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Modeling Contamination Migration on the Chandra X-ray Observatory - II

Authors :
O'Dell, Stephen L
Swartz, Douglas A
Tice, Neil W
Plucinsky, Paul P
Grant, Catherine E
Marshall, Herman L
Vikhlinin, Alexey A
Tennant, Allyn F
Publication Year :
2013
Publisher :
United States: NASA Center for Aerospace Information (CASI), 2013.

Abstract

During its first 14 years of operation, the cold (about -60C) 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.

Subjects

Subjects :
Astrophysics

Details

Language :
English
Database :
NASA Technical Reports
Publication Type :
Report
Accession number :
edsnas.20140005792
Document Type :
Report