Charge-Transfer Properties in the Gas Electron Multiplier

Sanghyo Han, Hyosung Cho, Yongkyun Kim, Heedong Kang, Chongeun Chung, Sangmook Kang, Sehwan Park, Jang Min Han, Yong Sub Cho, Do Hyung Kim, Young Jun Kim, Kyoungkeun Jeong, Tae Hoon Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The charge transfer properties of a gas electron multiplier (GEM) were systematically investigated over a broad range of electric field configurations. The electron collection efficiency and the charge sharing were found to depend on the external fields, as well as on the GEM voltage. The electron collection efficiency increased with the collection field up to 90%, but was essentially independent of the drift field strength. A double conical GEM has a 10% gain increase with time due to surface charging by avalanche ions whereas this effect was eliminated with the cylindrical GEM. The positive-ion feedback is also estimated.

Original languageEnglish
Pages (from-to)326-329
Number of pages4
JournalJournal of Nuclear Science and Technology
Volume41
DOIs
StatePublished - Mar 2004

Keywords

  • Charge sharing
  • Electron collection efficiency
  • Gas electron multiplier
  • Surface charging

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