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Space-charge limitation of avalanche growth in narrow-gap resistive plate chambers

โœ Scribed by M.C.S Williams

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
175 KB
Volume
525
Category
Article
ISSN
0168-9002

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โœฆ Synopsis

A big advance in resistive plate chamber technology happened in 1996 with the advent of the multigap resistive plate chamber (MRPC). The MRPC allows us to easily construct detectors with many small gas gaps and thus we obtain good timing together with high detection efficiency. Using this technology, it is now common to build detectors with gas gaps of 200-300 mm in width. This paper examines space-charge limited avalanche growth; this becomes a dominant effect for narrow gap resistive plate chambers. This effect controls gas gain and explains the reason for the excellent behaviour of MRPCs built with this gas gap.

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We performed a direct measurement of the avalanche charge with a 10 ร‚ 10 cm 2 prototype resistive plate chambers with a 0.2 cm gas gap. We studied its behaviour with respect to the high voltage and its dependence on the presence of the SF 6 in the gas mixture (C 2 H 2 F 4 /i-C 4 H 10 /SF 6 in the ra