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The Fundamental Gain Limitation of High-Rate Gaseous Detectors and Optimum Designs for High-Rate ApplicationsWe have performed a systematic study of the breakdown mechanism of high-rate detectors: MSGC, MGC, MICROMEGAS and GEM, recently chosen or considered as candidates for high-luminosity applications, together with newly elaborated designs such as high-rate wire chambers, thin gap parallel-plate chamber and super-high-rate RPC's. It was found for all these that the maximum breakdown-limited dramatically with incident flux and further decreases in the presence of alpha particles which are typical of the backgrounds in high-energy experiments. It was determined that the key parameter that limits a detector's performance is the effective current density in the avalanche, and that above a certain value breakdowns occur. At these limits the subsequent breakdowns take place by a mechanism which does not seem to have been previously reported in the literature. We present the results of this study together with a qualitative theory of this new type of breakdown and suggestions for optimizing high-rate detectors which we have verified experimentally.
Document ID
19990058134
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Fonte, Paulo
(Coimbra Univ. Coimbra, Portugal)
Peskov, Vladimir
(NASA Marshall Space Flight Center Huntsville, AL United States)
Ramsey, Brian D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Nuclear Scienec and Medical Imaging
Location: Toronto
Country: Canada
Start Date: November 8, 1998
End Date: November 14, 1998
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Other

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