Development of a Diehard GEM using PTFE insulator substrate

We have developed the gas electron multiplier (GEM) using polytetrafluoroethylene (PTFE) insulator substrate (PTFE-GEM). Carbonization on insulator layer by discharges shorts the GEM electrodes, causing permanent breakdown. Since PTFE is hard to be carbonized against arc discharges, PTFE-GEM is expe...

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Bibliographic Details
Published in:	Journal of instrumentation 2014-03, Vol.9 (3), p.C03043-C03043
Main Authors:	Wakabayashi, M, Komiya, K, Tamagawa, T, Takeuchi, Y, Aoki, K, Taketani, A, Hamagaki, H
Format:	Article
Language:	eng
Subjects:	Arc discharges Breakdown Carbon dioxide Conferences Electrodes Gain Instrumentation Insulators Polytetrafluoroethylenes
Online Access:	Get full text
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Summary:	We have developed the gas electron multiplier (GEM) using polytetrafluoroethylene (PTFE) insulator substrate (PTFE-GEM). Carbonization on insulator layer by discharges shorts the GEM electrodes, causing permanent breakdown. Since PTFE is hard to be carbonized against arc discharges, PTFE-GEM is expected to be robust against breakdown. Gains as high as 2.6 x 10 super(4) were achieved with PTFE-GEM (50 [is proportional to]m thick) in Ar/CO sub(2) = 70%/30% gas mixture at V sub(GEM) = 730 V. PTFE-GEM never showed a permanent breakdown even after suffering more than 40000 times discharges during the experiment. The result demonstrates that PTFE-GEM is really robust against discharges. We conclude that PTFE is an excellent insulator material for the GEM productions.
ISSN:	1748-0221 1748-0221