Development of gas electron multiplier foils with a laser etching technique期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Development of gas electron multiplier foils with a laser etching technique

Authors:	T Tamagawa N Tsunoda A Hayato H Hamagaki M Inuzuka H Miyasaka I Sakurai F Tokanai K Makishima

Affiliation:	^aRIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan ^bDepartment of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjyuku-ku, Tokyo 162-8601, Japan ^cCenter for Nuclear Study (CNS), University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan ^dNational Research Institute for Cultural Properties, Tokyo, 13-43 Ueno Park, Taito-ku, Tokyo 110-8713, Japan ^eCaltech, MC 220-47, Pasadena, CA 91125, USA ^fEcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa, Nagoya, Aiti 464-8603, Japan ^gDepartment of Physics, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan ^hDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Abstract:	Fine-pitch gas electron multiplier (GEM) foils have been produced for cosmic X-ray polarimeters using a carbon dioxide laser etching technique. The finest hole pitch of the foil which can be produced repeatedly is and the smallest hole diameter is . The electron amplification factor was measured as a function of applied voltage. The behavior of the factor is almost the same as the -pitch standard foil fabricated by CERN. Our GEMs had no rate-dependent gain instability, which is expected of the GEMs having holes of good cylindrical geometry. The amplification factor of the foil in a mixture of 70% argon and 30% carbon dioxide reaches about 5000 without any micro-discharge at a voltage of 570 V between foil electrodes.

Keywords:	GEM Gas electron multiplier Gas detector Cosmic X-ray polarimeter
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