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Williams, L.R.

Paper Title Page
WEPLS141 Operational Experience with the LHC Waveguide Mode Reflectometer 2709
 
  • T. Kroyer, P. Borowiec, F. Caspers, Z. Sulek, L.R. Williams
    CERN, Geneva
 
  The LHC microwave mode reflectometer (assembly version) reached operational status by the end of 2005. It is now routinely used in the LHC tunnel to take data on the beam-screen of the individual LHC magnets and also groups of magnets with lengths up to 200 meter. The reflectometer operates in the frequency range from about 4GHz to 8 GHz and employs mode selective launchers. Data traces of typically 16000 data points are taken in the frequency domain with subsequent Fourier transformation into the time domain and numerical waveguide mode dispersion compensation. This paper discusses the operational aspects of the system as well as methods for clutter (fake reflection) elimination and procedures for cross-checks in case of a suspected obstacle or other fault.