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Proceedings Paper

Properties of the flight model gas electron multiplier for the GEMS mission
Author(s): Yoko Takeuchi; Takao Kitaguchi; Asami Hayato; Toru Tamagawa; Wataru Iwakiri; Fumi Asami; Akifumi Yoshikawa; Kenta Kaneko; Teruaki Enoto; Kevin Black; Joanne E. Hill; Keith Jahoda
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Paper Abstract

We present the gain properties of the gas electron multiplier (GEM) foil in pure dimethyl ether (DME) at 190 Torr. The GEM is one of the micro pattern gas detectors and it is adopted as a key part of the X-ray polarimeter for the GEMS mission. The X-ray polarimeter is a time projection chamber operating in pure DME gas at 190 Torr. We describe experimental results of (1) the maximum gain the GEM can achieve without any discharges, (2) the linearity of the energy scale for the GEM operation, and (3) the two-dimensional gain variation of the active area. First, our experiment with 6.4 keV X-ray irradiation of the whole GEM area demonstrates that the maximum effective gain is 2 x 104 with the applied voltage of 580 V. Second, the measured energy scale is linear among three energies of 4.5, 6.4, and 8.0 keV. Third, the two-dimensional gain mapping test derives the standard deviation of the gain variability of 7% across the active area.

Paper Details

Date Published: 24 July 2014
PDF: 8 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444N (24 July 2014); doi: 10.1117/12.2057159
Show Author Affiliations
Yoko Takeuchi, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Takao Kitaguchi, RIKEN (Japan)
Asami Hayato, RIKEN (Japan)
Toru Tamagawa, RIKEN (Japan)
Wataru Iwakiri, RIKEN (Japan)
Fumi Asami, RIKEN (Japan)
Akifumi Yoshikawa, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Kenta Kaneko, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Teruaki Enoto, RIKEN (Japan)
NASA Goddard Space Flight Ctr. (United States)
Kevin Black, NASA Goddard Space Flight Ctr. (United States)
Joanne E. Hill, NASA Goddard Space Flight Ctr. (United States)
Keith Jahoda, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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