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Soft x-ray imager (SXI) onboard ASTRO-H

2016; SPIE; Volume: 9905; Linguagem: Inglês

10.1117/12.2230672

1996-756X

H. Tsunemi, Kiyoshi Hayashida, Takeshi Go Tsuru, Tadayasu Dotani, Hiroshi Nakajima, Naohisa Anabuki, Ryo Nagino, T. Tanaka, Hiroyuki Uchida, Masanori Ozaki, Chikara Natsukari, Hiroshi Tomida, Shutaro Ueda, Masachika Iwai, Masayoshi Nobukawa, Junko S. Hiraga, Takayoshi Kohmura, Hiroshi Murakami, Koji Mori, M. Yamauchi, Isamu Hatsukade, Yusuke Nishioka, Aya Bamba, Kumiko K. Nobukawa, J. Doty,

Particle Detector Development and Performance

We report here the performance of the SXI on ASTRO-H that was started its operation from March,02 2016. The SXI consists of 4 CCDs that cover 38' X 38' sky region. They are P-channel back-illumination type CCD with a depletion layer of 200 μm. Charge injection (CI) method is applied from its beginning of the mission. Two single stage sterling coolers are equipped with the SXI while one of them has enough power to cool the CCD to -110°C. There are two issues in the SXI performance: one is a light-leak and the other is a cosmic-ray echo. The light-leak is due to the fact that the day-Earth irradiates visible lights onto the SXI body through holes in the satellite base plate. It can be avoided by selecting targets not on the anti-day-Earth direction. The cosmic-ray echo is due to the improper parameter values that is fixed by revising them with which the cosmic-ray echo does not affect the image. Using the results of RXJ1856.5-3754, we confirm that the possible contaminants on the CCD is well within our expectation.