oppelt, H.J. Qian, H. Shaker, G. Shu, F. Stephan, G. Vashchenko
    DESY Zeuthen, Zeuthen, Germany
  • W. Hillert
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
 
  At the Photo Injector Test Facility at DESY in Zeuthen (PITZ) high-brightness electron sources are optimized for use at the X-ray free-electron lasers FLASH and European XFEL. Transverse projected emittance measurements are carried out by a single-slit scan technique in order to suppress space charge effects at an energy of ~20 MeV. Previous slice emittance measurements, which employed the emittance measurement in conjunction with a transverse deflecting structure, suffer from limited time resolution and low signal-to-noise ratio (SNR) due to a long drift space from the mask to the observation screen. Recent experimental studies at PITZ show improvement of the temporal resolution and SNR by utilizing quadrupole magnets between the mask and the screen. The measurement setup is described and first results are shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP013  
About • paper received ※ 26 August 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP014 New Combined Function Wire Scanner-Screen Station for the High Resolution Transverse Profile Measurements at FERMI FEL, vacuum, operation, laser 317
 
  • M. Veronese, A. Abrami, M. Bossi, M. Ferianis, S. Grulja, G. Penco, M. Tudor
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  We present the upgrade of the transverse profile diagnostics at the end of the FERMI Linac with a new high resolution instrumentation with the aim of improving the accuracy of the measurement of the twiss parameters and of the emittance. A scintillating screen, has been adopted instead of OTR screen due to known COTR issues. We used the same COTR suppression geometry that we had already implemented on our intra undulator screens and YAG:Ce as scintillating material. Screen based transverse profile diagnostics provide single shot measurements with a typical resolution of the order of tens of microns mainly due to refraction effects, geometry and other physical material properties. To extend the resolution to the micron level needed in case of low charge operation, we have equipped the same vacuum chamber with a wire scanner housing 10 micron tungsten wires. This paper describes the design and the first operational experience with the new device and discusses advantages as well as limitations.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP014  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP016 Beam Profile Monitors for the CNAO Experimental Line detector, experiment, proton, controls 323
 
  • C. Viviani, G.M.A. Calvi, L. Lanzavecchia, M. Manzini, A. Parravicini, E. Rojatti
    CNAO Foundation, Milan, Italy
 
  The CNAO (Centro Nazionale di Adroterapia Oncologica) Foundation is the first Italian center for deep hadrontherapy. Since 2011, more than 2000 patients have been treated using Protons and Carbon ions. During the last 3 years an experimental line for research purposes has been built. The experimental line is equipped with three Scintillating Fibers with Photodiode array (SFP) detectors. The SFP is a profile and position monitor, whose sensitive part is made up of two harps of scintillating fibers. Each fiber is readout by a cell of a photodiode array. The SFP has been developed from the Scintillating Fibers Harp (SFH) detector, the monitor presently installed along the CNAO extraction lines. The passage to the SFP results in a significant advantage in terms of cost, dimension, acquisition rate speed and flexibility. On 19th May 2019 the first beam was extracted in the CNAO experimental room and first in line beam measurement was performed with the SFP. The present work describes the SFP detectors, their achieved performances and the results obtained by means of the most recent beam measurements, performed during experimental line commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP016  
About • paper received ※ 03 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUPP017 Thermal Performance of Diamond SR Extraction Mirrors for SuperKEKB extraction, MMI, optics, synchrotron 327
 
  • J.W. Flanagan, M. Arinaga, H. Fukuma, H. Ikeda, G. Mitsuka, Y. Suetsugu
    KEK, Ibaraki, Japan
  • E. Mulyani
    BATAN, Yogyakarta, Indonesia
  • E. Mulyani
    Sokendai, Ibaraki, Japan
 
  The SuperKEKB accelerator is a high-current, low-emittance upgrade to the KEKB double ring collider. The beryllium extraction mirrors used for the synchrotron radiation (SR) monitors at KEKB suffered from heat distortion due to incident SR, leading to systematic changes in magnification with beam current, and necessitating continuous monitoring and compensation of such distortions in order to correctly measure the beam sizes.* To minimize such mirror distortions, quasi-monocrystalline CVD diamond mirrors have been designed and installed at SuperKEKB.** Diamond has a very high heat conductance and a low thermal expansion coefficient. With such mirrors it is hoped to reduce the beam current-dependent magnification to the level of a few percent at SuperKEKB. Preliminary measurements of mirror distortion during SuperKEKB commissioning show very promising results with regard to thermal performance, though full beam currents have not yet been stored in the SuperKEKB rings. Measurements of the thermal deformation of the diamond mirrors will be presented in this paper, along with a description of the design of the mirrors and their mounts, and issues encountered during commissioning.
*M. Arinaga et al., NIM, A499, p. 100 (2003).
**J.W. Flanagan et al., "Diamond mirrors for the SuperKEKB synchrotron radiation monitors," Proc. IBIC2012, Tsukuba, Japan p. 515 (2012).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP017  
About • paper received ※ 09 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP019 Experimental Tests of Screen Materials for High-Precision Transverse Beam-Size Measurements at the SuperKEKB Injector Linac linac, experiment, quadrupole, emittance 335
 
  • F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada
    KEK, Ibaraki, Japan
 
  The SuperKEKB injector linac is required to deliver low-emittance electron and positron beams. Wire scanners are employed to measure Twiss parameters and to adjust beam optics conditions. Screen monitors also play important roles for single-shot measurements. However, the beam size became more than 10-times smaller compared with that of the KEKB injection. Beam tests have been performed in order to evaluate materials for high-precision transverse beam-size measurements at the injector. The main purpose of the beam tests is to quantitatively investigate the saturation effect of each screen material for generating the scintillation light, which is strongly depending on the beam-charge density. Several scintillating screen materials including YAG:Ce, LYSO:Ce, BGO and aluminum ceramic have been tested with high energy and high charge-density electron beams. The results are compared with that obtained by the OTR measurement. The saturation of the luminescence was confirmed for all crystals and evaluated in the charge density of 0.5-1.5 nC/mm2. The cause of the saturation and the effect to the measurement are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP019  
About • paper received ※ 07 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP020 Development of a Gated IPM System for J-PARC MR detector, operation, GUI, impedance 338
 
  • K. Satou
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
 
  In the Main Ring (MR) of Japan Proton Accelerator Research Complex (J-PARC), a residual-gas ionization profile monitor (IPM) is used to measure bunched beam profiles. After injection, the beam widths of the first ~20 bunched beams are analysed to correct the Quadruple oscillation. While only a few dozen profiles are required for this correction, the present IPM auto-matically measures all bunched beams, more than 2·106 bunches from injection to the extraction, because the present IPM operates using DC. This system is unde-sirable due to the limited lifetime of the Micro Channel Plate (MCP) detector; the more particles the MCP senses, the more it loses gain flatness and thus lifetime. To improve this situation, a gated IPM system has been developed, in which the High Voltage (HV) is operated in pulse mode. Results of performance analysis of a new HV power supply, improvement of the electrodes, and particle-tracking simulation considering the space-charge-electric field of the bunched beam are de-scribed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP020  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUPP023 Two-dimensional Beam Profile Monitor for Alpha Emitter target, injection, dipole, beam-transport 350
 
  • K.S. Tanaka, K. Harada, M. Itoh, H. Kawamura, A. Terakawa, A. Uchiyama
    CYRIC, Sendai, Japan
  • T. Hayamizu, H. Nagahama, N. Ozawa, Y. Sakemi
    CNS, Saitama, Japan
 
  We developed two-dimensional beam profile monitors for alpha-emitters along with other larger number of ions to measure the permanent electric dipole moment of the electron using francium atoms at CYRIC in Tohoku university. Francium is produced by the fusion reaction between the oxygen beam from the cyclotron accelerator and gold target, and a far larger number of other ions such as fold or potassium are also emitted from the target. Thus it was difficult to measure the beam profile of francium hidden by these ions. We installed two beam profile monitor consisted of the micro-channel plate and phosphor screen. If we stop the beam after the beam injection to the monitor in sufficient time, we can only observe the fluorescence of the alpha particle emitted by francium atoms on the surface of the plates. By using this monitoring system, we improved the beam transport efficiency by several times and improved beam purity of francium with Wien filter.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP023  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUPP026 Diagnostic Beamlines at the Solaris Storage Ring diagnostics, storage-ring, emittance, synchrotron 361
 
  • A. Kisiel, S. Cabala, A.M. Marendziak, M. Ptaszkiewicz, A.I. Wawrzyniak, I.S. Zadworny, Z. Zbylut
    Solaris National Synchrotron Radiation Centre, Jagiellonian University, Kraków, Poland
 
  Precise measurement and control of the particle beam emittance is a very important input to characterize the performance of any accelerator/SRS. Beam characterizations at the SOLARIS National Synchrotron Radiation Centre are provided by two independent diagnostic beamlines called the X-ray synchrotron radiation (PINHOLE) and optical synchrotron radiation (LUMOS) beamlines, respectively. The PINHOLE beamline depicts the electron beam by analyzing the emitted X-rays. However this method is predominantly applied to the middle and high energy storage rings. At Solaris storage ring with the nominal energy of 1.5 GeV and critical photon beam energy of c.a. 2 keV, the design of the beamline was modified to provide sufficient X-ray photon flux for proper imaging. Second diagnostic beamline LUMOS will be installed and commissioned in next few months. Issues discussed include the general design philosophy, choice of instrumentation, limits to resolution, and actual performance.
*e-mail: adriana.wawrzyniak@uj.edu.pl
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP026  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP028 Double-Wire Vibrating Wire Monitor (DW-VWM) for Beam Halo Monitoring in High-intensity Accelerators vacuum, experiment, laser, operation 368
 
  • D.H. Kwak, M. Chung
    UNIST, Ulsan, Republic of Korea
  • S.G. Arutunian, A.V. Margaryan
    ANSL, Yerevan, Armenia
  • G.S. Harutyunyan, E.G. Lazareva
    YSU, Yerevan, Armenia
 
  Funding: This work was partly supported by the National Research Foundation of Korea (Grants No. 2017M1A7A1A02016413).
Double-Wire Vibrating Wire Monitor (DW-VWM) has been designed and manufactured to monitor the beam halo in high-intensity accelerators. Compared with the previous VWM, we increase the ratio between the aperture and wire length by using strong 5 mm x 5 mm Samarium-Cobalt magnets. In addition, we install two stainless steel vibrating wires on the same frame. The first wire is placed in the beam halo region for measurements, and the second wire, which is separated from the beam by a screen, is used to subtract background signal caused by ambient temperature shifts. The new electronics of the DW-VWM consist of two main boards: auto-generation unit which is placed near the VWM, and the frequency measurement unit which is placed in the control room (100 m distance operation was tested). Typical frequency of the VWM (at start tension about 0.7 of tensile strength) is about 8000 Hz. The temperature sensitivity is about 110 Hz/K with 0.2 mK Hz resolution. The VWM was tested in vacuum tank and the frequency corresponding to each vacuum level was analyzed. The process of oscillation excitation at different levels of vacuum was also investigated.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP028  
About • paper received ※ 04 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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TUPP030 Analysis of Heavy Ion Irradiation Field Nonuniformity Using Track Detectors during Electronic Components Testing radiation, heavy-ion, detector, experiment 376
 
  • A.S. Bychkov, P.A. Chubunov, A.S. Konyukhov, A.A. Pavlov
    ISDE, Moscow, Russia
 
  Determining the applicability of electronic components in spacecrafts involves conducting the tests using heavy ions. The Branch of URSC - ISDE and FLNR of JINR have created and operate the only in Russia test facilities based on the FLNR JINR accelerators allowing for heavy ion irradiation over a large area up to 200x200 mm. During simultaneous irradiation of several electronic components with heavy ions, it is necessary to ensure the device under test (DUT) location within the area of minimal nonuniformity. This problem is being solved by pretest determination of the irradiation field nonuniformity for each type of ion (Ne, Ar, Kr, Xe, Bi) and nonuniformity validation every 12 hours. Fluence is determined by a metrologically certified method using track detectors. In order to visualize the irradiation field nonuniformity, additional experiments were carried out with the irradiation of track detec-tors covering the entire irradiation area for each ion species. Based on the data obtained, a map of nonuniformity was plotted, which allows us to conclude that nonuniformity does not exceed 10% in the most frequently used areas of the irradiation field (100x150 mm) during SEE testing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP030  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP032 J-PARC Test of ESS Beam on Target Diagnostics Prototypes Aperture Monitor and GRID target, proton, HOM, radiation 382
 
  • C.A. Thomas, J. Etxeberria, H. Kocevar, J.P.S. Martins, T.J. Shea
    ESS, Lund, Sweden
  • A.J. Johansson, M. Törmänen
    Lund University, Lund, Sweden
  • S.I. Meigo, M. Ooi
    JAEA/J-PARC, Tokai-mura, Japan
  • H. Niu, B. Zhang
    IMP/CAS, Lanzhou, People’s Republic of China
 
  The ESS high power beam will be delivered to the spallation target with high degree of control. To this end, we have designed a suite of instruments which provide measurement of the beam characteristics in a drift space a few meters from the target. Two of these instruments, the APTerure Monitor (APTM) and the GRID are presented. The APTM is designed to measure the fraction of beam going through the defined aperture; its time acquisition ranges from intra-pulse at µs sampling rate to many pulses over seconds. The GRID measures the projected horizontal and vertical profiles, sampling the pulse at 1MHz. A prototype of these two instruments has been designed and installed in the 3NBT dump line of J-PARC. They are designed to test functionality of these instruments in a similar environment as ESS. The 3NBT Dump line at J-PARC presents such an environment. In the second part of the paper we report the results and the measurements performed to test the prototypes. Before concluding we will discuss the results and propose improvements to the instruments final design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP032  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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TUPP034 Analysis of Quadrupolar Measurements for Beam Size Determination in the LHC emittance, electronics, pick-up, synchrotron 392
 
  • D. Alves, M. Gąsior, T. Lefèvre
    CERN, Meyrin, Switzerland
 
  Due to limitations with non-invasive beam size diagnostics in the LHC, particularly during the energy ramp, there has been an interest to explore quadrupolar-based measurements for estimating the transverse beam size, and hence determining the transverse emittance. This technique is especially attractive as it is completely passive and can use the existing beam position instrumentation. In this work, we perform an analysis of this method and present recent measurements taken during energy ramps. Quadrupolar-based measurements are compared with wire-scanner measurements and a calibration strategy is proposed to overcome present limitations.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP034  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP037 Studies of the Time Structure of Ionisation Beam Profile Measurements in the ISIS Extracted Proton Beamline simulation, space-charge, proton, software 407
 
  • C.C. Wilcox, W.A. Frank, A. Pertica, R.E. Williamson
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Ionisation Profile Monitors (IPMs) are used at the ISIS neutron and muon source to perform non-destructive transverse beam profile measurements. An in-house particle tracking code, combined with 3D CST modelling of the electric fields within the monitors, has been used to improve understanding of the various error sources within the IPMs, and shows close agreement with profile measurements in the synchrotron. To allow for detailed benchmarking studies, an IPM has been installed in Extracted Proton Beamline 1 (EPB1), enabling comparison with secondary emission (SEM) grid measurements. However, the IPM measurements taken in EPB1 show increased levels of profile broadening at operational beam intensities, which are not reproduced by SEM measurements or simulation. To investigate these differences, studies of the time structure of measured profiles are being performed. This paper details the development of new, high-speed multichannel data acquisition electronics, required to perform these studies. Resulting measurements are discussed, along with an analysis of the data’s time structure and a comparison with that predicted by the IPM code.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP037  
About • paper received ※ 04 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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TUPP039 Horizontal and Vertical Emittance Measurements of the Advanced Photon Source Booster Synchrotron Beam at High Charge emittance, synchrotron, quadrupole, booster 415
 
  • K.P. Wootton, W. Berg, J.R. Calvey, K.C. Harkay, A.H. Lumpkin, A. Xiao, B.X. Yang, C. Yao
    ANL, Lemont, Illinois, USA
 
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
In order to maximise the injection efficiency from the booster synchrotron into the proposed Advanced Photon Source Upgrade storage ring, beam-based optimisation of the booster electron optical lattice is anticipated. In the present work, we present non-destructive beam size and emittance measurements using the booster synchrotron light monitor and destructive quadrupole scan emittance measurements in the booster to storage ring transport line. Destructive measurements are performed with a 0.1 mm thickness Cerium-doped Yttrium Aluminium Garnet screen. In order to characterise performance, both the beam energy at extraction (5, 6 and 7 GeV) and the bunch charge are varied.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP039  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUPP042 Turn-by-Turn Synchrotron Radiation Transverse Profile Monitor for IOTA optics, experiment, radiation, lattice 428
 
  • N. Kuklev, Y.K. Kim
    University of Chicago, Chicago, Illinois, USA
 
  Funding: Work supported by National Science Foundation award PHY-1549132, the Center for Bright Beams. Fermi Research Alliance operates Fermilab under Contract DE-AC02-07CH11359 with the US Dept. of Energy.
The Integrable Optics Test Accelerator is a research electron and proton storage ring recently commissioned at Fermilab. A key part of its beam diagnostics suite are synchrotron radiation monitors, used for measuring transverse beam profile, position, and intensity. So far, this system has used only visible light cameras, which are optimal for orbit measurements but do not provide turn-by-turn temporal resolution needed for beam dynamics analysis. Current electrostatic BPM system, while capable of turn-by-turn acquisition, will be pushed to its limits of accuracy and linearity by the requirements of planned nonlinear integrable optics experiments, and furthermore does not provide transverse profile data. To address these drawbacks, we present in this paper the design of a turn-by-turn BPM system based on a multi-anode photomultiplier detector. Extensive simulations are shown, combining both particle and optics tracking. A potential hardware and readout architecture is described. Statistical and systematic errors are explored. We conclude by outlining the prototype testing plans for run 2 in the fall of 2019, and other future work.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP042  
About • paper received ※ 11 September 2019       paper accepted ※ 12 September 2019       issue date ※ 10 November 2019  
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TUPP047 Ionization Profile Monitor Design and Experiments in HIRFL-CSR experiment, simulation, heavy-ion, storage-ring 441
 
  • H.M. Xie, Z. Du, K. Gu, X.J. Hu, L. Jing, Z.X. Li, L.J. Mao, Y. Wei, J.X. Wu, Y. Zhang, G. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
 
  Funding: Supported by the National Natural Science Foundation of China (Nos. 11805250
To meet the needs of real-time profile monitoring, injection match optimization, transverse cooling mechanism research in Cooling Storage Ring of Heavy Ion Research Facility of Lanzhou (HIRFL-CSR), and the profile measurement of future intense facilities like High Intensity Heavy-ion Accelerator Facility (HIAF) and China Initiative Accelerator Driven System (CiADS) in Huizhou China, some IPM research and experiments has been proceed since 2013. In 2016, the first IPM was developed with MCPs, phosphor screen and camera acquisition system for vertical profile monitoring in HIRFL-CSRm. Then another horizontal IPM with new framework and less field distortion was also deployed in CSRm at 2018 summer. Besides, two more IPMs will be installed in HIRFL-CSRe during next summer maintenance. This paper mainly presents the horizontal IPM design concerns, HV settings influence, some experiment anomalies, as well as experiments for transverse electron cooling and normal operation mode orbit variation at HIRFL-CSR in December 2018.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP047  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEAO01 Technological Review of Beam Position Button Design and Manufacture resonance, FEL, electronics, SRF 445
 
  • A.F.D. Morgan
    DLS, Oxfordshire, United Kingdom
 
  A workshop in May 2019, hosted by DLS (UK), reviewed both the design and the manufacturing aspects of beam position monitor (BPM) pick-up buttons with an integrated UHV feedthrough and coaxial connector. The UHV feedthrough technology (e.g. ceramic brazing vs glass-sealing), the limits on mechanical tolerances, reproducibility and material choices for high reliability were examined by more than 20 diagnostics users of these devices and a number of reputed manufacturers. Calibration techniques and tools and methods for inspection & testing were also assessed. This talk will present the outcome & conclusions of this workshop and identify challenges and opportunities for future BPM manufacture.  
slides icon Slides WEAO01 [1.824 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEAO01  
About • paper received ※ 05 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEAO02 Pile-Up Effect of Cold Button BPMs in the European XFEL Accelerator resonance, cavity, FEL, electronics 450
 
  • D. Lipka, B. Lorbeer
    DESY, Hamburg, Germany
 
  The European XFEL facility is in operation with a maximum of 2700 bunches in one train. The highest bunch repetition rate is 4.5 MHz; this corresponds to a minimum time separation of 222 ns. The measurement of the beam properties for each bunch in a train is required. Therefore the beam position monitor (BPM) system needs to separate the signals from each bunch. All BPM types (button, re-entrant and cavity) fulfill this requirement except a few button BPMs installed inside of the cold accelerator module, where Pile-Up from the train can be observed. To identify the cause of this effect we measured the S-parameters during a shutdown of the accelerator, compared it with a similar BPM at the FLASH accelerator but located in a warm section and finally measured the spectrum of the button signal during beam operation. As a result, resonances were found at about 2.46 GHz with relatively high quality factor that remains within the frequency range accepted by the electronics.  
slides icon Slides WEAO02 [5.621 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEAO02  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEBO02 MicroTCA.4 at Sirius and a Closer Look into the Community hardware, electronics, LLRF, controls 459
 
  • D.O. Tavares, G.B.M. Bruno, S.R. Marques, L.M. Russo, H.A. Silva
    LNLS, Campinas, Brazil
 
  More and more facilities have been adopting MicroTCA.4 as the standard for new electronics. Despite the advertised advantages in terms of system manageability, high availability, backplane performance and supply of high quality COTS modules by industry, the standard still lacks a greater acceptance in the accelerators community. This paper reports on the deployment of MicroTCA.4 systems at Sirius light source, which comprised the development and manufacturing of several open hardware modules, development of a generic gateware/software framework and re-implementation of MMC IPMI firmware as an open source project. A special focus will be given to the difficulties found, unforeseen expansions of the system and general architectural aspects. Based on this experience and on a survey carried out among other MicroTCA.4 adopters, the perceived strengths and weaknesses of the standard will be discussed and a tentative outlook on how it could be evolved to better suit the accelerators community will be presented.  
slides icon Slides WEBO02 [34.322 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEBO02  
About • paper received ※ 05 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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WEBO03 Development of MTCA.4-Based BPM Electronics for SPring-8 Upgrade electronics, FPGA, LLRF, closed-orbit 469
 
  • H. Maesaka, T. Fukui
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  • H. Dewa, T. Fujita, M. Masaki, C. Saji, S. Takano
    JASRI/SPring-8, Hyogo-ken, Japan
 
  We have developed a new button-BPM readout electronics based on the MTCA.4 standard for the low-emittance upgrade of SPring-8 [*]. Requirements for the BPM system are a high single-pass BPM resolution of better than 100 µm for a 100 pC injected bunch to achieve first-turn steering in the commissioning of the upgraded ring and a highly stable COD BPM within 5 µm error for 1 month to maintain the optical axis of brilliant x-rays for users [**]. We designed an rf front-end rear transition module (RTM) having band-pass filters, low-noise amplifiers, step attenuators, and calibration tone generators. The rf signal is detected by a 16-bit 370 MSPS high-speed digitizer advanced mezzanine card (AMC) developed for the new low-level rf system of SPring-8 [***]. The firmware of the FPGA on the digitizer AMC was newly developed to implement various functions of the BPM system. We evaluated the readout system at a laboratory and then tested at the present SPring-8 storage ring with a prototype BPM head for the SPring-8 upgrade. We confirmed that the new readout system satisfies the requirements for the single-pass BPM resolution and the COD BPM stability.
* SPring-8-II Conceptual Design Report, http://rsc.riken.jp/pdf/SPring-8-II.pdf
** H. Maesaka et al., Proc. IBIC’18, paper TUOC04.
*** T. Ohshima et al., Proc. IPAC’17, paper THPAB117.
 
slides icon Slides WEBO03 [3.340 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEBO03  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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WEBO04 Enhancement of the S-DALINAC Control System with Machine Learning Methods network, target, controls, linac 473
 
  • J.H. Hanten, M. Arnold, J. Birkhan, C. Caliari, N. Pietralla, M. Steinhorst
    TU Darmstadt, Darmstadt, Germany
 
  Funding: *Work supported by DFG through GRK 2128
For the EPICS-based control system of the superconducting Darmstadt electron linear accelerator S-DALINAC**, supporting infrastructures based on machine learning are currently developed. The most important support for the operators is to assist the beam setup and controlling with reinforcement learning using artificial neural networks. A particle accelerator has a very large parameter space with often hidden relationships between them. Therefore neural networks are a suited instrument to use for approximating the needed value function which represents the value of a certain action in a certain state. Different neural network structures and their training with reinforcement learning are currently tested with simulations. Also there are different candidates for the reinforcement learning algorithms such as Deep-Q-Networks (DQN) or Deep-Deterministic-Policy-Gradient (DDPG). In this contribution the concept and first results will be presented.
**N. Pietralla, Nuclear Physics News, Vol. 28, No.2, 4 (2018)
 
slides icon Slides WEBO04 [2.073 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEBO04  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WECO02 Towards an Adaptive Orbit-Response-Matrix Model for Twiss-Parameter Diagnostics and Orbit Correction at Delta betatron, storage-ring, feedback, software 477
 
  • S. Koetter, T. Weis
    DELTA, Dortmund, Germany
 
  At DELTA, a 1.5-GeV electron storage ring operated by the TU Dortmund University, preliminary tests of an adaptive orbit-response-matrix model were conducted. Closed orbit perturbations corrected by the slow orbit feedback can be buffered and used to update a fit of the bilinear-exponential model with dispersion (BE+d model). This model is a representation of the orbit-response matrix depending on the beta functions, the betatron phases and the tunes in both planes. This work introduces a new fitting recipe to obtain good estimates of the aforementioned quantities and evaluates a BE+d-model represented orbit-response matrix for orbit correction. Numerical studies are shown along with measurement results.  
slides icon Slides WECO02 [0.657 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO02  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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WEPP001 Study and Characterization of SPIRAL2 BPMs simulation, linac, MEBT, electronics 491
 
  • V. Langlois, T. Andre, C. Jamet, G. Ledu, P. Legallois, S. Leloir, F. Lepoittevin, M. Lewitowicz, S. Loret, C. Potier de courcy
    GANIL, Caen, France
 
  The SPIRAL2 facility currently under commissioning at GANIL in France will deliver high-intensity up to 20MeV/n and 5mA light and heavy ions beams. SPIRAL2 beams are accelerated by a Radio Frequency Quadrupole (RFQ) and a LINAC fitted with 20 supraconducting cavities. A tuning of the SPIRAL2 LINAC relies mainly on Pick-up Beam Profile Monitors (BPM). 20 BPM are mounted inside the warm sections between superconducting cavities. They serve to measure a beam transverse position to center the beam, a phase to tune cavities and an ellipticity to adjust beam optics along the LINAC. The phase and ellipticity measurements require high acquisition accuracy of the BPM signals. This paper deals with an analytical study and CST code simulations of the BPM performed in order to compute correction coefficients for the ellipticity measurements. The results of calculations were compared with experimental ones obtained with two BPMs located on a ’diagnostic plate’ after the RFQ . Finally, the BPM acquisition chain was carefully characterized to identify its uncertainties and to ensure that it meets initial specifications.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP001  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP002 Development of a Low-beta BPM for MYRTE Project quadrupole, electronics, site, linac 496
 
  • M. Ben Abdillah, P. Blache, F. Fournier, H. Kraft
    IPN, Orsay, France
 
  MYRTE (MYRRHA Research Transmutation Endeavour) performs research to support the development of the MYRRHA (Multi-Purpose Hybrid Research Reactor for High-Tech Applications) research facility, which aims to demonstrate the feasibility of high-level nuclear waste transmutation at industrial scale. MYRRHA Facility aims to accelerate 4mA proton beam up to 100 MeV. The accurate tuning of LINAC is essential for the operation of MYRRHA and requires measurement of the beam transverse position and shape , the phase of the beam with respect to the radiofrequency voltage with the help of Beam Position Monitor (BPM) system. MYRTE aims to qualify beam operation at 1.5MeV. Two BPMs were realized for MYRTE operation. This paper addresses the design, realization, and calibration of these two BPMs and their associated electronics. The characterization of the beam shape is performed by means of a test bench allowing a position mapping with a resolution of 0.02mm.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP002  
About • paper received ※ 27 August 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP005 BPM Resolution Studies at PETRA III brilliance, electronics, pick-up, optics 509
 
  • G. Kube, J. Neugebauer, F. Schmidt-Föhre
    DESY, Hamburg, Germany
 
  In order to measure the noise level of a BPM system from beam generated orbit data, the correlated beam jitter has to be removed from the position signals. There exist different ways to extract the BPM noise, as the "three-BPM" correlation method or the model-independent principal components analysis (PCA). Both methods will shortly be reviewed. Based on a PCA, the resolution of the PETRA III Libera Brilliance based BPM system was measured. The results will be presented together with first measurements in view of an updated BPM system for the future PETRA IV project at DESY.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP005  
About • paper received ※ 02 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP006 Operational Performance of New Detection Electronics for Stripline-Type Beam Position Monitors at the SuperKEKB Injector Linac linac, quadrupole, emittance, operation 514
 
  • F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada
    KEK, Ibaraki, Japan
 
  SuperKEKB injector linac delivers four different beam modes modulated pulse by pulse at 50 Hz, which have 100-times different beam charges, and a pulse may contain two bunches only 96-ns apart. Required low-emittance beams for SuperKEKB rings would need precise beam orbit controls in order to suppress the transverse wakefield in the accelerating structures. A new detection electronics with a wide dynamic range of 40 dB with a high resolution based on a 180-MHz narrow-band detection technique for stripline-type beam position monitors (BPMs) has been developed for the SuperKEKB injector linac. While such measurement condition is challenging, a position resolution of 3 micrometer in one standard deviation was successfully achieved with beam-based tests. The self-calibration system is also installed in order to compensate gain drifts for each input channel with an accuracy down to 0.1%, by using test pulses going through stripline heads between 50-Hz beam pulses. The design concept of the new detection electronics is described in detail, as well as operational performance of synchronized measurement with 100 BPMs for injection beams to four electron/positron storage rings.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP006  
About • paper received ※ 09 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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WEPP013 Beam Commissioning of Beam Position and Phase Monitors for LIPAc pick-up, electronics, MMI, MEBT 527
 
  • I. Podadera, D. Gavela, A. Guirao, D. Jiménez-Rey, L.M. Martínez, J. Mollá, C. Oliver, R. Varela, V. Villamayor
    CIEMAT, Madrid, Spain
  • T. Akagi, K. Kondo, Y. Shimosaki, T. Shinya, M. Sugimoto
    QST, Aomori, Japan
  • L. Bellan, M. Comunian, F. Grespan, F. Scantamburlo
    INFN/LNL, Legnaro (PD), Italy
  • P. Cara
    IFMIF/EVEDA, Rokkasho, Japan
  • Y. Carin, H. Dzitko, D. Gex, A. Jokinen, I.M. Moya
    F4E, Germany
  • A. Marqueta
    Fusion for Energy, Garching, Germany
  • A. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
 
  Funding: Work partially supported by the Spanish Ministry of Science and Innovation under project AIC-A-2011-0654 and FIS2013-40860-R
The LIPAc accelerator is 9-MeV, 125-mA CW deuteron accelerator that aims to validate the technology that will be used in the future IFMIF accelerator (40-MeV, 2 x 125-mA CW). LIPAc is presently under beam commissioning of the second acceleration stage (injector and Radio Frequency Quadrupole) at 5 MeV. In this stage two types of BPM’s are used: four stripline-type to control the transverse position and phase at the Medium Energy Beam Transport line (MEBT), and three other stripline-type mainly for the precise measurements of the mean beam energy at the Diagnostics Plate. All the BPM’s have been successfully tested and served to increase the duty cycle and the average power of the beam delivered down to the beam dump. Moreover, the BPM’s were key devices for the transverse beam positioning and longitudinal beam tuning and validation of the RFQ and re-buncher cavities at the MEBT. In this contribution, an overview of the beam position monitors system installation and characterization in the facility will be reported. First tests of the system with the upgraded acquisition electronics for the next phase will be also presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP013  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP015 ESS Beam Position and Phase Monitor System electronics, linac, FPGA, MEBT 536
 
  • R.A. Baron, H. Hassanzadegan, A. Jansson, H. Kocevar, K.E. Rosengren, T.J. Shea
    ESS, Lund, Sweden
  • I. Bustinduy, S. Varnasseri
    ESS Bilbao, Zamudio, Spain
  • F. Grespan, M. Poggi
    INFN/LNL, Legnaro (PD), Italy
  • T. Gräber
    DESY Zeuthen, Zeuthen, Germany
  • D. Lipka, S. Vilcins
    DESY, Hamburg, Germany
 
  The European Spallation Source (ESS) is a neutron facility under construction in Lund, Sweden, and established as an European collaboration between different member countries. The machine is a 2 GeV proton LINAC with a nominal beam current of 62.5 mA, 2.86 ms of pulse length and a bunch repetition rate of 352 MHz. The Beam Position and Phase Monitors (BPM) at ESS were designed to satisfy the specifications for the different beam modes, which span from 5 µs pulse length and 6.3 mA beam until the nominal beam condition. The system is designed for standard beam position measurements for beam trajectory correction and for beam phase measurements for cavity phase tuning, imposing restrictions on the sensor design and electronics architecture. Approximately a hundred BPM’s were manufactured and are being installed by partners in collaboration with ESS. The BPM system comprises a MicroTCA.4 electronics based in COTS AMC and RTM modules with custom FPGA firmware implementation and a custom Front-End electronics. In this work, the system architecture, implementation, performance, and test results are presented and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP015  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP017 Current Monitor and Beam Position Monitor Performance for High Charge Operation of the Advanced Photon Source Particle Accumulator Ring injection, electronics, extraction, linac 545
 
  • A.R. Brill, J.R. Calvey, K.C. Harkay, R.T. Keane, N. Sereno, U. Wienands, K.P. Wootton, C. Yao
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
A design choice for the Advanced Photon Source Upgrade to inject into the storage ring using bunch swap out rather than off-axis accumulation means that the Advanced Photon Source injectors are required to accelerate much higher electron bunch charge than originally designed. In the present work, we outline upgrades to the current monitor and beam position monitor diagnostics for the Particle Accumulator Ring to accommodate bunch charges of 1-20 nC. Through experiments, we compare and characterize the system responses over the range of bunch charge.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP017  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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WEPP018 THz Generation by Optical Rectification for a Novel Shot to Shot Synchronization System Between Electron Bunches and Femtosecond Laser Pulses in a Plasma Wakefield Accelerator laser, plasma, wakefield, optics 548
 
  • S. Mattiello, A. Penirschke
    THM, Friedberg, Germany
  • H. Schlarb
    DESY, Hamburg, Germany
 
  Funding: The work of S. Mattiello is supported by the German Federal Ministry of Education and Research (BMBF) within the Project ’ MAKE-PWA.
We investigate the influence of the optical properties and of the theoretical description of the THz generation on the conversion efficiency of the generation of short THz pulses. The application is a feedback-system for SINBAD with a time resolution of less than 1 fs for the synchronization of the electron bunch and of the plasma wake field in a laser driven plasma particle accelerator*. Here stable THz pulses are generated by optical rectification of a fraction of the plasma generating high energy laser pulses in a nonlinear lithium niobate crystal. Then the generated THz pulses will energy modulate the electron bunches shot to shot before the plasma to achieve the required time resolution. In this contribution we compare different approximations for the modeling of the generation dynamics using second order or first order equations as well as considering pump depletion effects. Additionally, the dependence of the efficiency of the THz generation on the choice of the dielectric function has been investigated.
*The feedback system will be tested at the Accelerator R&D facility SINBAD (Short Innovative Bunches and Accelerators at DESY).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP018  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP019 Concept of a Novel High-Bandwidth Arrival Time Monitor for Very Low Charges as a Part of the All-Optical Synchronization System at ELBE pick-up, laser, FEL, FEM 553
 
  • A. Penirschke
    THM, Friedberg, Germany
  • W. Ackermann
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M.K. Czwalinna, H. Schlarb
    DESY, Hamburg, Germany
  • M. Kuntzsch
    HZDR, Dresden, Germany
 
  Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05K19RO1.
Numerous advanced applications of X-ray free-electron lasers require pulse durations and time resolutions in the order of only a few femtoseconds or better. The generation of these pulses to be used in time-resolved experiments require synchronization techniques that can simultaneously lock all necessary components to a precision in the range of a few fs only. The CW operated electron accelerator ELBE at the Helmholtzzentrum Dresden Rossendorf uses a all-optical synchronization system to ensure a timing stability on the few 10 fs scale. ELBE requires a minimum beam pipe diameter of 43mm that limits the achievable output voltage of the pickup structure to drive the attached electro-optical modulator. This contribution presents a concept for a novel high-bandwidth arrival time monitor with sufficient output signal for the attached EOMs for very low charges as a part of the all-optical synchronization system at ELBE.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP019  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP020 First results on Femtosecond Level Photocathode Laser Synchronization at the SINBAD Facility laser, timing, controls, linac 557
 
  • M. Titberidze, M. Felber, T. Kozak, T. Lamb, J. Müller, H. Schlarb, S. Schulz, C. Sydlo, F. Zummack
    DESY, Hamburg, Germany
 
  SINBAD, the "short-innovative bunches and accelerators at DESY" is an accelerator research and development facility which will host various experiments. SINBAD-ARES linac is a conventional S-band linear accelerator which will be capable of producing ultra-short electron bunches with duration of few femtoseconds and energy of up to 100 MeV. In order to fully utilize the potential of ultra-short electron bunches while probing the novel acceleration techniques (e.g. external injection in LWFA), it is crucial to achieve femtosecond level synchronization between photocathode laser and RF source driving the RF gun of the ARES linac. In this paper we present the first results on the synchronization of the near-infrared photocathode laser to the RF source with the residual timing jitter performance of ~10 fs rms. These results were obtained using a conventional laser-to-RF synchronization setup employing heterodyne detection of an RF signal generated by impinging the laser pulses to a fast photodetector. In addition, we describe an advanced laser-to-RF phase detection scheme as a future upgrade; promising even lower timing jitter and most importantly the long-term timing drift stability.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP020  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP026 Electron Bunch Compression Monitors for Short Bunches - Commissioning Results from SwissFEL FEL, linac, detector, radiation 571
 
  • F. Frei, R. Ischebeck
    PSI, Villigen PSI, Switzerland
 
  In SwissFEL, by using three magnetic chicanes, 3ps long electron bunches can by compressed by a factor of more than 100 down to a few fs in order to generate ultra short X-ray pulses. In order to meet the envisaged beam performance, noninvasive longitudinal diagnostic after each compression stage is essential. These bunch compression monitors measure relative bunch length changes on a shot-to-shot basis by detecting coherent edge, synchrotron or diffraction radiation emitted by the electron bunches. While after the first two magnetic chicanes, a wide spectral part is integrated on a single broadband detector, an infrared spectrometer installed after the third magnetic chicane is providing more detailed information. Here, we will mainly report on commissioning results of the third bunch compression monitor for electron bunches of a few fs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP026  
About • paper received ※ 03 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP028 Laser Compton Backscattering Source for Beam Diagnostics at the S-DALINAC photon, laser, linac, scattering 575
 
  • M.G. Meier, M. Arnold, J. Enders, N. Pietralla, M. Roth
    TU Darmstadt, Darmstadt, Germany
  • V. Bagnoud
    GSI, Darmstadt, Germany
 
  Funding: Supported in part through the state of Hesse (LOEWE research cluster Nuclear Photonics) and DFG through GRK 2128 ’AccelencE’.
The Superconducting DArmstadt electron LINear ACcelerator S-DALINAC is a thrice-recirculating linac* providing electron beams with energies up to 130 MeV and beam currents up to 20 ’A for a variety of nuclear physics experiments**. It has been operated as Germany’s first energy-recovery linac (ERL) in 2017***. The electron beam is produced either in a thermionic gun or a DC photo-gun using GaAs as cathode material****. A new project foresees to use the S-DALINAC for Laser Compton Backscattering (LCB) to produce a monochromatic high-energy photon beam for nuclear photonics applications in photonuclear reactions and atomics physics experiments. Besides this LCB will be used as an additional diagnostic tool for determining electron beam energy and the energy spread at the third recirculation of the S-DALINAC, when the maximum reachable energy at this point (98.8 MeV) yields a scattered photon energy of 179.7 keV. An overview over the desired laser system for LCB at the S-DALINAC will be given, and simulations for the layout and the estimated output of the Compton-backscattering light source will be presented.
*M. Arnold, Diss., TU Darmstadt (2017)
**N. Pietralla, Nucl. Phys. News 28(2), 4(2018)
***M. Arnold et al., Proc. IPAC’18(4859), 9(2018)
****Y. Poltoratska et al., J.Phys.: Conf. S. 298, 012002(2011)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP028  
About • paper received ※ 04 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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WEPP029 Virtual Pepper-Pot Technique for 4D Phase Space Measurements emittance, gun, quadrupole, coupling 580
 
  • G.Z. Georgiev, M. Krasilnikov
    DESY Zeuthen, Zeuthen, Germany
 
  A novel method for 4-dimensional transverse beam phase space measurement is proposed at the Photo Injector Test facility at DESY in Zeuthen (PITZ) for ongoing beam coupling studies. This method is called Virtual Pepper-Pot (VPP), because key principles of the pepper-pot mask scheme are applied. The latter approach is of limited use in high-brightness photo injectors, because of technical reasons. At PITZ a slit scan method instead is the standard tool for reconstruction of horizontal and vertical phase spaces. The VPP method extends the slit scan technique with a special post-processing. The 4D transverse phase space is reconstructed from a pepper-pot like pattern that is generated by crossing each measured horizontal slit beamlet with all measured vertical slit beamlets. All elements of the 4D transverse beam matrix are calculated and applied to obtain the 4D transverse emittance, 4D kinematic beam invariant and coupling factors. The proposed technique has been applied to experimental data from the PITZ photo injector optimization for 0.5 nC bunch charge. Details of the VPP technique and results of its application will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP029  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP036 Application of Thermoelectric Oscillations in a Lithium Niobate Single Crystal for Particle Generation experiment, ECR, vacuum, radiation 614
 
  • K.V. Fedorov, P. Karataev
    JAI, Egham, Surrey, United Kingdom
  • K.V. Fedorov
    TPU, Tomsk, Russia
  • O.O. Ivashchuk, A.A. Klenin, A.S. Kubankin, A.N. Oleinik
    BelSU, Belgorod, Russia
  • A.V. Shchagin
    NSC/KIPT, Kharkov, Ukraine
 
  Single crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) can be used to accelerate electrons and positive ions to energies of the order of 100 keV and generate X-rays and fast neutrons, as well as to control beams of charged particles. However, this way of particles acceleration and generation is not widely used yet due to an unstable particle flux caused by electric breakdowns or crystal impurities leading to temporal discontinuity of pyroelectric current. A sinusoidal mode of the temperature change demonstrated stable oscillations of the pyroelectric current on the polar surface with typical frequency being of the order of 1-50 mHz and the amplitude being about 1-10 nA for samples with area of several cm2. In vacuum it leads to generation of high electric field, which oscillates with the same frequency. Estimated amplitude of electric field is order of 105 V/cm. The possibilities of using such mode of temperature change to obtain a quasi-stable X-ray and electron source are considered. The fundamental properties and further prospects for the application of thermoelectric oscillations are also discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP036  
About • paper received ※ 03 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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WEPP037 First Measurements of Cherenkov-Diffraction Radiation at Diamond Light Source radiation, photon, diagnostics, experiment 619
 
  • D.M. Harryman, P. Karataev
    JAI, Egham, Surrey, United Kingdom
  • M. Apollonio, L. Bobb
    DLS, Oxfordshire, United Kingdom
  • M. Bergamaschi, R. Kieffer, M. Krupa, T. Lefèvre, S. Mazzoni
    CERN, Geneva, Switzerland
  • A. Potylitsyn
    TPU, Tomsk, Russia
 
  Cherenkov Diffraction Radiation (ChDR), appearing when a charged particle moves in the vicinity of a dielectric medium with speed faster than the speed of light inside the medium, is a phenomenon that can be exploited for a range of non-invasive beam diagnostics. By using dielectric radiators that emit photons when in proximity to charged particle beams, one can design devices to measure beam properties such as position, direction and size. The Booster To Storage-ring (BTS) test stand at Diamond Light Source provides a 3 GeV electron beam for diagnostics research. A new vessel string has been installed to allow the BTS test stand to be used to study ChDR diagnostics applicable for both hadron and electron accelerators. This paper will discuss the commissioning of the BTS test stand, as well as exploring the initial results obtained from the ChDR monitor.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP037  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP039 Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers laser, diagnostics, radiation, experiment 628
 
  • A.H. Lumpkin
    Fermilab, Batavia, Illinois, USA
  • D.W. Rule
    Private Address, Silver Spring, USA
 
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The need for single-shot diagnostics of the periodic longitudinal density modulation of relativistic electrons at the resonant wavelength (microbunching) in a free-electron laser (FEL) or at broadband visible wavelengths as in a laser-driven plasma accelerator (LPA) has been reaffirmed. In the self-amplified spontaneous emission (SASE) FEL case, statistical fluctuations in the microbunching occur in the startup-from-noise process. In the LPA, the plasma itself is chaotic and varies shot to shot. Fortunately, we have shown that coherent optical transition radiation (COTR) techniques, can assess beam size, divergence, spectral evolution, and z-dependent gain (100, 000) of microbunched electrons in a past SASE FEL experiment at 530 nm*. Recently, the application to LPAs has been demonstrated with single-shot near-field (NF) and far-field (FF) COTR imaging done at the exit of an LPA for the first time**. In this case few-micron beam sizes and extensive fringes due to sub-mrad divergences were measured based on point-spread-function effects and an analytical model for COTR interferometry, respectively. A proposed diagnostics application at 266 nm to pre-bunched beams is also described.
*A.H. Lumpkin et al., Phys. Rev. Lett. 88, No.23, 234801 (2002).
**A.H. Lumpkin, M. LaBerge, D.W. Rule, et al., Proceedings of AAC18, (IEEE), 2019.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP039  
About • paper received ※ 10 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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WEPP040 Optimization of Antiproton Capture for Antihydrogen Creation in the ALPHA Experiment proton, antiproton, simulation, experiment 633
 
  • S.S. Fabbri, W. Bertsche
    UMAN, Manchester, United Kingdom
 
  At the ALPHA Experiment at CERN, thin foils of material are used to slow down and trap antiprotons in a Penning trap, where they can be used for antihydrogen creation and measurements. Historically, over 99% of antiprotons are lost during the capture process as a result of the 5.3 MeV initial kinetic energy of the beam delivered by the Antiproton Decelerator. This places a limit early on in the achievable number of antihydrogen. ELENA is a new storage ring coming online which will lower this initial kinetic energy of the beam to 100 keV, requiring experiments to update their infrastructure. We present Monte Carlo and particle tracking simulation results for the optimization of the new degrading foil material, thickness, and location in the ALPHA catching Penning trap. From these results, we expect an upper capture efficiency of roughly 50 %. We further propose techniques for manipulating, detecting and extracting on the anticipated larger-numbered antiproton plasmas. These methods and associated hardware developments will allow performing antiproton experiments with significantly higher efficiency in ALPHA and other similar antiproton-based experiments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP040  
About • paper received ※ 04 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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WEPP042 Measurement of the Second Moments of Transverse Beam Distribution with Solenoid Scan solenoid, emittance, experiment, focusing 638
 
  • I. Pinayev
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Measurement of the dependence of the beam size on profile monitor vs. strength of a focusing element is widely used for measurement of the beam parameters. Such measurements are mostly used for the separate planes and assumption that beam satisfied Gaussian distribution. In many linear accelerators the transverse beam dynamics is coupled between planes and distribution is far from the Gaussian. We developed measurement technique of the second moments of beam distribution which does not rely on any assumptions. The theory and experimental results are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP042  
About • paper received ※ 03 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP043 Time-of-flight Technique for Matching Energies in Electron Cooler cavity, hadron, booster, gun 641
 
  • I. Pinayev, R.L. Hulsart, K. Mernick, R.J. Michnoff, Z. Sorrell
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Electron cooler with bunched electron beam is being commissioned at the Relativistic Heavy Ion Collider at BNL. For the cooler to operate the energies of the hadron and electron beams should be matched with high accuracy. We have developed time-of-flight technique based on the phase measurement of the beam induced signal in the beam position monitors separated by a drift. We present the method description and experimental results.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP043  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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WEPP044 Beam Position Monitoring System for Fermilab’s Muon Campus electronics, pick-up, proton, MMI 644
 
  • N. Patel, J.S. Diamond, N. Eddy, C.R. McClure, P.S. Prieto, D.C. Voy
    Fermilab, Batavia, Illinois, USA
 
  A Beam Position Monitor (BPM) system has been designed for Fermilab Muon Campus. The BPM system measures Turn-by-Turn orbits as well as Closed Orbits (average of multiple turns). While in the early commissioning phase of this program, preliminary measurements have been made using these BPMs. This paper discusses the design and implementation of these BPMs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP044  
About • paper received ※ 09 September 2019       paper accepted ※ 12 September 2019       issue date ※ 10 November 2019  
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WEPP046 Technology and First Beam Tests of the New CERN-SPS Beam Position System electronics, pick-up, controls, detector 653
 
  • M. Wendt, M. Barros Marin, A. Boccardi, T.B. Bogey, I. Degl’Innocenti, A. Topaloudis
    CERN, Meyrin, Switzerland
 
  The CERN Super Proton Synchrotron (SPS) uses 215 beam position monitors (BPMs) to observe the beam orbit when accelerating protons or ions on a fast ramp cycle to beam energies of up to 450 GeV/c. In the frame of the CERN LHC Injector Upgrade (LIU) initiative the aged, and diffi- cult to maintain homodyne-receiver based BPM read-out system is currently being upgraded with A Logarithmic Po- sition System ’ ALPS. As the name indicates, this new BPM electronics builds upon the experience at CERN with using logarithmic detector amplifiers for beam position processing, and is well suited to cover the large range of beam intensities accelerated in the SPS. The system will use radiation toler- ant electronics located in close proximity to the split-plane or stripline beam position monitor with GB/s optical data transmission to the processing electronics located on the surface. Technical details of the analog and digital signal processing, the data transmission using optical fibers, cal- ibration and testing, as well as first beam tests on a set of ALPS prototypes are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP046  
About • paper received ※ 06 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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THAO01 Cherenkov Diffraction Radiation as a tool for beam diagnostics radiation, photon, experiment, diagnostics 658
 
  • T. Lefèvre, D. Alves, M. Bergamaschi, A. Curcio, O.R. Jones, R. Kieffer, S. Mazzoni, N. Mounet, A. Schlogelhofer, E. Senes
    CERN, Meyrin, Switzerland
  • M. Apollonio, L. Bobb
    DLS, Oxfordshire, United Kingdom
  • A. Aryshev, N. Terunuma
    KEK, Ibaraki, Japan
  • M.G. Billing, Y.L. Bordlemay Padilla, J.V. Conway, J.P. Shanks
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • V.V. Bleko, S.Yu. Gogolev, A.S. Konkov, J.S. Markova, A. Potylitsyn, D.A. Shkitov
    TPU, Tomsk, Russia
  • K.V. Fedorov, D.M. Harryman, P. Karataev, K. Lekomtsev
    JAI, Egham, Surrey, United Kingdom
  • J. Gardelle
    CEA, LE BARP cedex, France
  • K. Łasocha
    Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
 
  During the last three years, the emission of Cherenkov Diffraction Radiation (ChDR), appearing when a relativistic charged particle moves in the vicinity of a dielectric medium, has been investigated with the aim of providing non-invasive beam diagnostics. ChDR has very interesting properties, with a large number of photons emitted in a narrow and well-defined solid angle, providing excellent conditions for detection with very little background. This contribution will present a collection of recent beam measurements performed at several facilities such as the Cornell Electron Storage Ring, the Advanced Test Facility 2 at KEK, the Diamond light source in the UK and the CLEAR test facility at CERN. Those results, complemented with simulations, suggest that the use of both incoherent and coherent emission of Cherenkov diffraction radiation could open up new beam instrumentation possibilities for relativistic charged particle beams.  
slides icon Slides THAO01 [10.658 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO01  
About • paper received ※ 09 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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THAO04 Transverse Emittance Measurement using Undulator High Harmonics for Diffraction Limited Storage Rings undulator, emittance, radiation, simulation 673
 
  • K.P. Wootton, J.L. McChesney, F.M. Rodolakis, N. Sereno, B.X. Yang
    ANL, Lemont, Illinois, USA
 
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
A particular challenge for diagnostics in diffraction limited storage ring light sources is the measurement of electron beam transverse emittances. In the present work, we present measurements and simulations of vertical electron beam emittance using high harmonics from an electromagnetic undulator in the present Advanced Photon Source storage ring. Based on these results, using simulation we motivate an undulator-based horizontal and vertical transverse emittance monitor for diffraction limited storage rings, using the Advanced Photon Source Upgrade as an example.
 
slides icon Slides THAO04 [2.655 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO04  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)