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Proceedings Paper

The onboard calibration for the spaced-row charge injection of the Suzaku XIS
Author(s): Hideki Uchiyama; Yoshiaki Hyodo; Hiroya Yamaguchi; Hiroshi Nakajima; Hideyuki Mori; Takeshi Go Tsuru; Hironori Matsumoto; Katsuji Koyama; Ken'ichi Torii; Satoru Katsuda; Kazuto Hasuike; Kiyoshi Hayashida; Hiroshi Tsunemi; Hiroshi Murakami; Tadayasu Dotani; Gregory Prigozhin; Steve Kissel; Eric Miller; Beverly LaMarr; Marshall Bautz
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Paper Abstract

The energy resolution of the X-ray CCDs onboard the Suzaku satellite (X-ray Imaging Spectrometer; XIS) has been degraded since the launch due to radiation damage. To recover from this, we have applied a spaced-row charge injection (SCI) technique to the Suzaku XIS in orbit. By injecting charge into CCD rows periodically, the energy resolution 14 months after launch is improved from 210 eV to 150 eV at 5.9 keV, which is close to the resolution just after the launch (140 eV). Additional information on these results is given in a companion paper by the XIS team. In this paper, we report the details of CCD charge transfer inefficiency (CTI) in the SCI mode, the correction method, and the implementation of it in ground analysis software for XIS data. In the SCI mode, CTI depends on the distance of a charge packet from the nearest charge-injected row, and the gain shows a periodic non-uniformity. Using flight data obtained with the onboard calibration sources, as well as a cosmic source (the Perseus cluster of galaxies), we studied the non-uniformity in detail. We developed a method to correct for the non-uniformity that will be valuable as the radiation damage progresses in future.

Paper Details

Date Published: 13 September 2007
PDF: 9 pages
Proc. SPIE 6686, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV, 66860P (13 September 2007); doi: 10.1117/12.733689
Show Author Affiliations
Hideki Uchiyama, Kyoto Univ. (Japan)
Yoshiaki Hyodo, Kyoto Univ. (Japan)
Hiroya Yamaguchi, Kyoto Univ. (Japan)
Hiroshi Nakajima, Kyoto Univ. (Japan)
Hideyuki Mori, Kyoto Univ. (Japan)
Takeshi Go Tsuru, Kyoto Univ. (Japan)
Hironori Matsumoto, Kyoto Univ. (Japan)
Katsuji Koyama, Kyoto Univ. (Japan)
Ken'ichi Torii, Osaka Univ. (Japan)
Satoru Katsuda, Osaka Univ. (Japan)
Kazuto Hasuike, Osaka Univ. (Japan)
Kiyoshi Hayashida, Osaka Univ. (Japan)
Hiroshi Tsunemi, Osaka Univ. (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)
Tadayasu Dotani, Japan Aerospace Exploration Agency (Japan)
Gregory Prigozhin, Massachusetts Institute of Technology (United States)
Steve Kissel, Massachusetts Institute of Technology (United States)
Eric Miller, Massachusetts Institute of Technology (United States)
Beverly LaMarr, Massachusetts Institute of Technology (United States)
Marshall Bautz, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6686:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
Oswald H.W. Siegmund, Editor(s)

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