Author: Shea, T.J.
Paper Title Page
MOBO04 Characterization and First Beam Loss Detection with One ESS-nBLM System Detector 28
 
  • L. Segui, H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, M. Combet, M. Kebbiri, Ph. Legou, O. Maillard, A. Marcel, T. Papaevangelou
    CEA-IRFU, Gif-sur-Yvette, France
  • A. Dano-Daguze, D. Desforge, F. Gougnaud, T.J. Joannem, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, V. Nadot, G. Tsiledakis
    CEA-DRF-IRFU, France
  • I. Dolenc Kittelmann, T.J. Shea
    ESS, Lund, Sweden
 
  The monitoring of losses is crucial in any accelerator. In the new high intensity hadron facilities even low energy beam can damage or activate the materials so the detection of small losses in this region is very important. A new type of neutron beam loss monitor has been developed specifically targeting this region, where only neutrons and photons can be produced and where typical BLM, based on charged particle detection, could not be appropriate because of the photon background due to the RF cavities. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and with little sensitivity to photons. Development of the detectors presented here has been done to fulfil the requirements of ESS and they will be part of the ESS-BI systems. The detector has been presented in previous editions of the conference. Here we focus on the neutron/gamma rejection with the final FEE and in the first operation of one of the modules in a beam during the commissioning of LINAC4 (CERN) with the detection of provoked losses and their clear separation from RF gammas. The ESS-nBLM system is presented in this conference in a separate contribution.  
slides icon Slides MOBO04 [7.609 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOBO04  
About • paper received ※ 05 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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MOPP022 Neutron Sensitive Beam Loss Monitoring System for the ESS Linac 130
 
  • I. Dolenc Kittelmann, F.S. Alves, E.C. Bergman, C.S. Derrez, V. Grishin, K.E. Rosengren, T.J. Shea
    ESS, Lund, Sweden
  • Q. Bertrand, T.J. Joannem, Ph. Legou, Y. Mariette, V. Nadot, T. Papaevangelou, L. Segui
    CEA-IRFU, Gif-sur-Yvette, France
  • W. Cichalewski, G.W. Jabłoński, W. Jałmużna, R. Kiełbik
    TUL-DMCS, Łódź, Poland
 
  The European Spallation Source, currently under construction in Lund, Sweden, will be a neutron source based on partly superconducting linac, accelerating protons to 2GeV with a peak current of 62.5mA, ultimately delivering a 5MW beam to a rotating tungsten target. For a successful tuning and operation of a linac, a Beam Loss Monitoring (BLM) system is required. The system is designed to protect the machine from beam-induced damage and unnecessary activation of the components. This contribution focuses on one of the BLM systems to be deployed at the ESS linac, namely the neutron sensitive BLM (nBLM). Recently, test of the nBLM data acquisition chain including the detector has been performed at LINAC4, at CERN. The test represents first evaluation of the system prototype in realistic environment. Results of the test will be presented together with an overview of the ESS nBLM system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP022  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOPP023 Ionisation Chamber Based Beam Loss Monitoring System for the ESS Linac 135
 
  • I. Dolenc Kittelmann, F.S. Alves, E.C. Bergman, C.S. Derrez, T.J. Grandsaert, V. Grishin, T.J. Shea
    ESS, Lund, Sweden
  • W. Cichalewski, G.W. Jabłoński, W. Jałmużna, R. Kiełbik
    TUL-DMCS, Łódź, Poland
 
  The European Spallation Source, currently under construction in Lund, Sweden, will be a neutron source based on partly superconducting linac, accelerating protons to 2GeV with a peak current of 62.5mA, ultimately delivering a 5MW beam to a rotating tungsten target. One of the most critical elements for the protection of an accelerator is its Beam Loss Monitoring (BLM) system. The system is designed to protect the machine from beam-induced damage and unnecessary activation of the components. This contribution focuses on one of the BLM systems to be deployed at the ESS linac, namely the Ionisation Chamber based BLM (ICBLM). Several test campaigns have been performed at various facilities. Results of these tests will be presented here together with an overview of the ESS ICBLM system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP023  
About • paper received ※ 04 September 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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MOPP044 Status of the Faraday Cups for the ESS linac 206
 
  • E.M. Donegani, C.S. Derrez, T.J. Grandsaert, T.J. Shea
    ESS, Lund, Sweden
  • I. Bustinduy, A. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
 
  The European Spallation Source (ESS) will be a 5 MW pulsed neutron source, relying on a 2 GeV linac delivering 2.86 ms long pulses with 14 Hz repetition rate. During the commissioning and the tuning phases of the ESS linac, four Faraday Cups (FC) serve as beam dumps and provide an absolute measurement of the proton beam current. This contribution summarizes the challenges in the design and production of all the FCs mainly requiring: - Thermo-mechanical analysis to keep heat load and mechanical stress below the mechanical limits; - Inclusion of an electron repeller to prevent the escape of secondary charged particles from the cup that would limit the accuracy of the current measurements; - Monte Carlo simulations to compute material activation, dose at contact and corresponding necessary shielding; - Design of high-resolution detection circuits for low current to fulfill the requirements on bandwidth, gain and noise. In addition, the performance of the LEBT FC during the commissioning of the ion source and LEBT is reported. The LEBT FC system is under continuous improvement and serves as benchmark for the protection from unwanted operation, and in case of actuator or cooling faults.  
poster icon Poster MOPP044 [1.121 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP044  
About • paper received ※ 04 September 2019       paper accepted ※ 08 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 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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WECO04 Commissioning of the Non-invasive Profile Monitors for the ESS LEBT 487
 
  • C.A. Thomas, J. Etxeberria, S. Haghtalab, H. Kocevar, N. Milas, R. Miyamoto, T.J. Shea, R. Tarkeshian
    ESS, Lund, Sweden
 
  In the Low Energy Beam Transport (LEBT) of the European Spallation Source (ESS) Linac, a specific Non-invasive Profile Monitor (NPM) has been designed to primarily monitor beam position monitor with 100 µm accuracy, and in addition enable beam profile and size measurement. We present the first measurement results using NPM during the commissioning of the LEBT. The measurement results conclude the beam position as well as the angle of the beam. The performance of the measurement is discussed and compared to the required accuracy for the position measurement. In addition, the profile of the beam along the propagation axis is reported, as measured for part or the full pulse transported in the LEBT. The fidelity of the reported profile will be discussed as function of the system sensitivity and image signal to noise ratio.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO04  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP014 A Report on Developments of the BCM and BPM Pickups of the ESS MEBT 532
 
  • S. Varnasseri, I. Bustinduy, A. Conde, J. Martin, A. Ortega, I. Rueda, A. Zugazaga
    ESS Bilbao, Derio, Spain
  • R.A. Baron, H. Hassanzadegan, T.J. Shea
    ESS, Lund, Sweden
 
  In the framework of the Spanish In-Kind Contribution (IKC) to the construction of the European Spallation Source (ESS-ERIC), ESS-Bilbao is in charge of providing some key systems for the accelerator. In this paper, design and pre-delivery measurements of non-interceptive devices of MEBT (e.g Beam Position Monitor pick-ups, shielded ACCT and FCT) are reported. Overall there are 8 BPMs distributed in MEBT, which 7 of them are used for the beam position and phase measurements and one BPM is used for the fast timing characterization. The latter is used mainly to characterize the partially chopped bunches and rise/fall time of the Beam Chopper. Furthermore there are two ACCTs, one just attached to the beam dump and the other at the last raft of the MEBT. One FCT combined with the second ACCT gives the complementary information on the fast timing characteristics of the beam pulses.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP014  
About • paper received ※ 02 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP015 ESS Beam Position and Phase Monitor System 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, LEIOA, 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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