Keyword: power-supply
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MOP27 The Design and Implementation of Fast Machine Protection System for CSNS operation, machine-protect, linac, DTL 151
  • P. Zhu, Y.C. He, D.P. Jin, Y.L. Zhang
    IHEP, Beijing, People’s Republic of China
  • L. Wang, X. Wu, K. Xue
    IHEP CSNS, Guangdong Province, People’s Republic of China
  The high-quality of fast machine protection system(FPS) is one of the significant conditions for the stable and reliable operation of the Chinese Spallation Neutron Source (CSNS) accelerator. Based on the design concept of high availability, high reliability and high maintainability, we adopt the distributed architecture based on "high-performance Field Programmable Gate Array (FPGA) chip + Gigabit Transceiver with Low Power (GTP)+ VME bus read and write by real-time", which is demonstrated the superior performance to satisfy the requirements of the CSNS accelerator during commissioning and operation. The main design and implementation include: (1) develop diversity signal interface boards achieving a flexible interaction; (2) explore and realize protection strategies improving beam efficiency; (3) self-define and implement the creative and practical functions enhancing the robustness of the system, such as signal heartbeat monitoring, fail-safe mechanism, automatic reset, and so on. The CSNS accelerator fast machine protection system has been put into operation for nearly five years with strong operability and availability, thorough traversal and response time-consuming tests.  
poster icon Poster MOP27 [0.830 MB]  
DOI • reference for this paper ※  
About • Received ※ 30 October 2021 — Revised ※ 24 October 2021 — Accepted ※ 05 November 2021 — Issue date ※ 11 April 2022
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TUAC2 Impact of Power Supply Ripple on the Beam Performance of the Large Hadron Collider and the High-Luminosity LHC experiment, dipole, betatron, operation 170
  • S. Kostoglou, H. Bartosik, Y. Papaphilippou, G. Sterbini
    CERN, Geneva, Switzerland
  Harmonics of the mains frequency (50 Hz) have been systematically observed in the form of dipolar excitations in the transverse beam spectrum of the Large Hadron Collider (LHC) since the beginning of its operation. The power supply ripple, consisting of both fundamental and higher frequency components, is proven not to be the result of an artifact of the instrumentation systems with which they are observed. Potential sources of the perturbation have been identified through systematic analysis and experimental studies. Single-particle tracking simulations have been performed including a realistic power supply ripple spectrum, as acquired from experimental observations, to demonstrate the impact of such noise effects on beam performance.  
slides icon Slides TUAC2 [3.678 MB]  
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About • Received ※ 04 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 23 November 2021 — Issue date ※ 25 February 2022
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