Paper | Title | Other Keywords | Page | ||
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CT10 | Real Time Display of the Vertical Beam Sizes in LEP Using the BEXE X-Ray Detector and Fast VME Based Computers | electron, luminosity, synchrotron, radiation | 87 | ||
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Fast X-ray detectors based on CdTe photoconductors
have been installed in LEP since the beginning of its
operation in 1989. The angular divergence of the high
energy photons from the synchrotron radiation (x-rays)
and the narrow spacing of the 64 photoconductors of the
detector allow a good measurement of vertical beam
profiles down to an rms beam size of 300 mm.
This paper presents some specific parameters and
experimental results of an upgrade program in which the
local processing power of the front-end electronics has
been increased by a factor 50. Such a powerful tool has
allowed a real time display of the time evolution of the
vertical beam sizes. An online correlation plot between
the electron and positron beam sizes (turn by turn) is
also displayed.
These online video images are available in the LEP
control room and are used in daily operation for
luminosity optimisation.
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