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Proceedings Paper

Lifetime estimation of a time projection chamber x-ray polarimeter
Author(s): Joanne E. Hill; J. Kevin Black; Lubos Brieda; Patsy L. Dickens; Kristina Montt de Garcia; Douglas L. Hawk; Asami Hayato; Keith Jahoda; Jelila Mohammed
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Paper Abstract

The Gravity and Extreme Magnetism Small Explorer (GEMS) X-ray polarimeter Instrument (XPI) was designed to measure the polarization of 23 sources over the course of its 9 month mission. The XPI design consists of two telescopes each with a polarimeter assembly at the focus of a grazing incidence mirror. To make sensitive polarization measurements the GEMS Polarimeter Assembly (PA) employed a gas detection system based on a Time Projection Chamber (TPC) technique. Gas detectors are inherently at risk of degraded performance arising from contamination from outgassing of internal detector components or due to loss of gas. This paper describes the design and the materials used to build a prototype of the flight polarimeter with the required GEMS lifetime. We report the results from outgassing measurements of the polarimeter subassemblies and assemblies, enclosure seal tests, life tests, and performance tests that demonstrate that the GEMS lifetime is achievable. Finally we report performance measurements and the lifetime enhancement from the use of a getter.

Paper Details

Date Published: 26 September 2013
PDF: 14 pages
Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590O (26 September 2013); doi: 10.1117/12.2024724
Show Author Affiliations
Joanne E. Hill, NASA Goddard Space Flight Ctr. (United States)
J. Kevin Black, NASA Goddard Space Flight Ctr. (United States)
Rock Creek Scientific (United States)
Lubos Brieda, NASA Goddard Space Flight Ctr. (United States)
Millennium Engineering and Integration Co. (United States)
Patsy L. Dickens, NASA Goddard Space Flight Ctr. (United States)
Stinger Ghaffarian Technologies, Inc. (United States)
Kristina Montt de Garcia, NASA Goddard Space Flight Ctr. (United States)
Douglas L. Hawk, NASA Goddard Space Flight Ctr. (United States)
ATK Space Systems (United States)
Asami Hayato, RIKEN (Japan)
Keith Jahoda, NASA Goddard Space Flight Ctr. (United States)
Jelila Mohammed, NASA Goddard Space Flight Ctr (United States)


Published in SPIE Proceedings Vol. 8859:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII
Oswald H. Siegmund, Editor(s)

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