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Proceedings Paper

Ground calibration of CCD camera (XIS) with front-illuminated chips onboard Astro-E2
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Paper Abstract

We report on the results of the ground calibration of Astro-E2/XIS with front-illuminated (FI) chips. The sensors have basically the same performance as that of Astro-E/XIS. However, there are some improved points: (1) A 55Fe radio isotope is equipped on a door, and (2) a charge injection (CI)capability (described below) is added. The FI sensors have been calibrated at Kyoto University, Osaka University, and MIT. At Kyoto University we focus on the high energy range (>1.5 keV). We measured the gain, energy resolution, and quantum efficiency as the function of energy by using characteristic X-rays for each sensor. An energy resolution of 130 eV@5.9 keV (FWHM) and a quantum efficiency of 82%@6.4 keV are achieved. After XIS is launched, the Charge Transfer Inefficiency (CTI) increases due to the radiation damage by cosmic rays. Then XIS equips the CI capability to calibrate and compensate the increase of the CTI. In order to utilize the CI capability, the amount of charge injected into the CCDs is expected to be kept constant. The time variability of the amount of the injected charge is estimated.

Paper Details

Date Published: 11 October 2004
PDF: 12 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.550831
Show Author Affiliations
Hiroshi Nakajima, Kyoto Univ. (Japan)
Hiroya Yamaguchi, Kyoto Univ. (Japan)
Hironori Matsumoto, Kyoto Univ. (Japan)
Takeshi Tsuru, Kyoto Univ. (Japan)
Katsuji Koyama, Kyoto Univ. (Japan)
Steve Kissel, Massachusettts Institute of Technology (United States)
Beverly LaMarr, Massachusettts Institute of Technology (United States)
Marshall W. Bautz, Massachusettts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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