Modeling contamination migration on the Chandra X-ray Observatory II

Stephen L. O'Dell; Douglas A. Swartz; Neil W. Tice; Paul P. Plucinsky; Catherine E. Grant; Herman L. Marshall; Alexey Vikhlinin; Allyn F. Tennant

doi:10.1117/12.2024541

27 September 2013 Modeling contamination migration on the Chandra X-ray Observatory II

Stephen L. O'Dell, Douglas A. Swartz, Neil W. Tice, Paul P. Plucinsky, Catherine E. Grant, Herman L. Marshall, Alexey Vikhlinin, Allyn F. Tennant

Author Affiliations +

Proceedings Volume 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII; 88590F (2013) https://doi.org/10.1117/12.2024541
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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.

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Stephen L. O'Dell, Douglas A. Swartz, Neil W. Tice, Paul P. Plucinsky, Catherine E. Grant, Herman L. Marshall, Alexey Vikhlinin, and Allyn F. Tennant "Modeling contamination migration on the Chandra X-ray Observatory II", Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590F (27 September 2013); https://doi.org/10.1117/12.2024541

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