Author: Effinger, E.
Paper Title Page
MOPC45 A Prototype Readout System for the Diamond Beam Loss Monitors at LHC 182
  • E. Effinger, T. Baer, B. Dehning, R. Schmidt
    CERN, Geneva, Switzerland
  • H. Frais-Kölbl
    FH WN, Wiener Neustadt, Austria
  • E. Griesmayer
    ATI, Wien, Austria
  • P. Kavrigin
    CIVIDEC Instrumentation, Wien, Austria
  Diamond Beam Loss Monitors are used at the LHC for the measurement of fast beam losses. Results from specimen LHC loss measurements are presented in this talk. The bunch-to-bunch loss measurements make full use of the fast signal response of the diamond detectors with 1 ns time resolution and 6.7 ns double pulse resolution. The data processing is done with a dedicated readout system, which was designed and optimized for particular applications with the diamond beam loss monitors. This FPGA-based system provides on-line, real-time, and dead-time-free data processing. Several examples are presented: the Time Loss Histogram with 1.6 ns binning provides beam loss measurements that are synchronized with the revolution period throughout the full operational LHC cycle. The Post Mortem Recorder with a sampling frequency of 1 GS/s allows beam-loss-based tune estimates for all bunches in parallel. Future applications and upgrades are discussed.  
poster icon Poster MOPC45 [0.778 MB]  
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.