Author: Devlin, L.J.
Paper Title Page
WEPC43 Update on Beam Loss Monitoring at CTF3 for CLIC 787
 
  • L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • E. Branger
    Linköping University, Linköping, Sweden
  • L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto
    The University of Liverpool, Liverpool, United Kingdom
  • E. Effinger, E.B. Holzer, S. Mallows, E.N. del Busto
    CERN, Geneva, Switzerland
  
  Funding: Work supported by STFC Cockcroft Institute Core Grant No. ST/G008248/1
The pri­mary role of the beam loss mon­i­tor­ing (BLM) sys­tem for the com­pact lin­ear col­lider (CLIC) study is to work within the ma­chine pro­tec­tion sys­tem. Due to the size of the CLIC fa­cil­ity, a BLM that cov­ers large dis­tances along the beam­line is highly de­sir­able, in par­tic­u­lar for the CLIC drive beam de­cel­er­a­tors, which would al­ter­na­tively re­quire some ~40,000 lo­calised mon­i­tors. There­fore, an op­ti­cal fiber BLM sys­tem is cur­rently under in­ves­ti­ga­tion which can cover large sec­tions of beam­line at a time. A mul­ti­mode fiber has been in­stalled along the Test Beam Line at the CLIC test fa­cil­ity (CTF3) where the de­tec­tion prin­ci­ple is based on the pro­duc­tion of Cherenkov pho­tons within the fiber re­sult­ing from beam loss and their sub­se­quent trans­port along the fiber where they are then de­tected at the fiber ends using sil­i­con pho­to­mul­ti­pli­ers. Sev­eral ad­di­tional mon­i­tors in­clud­ing ACEMs, PEP-II and di­a­mond de­tec­tors have also been in­stalled. In this con­tri­bu­tion the first re­sults from the BLMs are pre­sented, com­par­isons of the sig­nals from each BLM are made and the pos­si­ble achiev­able lon­gi­tu­di­nal res­o­lu­tion from the fiber BLM sig­nal con­sid­er­ing var­i­ous loss pat­terns is dis­cussed.