24 July 2014 Properties of the flight model gas electron multiplier for the GEMS mission
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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.
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Yoko Takeuchi, Yoko Takeuchi, Takao Kitaguchi, Takao Kitaguchi, Asami Hayato, Asami Hayato, Toru Tamagawa, Toru Tamagawa, Wataru Iwakiri, Wataru Iwakiri, Fumi Asami, Fumi Asami, Akifumi Yoshikawa, Akifumi Yoshikawa, Kenta Kaneko, Kenta Kaneko, Teruaki Enoto, Teruaki Enoto, Kevin Black, Kevin Black, Joanne E. Hill, Joanne E. Hill, Keith Jahoda, Keith Jahoda, "Properties of the flight model gas electron multiplier for the GEMS mission", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444N (24 July 2014); doi: 10.1117/12.2057159; https://doi.org/10.1117/12.2057159
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