Author: Baer, T.
Paper Title Page
MOPC43 Performance of Detectors using Diamond Sensors at the LHC and CMS 174
  • M. Hempel
    BTU, Cottbus, Germany
  • T. Baer, A.E. Dabrowski
    CERN, Geneva, Switzerland
  • E. Griesmayer
    ATI, Wien, Austria
  • W. Lange, O. Novgorodova
    DESY Zeuthen, Zeuthen, Germany
  • W. Lohmann
    DESY, Hamburg, Germany
  • N.J. Odell
    NU, Evanston, USA
  • D.P. Stickland
    PU, Princeton, New Jersey, USA
  Diamond detectors are used as beam loss and luminosity monitors for CMS and LHC. A time resolution in the nanosecond range allows to detect beam losses and luminosities of single bunches. The radiation hardness and negligible temperature dependence allow the usage of diamond sensors in high radiation fields without cooling. Two different diamond detector types are installed at LHC and CMS. One is based on pCVD diamonds and installed at different locations in the LHC tunnel for beam loss monitoring. Measurements of these detectors are used to perform a bunch-by-bunch beam loss analysis. They allow to disentangle the origin of beam losses. The second type uses sCVD diamonds and is located inside CMS for van-der-Meer scan, beam halo and online luminosity monitoring and around the LHC tunnel for beam loss observation. Results on the performance of these detectors will be presented and examples of the use for analyzing the beam conditions will be given. In order to persist the enhanced requirements of the LHC after the long shutdown, e.g. higher luminosity, an upgrade of the detectors is required. The concept of the new detectors will be presented and first results will be shown.  
poster icon Poster MOPC43 [0.721 MB]  
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]