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Properties of the Flight Model Gas Electron Multiplier for the GEMS MissionWe 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 10(exp 4) 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.
Document ID
20160005118
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Takeuchi, Yoko
(Institute of Physical and Chemical Research Saitama, Japan)
Kitaguchi, Takao
(Institute of Physical and Chemical Research Saitama, Japan)
Hayato, Asami
(Institute of Physical and Chemical Research Saitama, Japan)
Tamagawa, Toru
(Institute of Physical and Chemical Research Saitama, Japan)
Iwakiri, Wataru
(Institute of Physical and Chemical Research Saitama, Japan)
Asami, Fumi
(Institute of Physical and Chemical Research Saitama, Japan)
Yoshikawa, Akifumi
(Institute of Physical and Chemical Research Saitama, Japan)
Kaneko, Kenta
(Institute of Physical and Chemical Research Saitama, Japan)
Enoto, Teruaki
(Institute of Physical and Chemical Research Saitama, Japan)
Black, Kevin
(Adnet Systems, Inc. Greenbelt, MD, United States)
Hill, Joanne E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jahoda, Keith
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
April 18, 2016
Publication Date
July 24, 2014
Publication Information
Publication: Proceedings of SPIE
Publisher: SPIE
Volume: 9144
Subject Category
Instrumentation And Photography
Report/Patent Number
GSFC-E-DAA-TN28531
Meeting Information
Meeting: Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Location: Montreal, Quebec
Country: Canada
Start Date: June 22, 2014
End Date: June 27, 2014
Sponsors: International Society for Optical Engineering
Funding Number(s)
CONTRACT_GRANT: NNG12PL17C
CONTRACT_GRANT: JSPS No. 24740185
CONTRACT_GRANT: JSPS No. 255448
CONTRACT_GRANT: JSPS KAKENHI 22244034
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other
Keywords
gas electron multiplier (GEM)
X-ray polarimeter
GEMS mission

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