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PM12 |
The SPS Individual Bunch Measurement System
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192 |
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- A. Guerrero, H. Jakob, J.J. Savioz, R. Jones
CERN, Geneva, Switzerland
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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.
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