Author: Branger, E.
Paper Title Page
MOPC47 Monte Carlo Simulations of Beam Losses in the Test Beam Line of CTF3 189
 
  • E. Nebot Del Busto, S. Mallows, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • E. Branger
    Linköping University, Linköping, Sweden
  • S. Döbert, E.B. Holzer, R.L. Lillestøl, S. Mallows, E. Nebot Del Busto
    CERN, Geneva, Switzerland
  • R.L. Lillestøl
    University of Oslo, Oslo, Norway
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  The Test Beam Line (TBL) of the CLIC Test Facility 3 (CTF3) aims to validate the drive beam deceleration concept of CLIC, in which the RF power requested to boost particles to multi-TeV energies is obtained via deceleration of a high current and low energy drive beam (DB). Despite a TBL beam energy (150-80 MeV) significantly lower than the minimum nominal energy of the CLIC DB (250 MeV), the pulse time structure of the TBL provides the opportunity to measure beam losses with CLIC-like DB timing conditions. In this contribution, a simulation study on the detection of beam losses along the TBL for the commissioning of the recently installed beam loss monitoring system is presented. The most likely loss locations during stable beam conditions are studied by considering the beam envelope defined by the FODO lattice as well as the emittance growth due to the deceleration process. Moreover, the optimization of potential detector locations is discussed. Several factors are considered, namely: the distance to the beam, the shielding provided by the different elements of the line, the detector sensitivity and possible saturation effects of both the radiation detectors and electronics.  
 
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.