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Proceedings Paper

Evolution of temperature-dependent charge transfer inefficiency correction for ACIS on the Chandra X-ray Observatory
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Paper Abstract

As ACIS on the Chandra X-ray Observatory enters its seventeenth year of operation, it continues to perform well and produce spectacular scientific results. The response of ACIS has evolved over the lifetime of the observatory due to radiation damage and aging of the spacecraft. The ACIS instrument team developed a software tool which applies a correction to each X-ray event and mitigates charge transfer inefficiency (CTI) and spectral resolution degradation. The behavior of the charge traps that cause CTI are temperature dependent, however, and warmer temperatures reduce the effectiveness of the correction algorithm. As the radiator surfaces on Chandra age, ACIS cooling has become less efficient and temperatures can increase by a few degrees. A temperature-dependent component was added to the CTI correction algorithm in 2010. We present an evaluation of the effectiveness of this algorithm as the radiation damage and thermal environment continue to evolve and suggest updates to improve the calibration fidelity.

Paper Details

Date Published: 18 July 2016
PDF: 11 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990545 (18 July 2016); doi: 10.1117/12.2233424
Show Author Affiliations
Catherine E. Grant, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
Marshall W. Bautz, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
R. Nick Durham, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul P. Plucinsky, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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