Author: Yee, C.
Paper Title Page
THCPR07 Electronics for LCLS-II Beam Containment System Loss Monitors 1641
  • R.A. Kadyrov, C.I. Clarke, A.S. Fisher, M. Petree, C. Yee
    SLAC, Menlo Park, California, USA
  LCLS-II is a new FEL which is under construction at SLAC National Accelerator Laboratory. Its superconducting electron linac is able to produce up to 1.2 MW of beam power. In event of electron beam loss, radiation levels can exceed allowed levels outside thin shielding originally built for a lower energy LCLS linac. Beam Containment System (BCS) loss monitors are employed to detect the radiation and shut-off the beam within 200 µs, limit the radiation dose in occupied areas and minimize damage to the equipment. sCVD single-crystal diamond particle detectors are used as Point Beam Loss Monitors (PBLM) to detect losses locally. Fiber optics is selected as Long Beam Loss Monitor (LBLM). PMT at downstream end of the LBLM detects light produced by Cherenkov radiation. LBLM provides continuous coverage along electron beam path from the gun to the dump. Unified set of electronics is designed to integrate the charge from PMT or sCVD, compare the loss with predefined threshold and generate the fault if the limit is breached. Continuous self-checking is implemented for both types of sensors. Challenges in electronics design, cable selection and self-checking implementation are discussed.  
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About • paper received ※ 27 September 2019       paper accepted ※ 09 October 2019       issue date ※ 30 August 2020  
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