Space charge effect in SQS transition in a gas counter

Hideaki Ohgaki, Hitoshi Kametani, Yasuyuki Fujita, Yuusuke Uozumi, Hidenobu Ijiri, Masaru Matoba, Takeji Sakae, Norihiko Koori

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Systematic investigation of the gas multiplication characteristics in the transition region from the proportional to SQS mode in a cylindrical proportional counter has been performed. The property of saturation of the gas multiplication factor can be reproduced using the effective electric field which is corrected for the space charge related to the positive ion density in the avalanche. Photon-mediated gas multiplication can explain the large jump phenomenon of the SQS transition. It is shown that the effective electric field in the avalanche becomes almost zero near the anode surface (Meek's streamer condition) at the 50% transition voltage and the region of its maximum moves slightly away from the anode surface.

Original languageEnglish
Pages (from-to)411-416
Number of pages6
JournalNuclear Inst. and Methods in Physics Research, A
Issue number3
Publication statusPublished - Nov 1 1990

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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