NDLI: Lifetime estimation of a time projection chamber x-ray polarimeter

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Lifetime estimation of a time projection chamber x-ray polarimeter

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hill, Joanne E. deGarcia, Kristina Montt Dickens, Patsy L. Brieda Sr., Lubos Mohammed, Jelila Hawk, Douglas L. Black, J. Kevin Hayato, Asami Jahoda, Keith
Copyright Year	2013
Description	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.
File Size	861913
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20140013398
Archival Resource Key	ark:/13960/t0dv6j75k
Language	English
Publisher Date	2013-09-30
Access Restriction	Open
Subject Keyword	Dimethyl Ether X-ray Polarimeter Structural Design X Ray Detectors Polarimeters Life Durability Dimethyl Compounds Materials Selection Polarimetry X Ray Apparatus Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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