Keyword: storage-ring
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MOAO03 Overview on the Diagnostics for EBS-ESRF SRF, feedback, radiation, diagnostics 9
 
  • L. Torino, N. Benoist, F. Ewald, E. Plouviez, J. Poitou, B. Roche, K.B. Scheidt, F. Taoutaou, F. Uberto
    ESRF, Grenoble, France
 
  On December 2018 the ESRF was shut down and the 28 years old storage ring was entirely dismantled in the following months. A new storage ring, the Extremely Brilliant Source (EBS), that had been pre-assembled in 2017 and 2018, is presently being installed and the commissioning will start in December 2019. EBS will achieve a much reduced horizontal emittance, from 4 nm to 150 pm, and will also provide the X-ray users with a more coherent synchrotron radiation beam. In this paper, we present an overview of the diagnostics systems for this new storage ring.  
slides icon Slides MOAO03 [40.660 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOAO03  
About • paper received ※ 03 September 2019       paper accepted ※ 07 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, software, injection, electron 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, electron, timing, operation 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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MOPP017 New Beam Loss Monitor System at SOLEIL detector, electron, 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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MOPP045 MAX IV Operations - Diagnostic Tools and Lessons Learned operation, synchrotron, status, injection 210
 
  • B. Meirose, V. Abelin, B.E. Bolling, M. Brandin, R. Høier, A. Johansson, P. Lilja, J.S. Lundquist, S. Molloy, F. Persson, J.E. Petersson, R. Svärd
    MAX IV Laboratory, Lund University, Lund, Sweden
 
  In this contribution, I present some of the new beam diagnostic and monitoring tools developed by the MAX IV Operations Group. In particular, new BPM and accelerator tunes visualization tools and other simple but useful applications we have developed, such as our RF System Monitor, are presented. I also briefly share our experience with the development of audible alarms, which help operators monitor various parameters of the machine and explain how the implementation of all these tools have improved accelerator operations at MAX IV.  
poster icon Poster MOPP045 [2.879 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP045  
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, emittance, synchrotron, electron 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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TUPP038 Spatial Resolution of an X-ray Pinhole Camera using a Multi-layer Monochromator photon, emittance, synchrotron, simulation 412
 
  • L. Bobb, G. Rehm
    DLS, Oxfordshire, United Kingdom
 
  X-ray pinhole cameras are widely used for beam emittance monitoring at synchrotron light sources. Due to the reduction in beam emittance expected for the many fourth generation machine upgrades, the spatial resolution of the pinhole camera must be improved accordingly. It is well known that there are many contributions to the point spread function. However, a significant contribution arises from diffraction by the pinhole aperture. Given that diffraction is dependent on the spectral distribution of the incident synchrotron radiation, the spatial resolution can be improved by using a monochromatic beam. For optimal performance, the photon energy should be matched to the pinhole aperture size. Here we investigate the spatial resolution of the pinhole camera as a function of photon energy using a multi-layer monochromator.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP038  
About • paper received ※ 04 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP047 Ionization Profile Monitor Design and Experiments in HIRFL-CSR electron, experiment, simulation, heavy-ion 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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WECO02 Towards an Adaptive Orbit-Response-Matrix Model for Twiss-Parameter Diagnostics and Orbit Correction at Delta betatron, electron, 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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WEPP003 A new button-type beam position monitor for BESSY II and BESSY VSR impedance, vacuum, operation, synchrotron 500
 
  • J.G. Hwang, V. Dürr, F. Falkenstern, M. Ries, A. Schälicke, G. Schiwietz, D. Wolk
    HZB, Berlin, Germany
 
  Funding: This work was supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association.
The future BESSY VSR system involves more than one order-of-magnitude differences in the total charge of adjacent short and long bunches within the bunch train. Thus, any signal ringing beyond a nanosecond in time will cause a misreading of beam position and current, specifically for low bunch charges. This calls for improved performance for the bunch-selective operation of the beam-position-monitor (BPM) system. We report on the corresponding design and fabrication of a new button BPM with advanced features, such as impedance matching inside the button as well as optimization of insulator material, button size, and position, for reduced crosstalk between buttons.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP003  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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THAO02 Towards Full Silicon 4H-SiC Based X-Ray Beam Monitoring feedback, synchrotron, monitoring, experiment 663
 
  • M. Camarda, M. Birri, M. Carulla, D. Grolimund, B. Meyer, C. Pradervand
    PSI, Villigen PSI, Switzerland
  • U. Grossner, S.M. Nida, A. Tsibizov, T. Ziemann
    ETH, Zurich, Switzerland
 
  In this work, we present extensive theoretical and experimental results of novel Silicon Carbide x-ray sensors for beam position monitoring (XBPM). Until recently, diamond, was considered the material-of-choice for continuous monitoring of hard (>6keV) x-ray beams at synchrotron light sources. Diamond XBPM are now commercially available as single crystal* and polycrystalline** sensors. However, in a recently published paper***, we have shown that Silicon Carbide is superior to both diamond crystal types in several critical aspects. Specifically, we found superior electrical characteristics (sensor dynamics, signal uniformity, signal strength) and superior optical properties (full device transparency, device active area, signal strength) when compared to commercial polycrystalline and single crystal diamond, respectively. We also succeeded in the ’industrialization’ of the SiC fabrication process, allowing for the simultaneous realization of several (>40) sensors in up to 4’ SiC wafers, with high yields. More recently we have also analyzed the fluorescence of SiC sensors as compared to YAG ones, finding that SiC can also be used for hybrid position/shape monitoring schema.
* CIVIDEC. AT, SYDORTECHNOLOGIES. COM
** DECTRIS. COM
*** S. Nida, et. al. Silicon carbide X-ray beam position monitors for synchrotron applications J. Synchrotron Rad. 26, 28-35 (2019)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO02  
About • paper received ※ 11 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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