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Guerrero, A.

Paper Title Page
PM12 The SPS Individual Bunch Measurement System 192
 
  • A. Guerrero, H. Jakob, J.J. Savioz, R. Jones
    CERN, Geneva, Switzerland
 
  The Individual Bunch Measurement System (IBMS) allows the intensity of each bunch in an LHC batch to be the measured both in the PS to SPS transfer lines and in the SPS ring itself. The method is based on measuring the peak and valley of the analogue signal supplied by a Fast Beam Current Transformer at a frequency of 40MHz. A 12 bit acquisition system is required to obtain a 1 % resolution for the intensity range of 5×109 to 1.7×1011 protons per bunch, corresponding to the pilot and ultimate LHC bunch intensities. The acquisition selection and external trigger adjustment system is driven by the 200MHz RF, which is distributed using a single-mode fibre-optic link. A local oscilloscope, controlled via a GPIB interface, allows the remote adjustment of the timing signals. The low-level software consists of a realtime task and a communication server run on a VME Power PC, which is accessed using a graphical user interface. This paper describes the system as a whole and presents some recent uses and results from the SPS run in 2000.