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Proceedings Paper

Gain properties of gas electron multipliers (GEMS) for space applications
Author(s): Toru Tamagawa; Asami Hayato; Koji Abe; Shinya Iwamoto; Satoshi Nakamura; Atsushi Harayama; Takanori Iwahashi; Kazuo Makishima; Hideki Hamagaki; Yorito L. Yamaguchi
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Paper Abstract

Fine-pitch and thick-foil GEMs have been produced using a laser etching technique for photoelectric X-ray polarimeters onboard future missions. The finest hole pitch of the thick-foil GEM is 80 μm with a hole diameter of 40 μm, and a thickness of the insulator is 100 µm. The maximum effective gain in a 70%-30% mixture of argon and carbon dioxide reaches 3×104 at voltage of 750 V between GEM electrodes. No significant gain increase or decrease was observed during 24 hours test in which applied high voltage was ramped up and down frequently. The measured gain stability was less than 4%. An accelerated test of the high voltage ramp up and down for two years LEO operations were carried out. During the 6500 times voltage ramp up and down, the GEM kept its gain within 4% variation and no unexpected behavior was observed.

Paper Details

Date Published: 15 July 2008
PDF: 8 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113V (15 July 2008); doi: 10.1117/12.789968
Show Author Affiliations
Toru Tamagawa, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Asami Hayato, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Koji Abe, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Shinya Iwamoto, RIKEN (Japan)
Tokai Univ. (Japan)
Satoshi Nakamura, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Atsushi Harayama, Tokyo Univ. of Science (Japan)
Takanori Iwahashi, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Kazuo Makishima, Univ. of Tokyo (Japan)
RIKEN (Japan)
Hideki Hamagaki, Univ. of Tokyo (Japan)
Yorito L. Yamaguchi, Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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