Keyword: kicker
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MOP16 Time Resolved Dynamics of Transverse Resonance Island Buckets at SPEAR3 experiment, timing, resonance, lattice 62
  • K. Tian, W.J. Corbett, J. Kim, J.A. Safranek
    SLAC, Menlo Park, California, USA
  The Transverse Resonance Island Buckets have been studied at SPEAR3 as an option for timing experiment mode operation of this third generation synchrotron radiation facility. In this mode, with proper optics setting, the electron beam is populated to island orbits with the excitation from a kicker. In this paper, we will report the experimental observation of the beam dynamics with turn by turn beam position monitors and a fast gated camera. The results are also compared with tracking simulations.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP16  
About • Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 22 September 2022
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TU2C2 The Diamond Beam Loss Monitoring System at CERN LHC and SPS detector, injection, extraction, instrumentation 202
  • E. Calvo Giraldo, E. Effinger, M. Gonzalez Berges, J. Martínez Samblas, S. Morales Vigo, B. Salvachúa, C. Zamantzas
    CERN, Meyrin, Switzerland
  • J. Kral
    CTUP/FNSPE, Prague, Czech Republic
  The Large Hadron Collider (LHC) and the Super Proton Synchrotron (SPS) accelerators are equipped with 17 pCVD diamond based Beam Loss detectors at strategical locations where their nanosecond resolution can provide insights into the loss mechanisms and complement the information of the standard ionization chamber type detectors. They are used at the injection and extraction lines of the LHC and SPS, to analyse the injection or extraction efficiency, and to verify the timing alignment of other elements like kicker magnets. They are used at the betatron collimation region and are being also explored as detectors to analyse slow extractions. The acquisition chain was fully renovated during the second LHC long shutdown period (from December 2018 to July 2022) to provide higher resolution measurements, real-time data processing and data reduction at the source as well as to integrate seamlessly to the controls infrastructure. This paper presents the new hardware platform, the different acquisition modes implemented, the system capabilities and initial results obtained during the commissioning and operation at the beginning of the LHC’s Run 3.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TU2C2  
About • Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 14 September 2022
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WE2I3 Adaptive Feedforward Control of Closed Orbit Distortion Caused by Fast Helicity-Switching Undulators undulator, controls, experiment, storage-ring 374
  • M. Masaki, H. Dewa, T. Fujita, H. Maesaka, K. Soutome, T. Sugimoto, S. Takano, M.T. Takeuchi, T. Watanabe
    JASRI, Hyogo, Japan
  • T. Fukui, H. Maesaka
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  • K. Kubota
    SES, Hyogo-pref., Japan
  • K. Soutome, T. Sugimoto, S. Takano, H. Tanaka, T. Watanabe
    RIKEN SPring-8 Center, Hyogo, Japan
  We developed a new correction algorithm for closed orbit distortion (COD) based on adaptive feedforward control (AFC). The AFC system effectively works for the suppression of the fast COD due to known error sources with repetitive patterns such as helicity-switching undulators. The scheme aims to counteract error sources by feedforward correctors at the position or in the vicinity of error sources so that a potential risk of unwanted local orbit bumps, which is known to exist for the global orbit feedback, can be eliminated in a reliable and accurate manner. This option is especially advantageous when an error source causes an angular distortion of photon beams such as a fast orbit distortion near undulators. Thus, the AFC provides a complementary capability to a so-called fast global orbit feedback (FOFB) for coming next-generation light sources where ultimate light source stability is essentially demanded. In this talk, introduction to the AFC, its theoretical aspect and advantages, the system overview, the experimental results for the effects of AFC will be presented.
M. Masaki, et al., J. Synchrotron Rad. 28, 1758-1768 (2021).
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2I3  
About • Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 09 October 2022
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WE2C4 RF System-on-Chip for Multi-Bunch and Filling-Pattern Feedbacks feedback, hardware, storage-ring, controls 379
  • P.H. Baeta Neves Diniz Santos, B. Keil, G. Marinkovic
    PSI, Villigen PSI, Switzerland
  RF Systems-on-Chip (RFSoCs) are FPGAs with CPUs, multi-GSample/s ADCs and DACs and other components on the same chip. We have evaluated the use of RFSoCs for low-latency multibunch (bunch-by-bunch) feedback and filling pattern (single bunch charge) measurement systems for the Swiss Light Source (SLS) storage ring. First results obtained with an RFSoC evaluation board will be presented.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2C4  
About • Received ※ 10 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022
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WEP36 Conceptual Design of the Transverse Multi-Bunch Feedback for the Synchrotron Radiation Source PETRA IV feedback, damping, detector, synchrotron 488
  • S. Jabłoński, H.T. Duhme, B. Dursun, J. Klute, S.H. Mirza, S. Pfeiffer, H. Schlarb
    DESY, Hamburg, Germany
  PETRA IV will be a new, fourth-generation, high-brilliance synchrotron radiation source in the hard X-ray range. To keep the emittance low at high beam current an active feedback system to damp transverse multi-bunch instabilities is required. The particular challenge to the system is the very low-noise, while maintaining high bandwidth, which is defined by the 2 ns bunch spacing. In this paper, we present the conceptual design of the transverse multi-bunch feedback (T-MBFB) system and technical challenges to fulfill the performance require-ments. An overview is given on the hardware and the method for detecting and damping the coupled-bunch oscillations. Using modern high-speed ADCs enables direct sampling of pulses from beam pick-ups, which removes the necessity for down-converters. Powerful digital signal processing allows not only for the effective feedback implementation, but also for developing versa-tile tools for the machine diagnostics.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP36  
About • Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 December 2022 — Issue date ※ 12 December 2022
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