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, Oswald H. Siegmund
2013 UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII  
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
more » ... tudy 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.
doi:10.1117/12.2024541 fatcat:yn2ausmd4bghdehlkh2muvbwv4