Gain properties of gas electron multipliers (GEMS) for space applications

Toru Tamagawa; Asami Hayato; Koji Abe; Shinya Iwamoto; Satoshi Nakamura; Atsushi Harayama; Takanori Iwahashi; Kazuo Makishima; Hideki Hamagaki; Yorito L. Yamaguchi

doi:10.1117/12.789968

15 July 2008 Gain properties of gas electron multipliers (GEMS) for space applications

Toru Tamagawa, Asami Hayato, Koji Abe, Shinya Iwamoto, Satoshi Nakamura, Atsushi Harayama, Takanori Iwahashi, Kazuo Makishima, Hideki Hamagaki, Yorito L. Yamaguchi

Author Affiliations +

Proceedings Volume 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray; 70113V (2008) https://doi.org/10.1117/12.789968
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Toru Tamagawa, Asami Hayato, Koji Abe, Shinya Iwamoto, Satoshi Nakamura, Atsushi Harayama, Takanori Iwahashi, Kazuo Makishima, Hideki Hamagaki, and Yorito L. Yamaguchi "Gain properties of gas electron multipliers (GEMS) for space applications", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113V (15 July 2008); https://doi.org/10.1117/12.789968

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