P. Fonte, V. Peskov, B.D. Ramsey
"Which Gaseous Detector is the Best at High Rates?"
SLAC-JOURNAL-ICFA-16-2
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Abstract:
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We report results from a systematic study of breakdown limits
for various high rate gaseous detectors: PPAC's, MGC's, diamond-coated
MSGC's, MICROMEGAS, CAT. It was found that for all these detectors,
the maximum achievable gain, before breakdown appears, drops
dramatically with incident flux, and is sometimes inversely
proportional to it. Further, in the presence of alpha particles,
typical of the backgrounds in high-energy experiments, additional gain
drops by 1-2 orders of magnitude were observed for some detectors. We
discovered that breakdowns at high rates occur through what we have
termed an "accumulative mechanism", which does not seem to have been
previously reported in the literature. Results of these studies may
help to choose the optimum detector for given experimental conditions
Last modified: 1 June 1998,
Jochen.