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Proceedings Paper

Modeling contamination migration on the Chandra X-ray Observatory II
Author(s): Stephen L. O'Dell; Douglas A. Swartz; Neil W. Tice; Paul P. Plucinsky; Catherine E. Grant; Herman L. Marshall; Alexey Vikhlinin; Allyn F. Tennant
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Paper Abstract

During its first 14 years of operation, the cold (about -60°C) optical blocking filter of the Advanced CCD Imaging Spectrometer (ACIS), aboard the Chandra X-ray Observatory, has accumulated a growing layer of molecular contamination that attenuates low-energy x rays. Over the past few years, the accumulation rate, spatial distribution, and composition have changed. This evolution has motivated further analysis of contamination migration within and near the ACIS cavity. To this end, the current study employs a higher-fidelity geometric model of the ACIS cavity, detailed thermal modeling based upon temperature data, and a refined model of the molecular transport.

Paper Details

Date Published: 27 September 2013
PDF: 12 pages
Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590F (27 September 2013); doi: 10.1117/12.2024541
Show Author Affiliations
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Douglas A. Swartz, Universities Space Research Association (United States)
Neil W. Tice, Massachusetts Institute of Technology (United States)
Paul P. Plucinsky, Smithsonian Astrophysical Observatory (United States)
Catherine E. Grant, Massachusetts Institute of Technology (United States)
Herman L. Marshall, Massachusetts Institute of Technology (United States)
Alexey Vikhlinin, Smithsonian Astrophysical Observatory (United States)
Allyn F. Tennant, NASA Marshall 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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