Initial operations of the Soft X-ray Imager onboard XRISM

X-Ray Imaging and Spectroscopy Mission (XRISM) is an astronomical satellite with the capability of high-resolution spectroscopy with the X-ray microcalorimeter, Resolve, and wide field-of-view imaging with the charge-coupled device (CCD) camera, Xtend. Xtend consists of the mirror assembly (X-ray Mirror Assembly) and detector, Soft X-ray Imager (SXI). The SXI is composed of CCDs, analog and digital electronics, and a mechanical cooler. After the successful launch on September 6, 2023 (UT) and subsequent critical operations, the mission instruments were turned on and set up. The CCDs have been kept at the designed operating temperature of −110°C after the electronics and cooling system were successfully set up. During the initial operation phase, which continued for more than a month after the critical operations, we verified the observation procedure, stability of the cooling system, all the observation options with different imaging areas and/or timing resolutions, and time-tagged and automated operations, including those for South Atlantic Anomaly passages. We optimized the operation procedure and observation parameters, including the cooler settings, imaging areas for the small window modes, and the event selection algorithm. We summarize our policy and procedure of the initial operations for the SXI. We also report on a couple of issues we faced during the initial operations and lessons learned from them.

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Publication Details

Journal
Journal of Astronomical Telescopes Instruments and Systems
Published
2025-03-11
DOI
https://doi.org/10.1117/1.jatis.11.4.042003
Citations
2
Primary Topic
Advanced X-ray Imaging Techniques
Type
article
Field-Weighted Citation Impact
3.77
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article

Initial operations of the Soft X-ray Imager onboard XRISM

Hiroshi Nakajima, Kaito Fujisawa, Kouichi Hagino, Hirokazu Odaka et al.
2 citations
Journal of Astronomical Telescopes Instruments and Systems
Advanced X-ray Imaging Techniques
3.77
article

Initial operations of the Soft X-ray Imager onboard XRISM

Hiroshi Nakajima, Kaito Fujisawa, Kouichi Hagino, Hirokazu Odaka, Shogo Kobayashi, Hideki Uchiyama, Koji Mori, Hirofumi Noda, Yoshiaki Kanemaru, Takayuki Hayashi, Haruhiko Yokosu, Wakana Yonemaru, Kohei K. Shima, Masanori Ozaki, Hironori Matsumoto, Hiromasa Suzuki, Marina Yoshimoto, Yoshitomo Maeda, Hiroyuki Uchida, K. Yamaoka, Yuma Aoki, Junko S. Hiraga, Takaaki Tanaka, Tsunefumi Mizuno, Daiki Aoki, M. Yamauchi, Takeshi Go Tsuru, Masahiro Fukuda, Ryuichi Azuma, Isamu Hatsukade, Hiroshi Murakami, Takashi Okajima, Natsuki Sakamoto, Kumiko Nobukawa, Shun Inoue, Yamato Ito, Masayoshi Nobukawa, T. Yoneyama, Tsukasa Matsushima, Yoshinori Otsuka, Hanako Nakano, Honoka Kiyama, Kaito Fukuda, Tessei Yoshida, H. Tsunemi, Hiroshi Tomida, Mayu Higuchi, M. Ishida, Yasuyuki Shimizu, Takayoshi Kohmura, Kiyoshi Hayashida, Tadayasu Dotani, Kazuhiro Ichikawa, Reo Takemoto, Mio Aoyagi
article en
2 citations

Abstract

X-Ray Imaging and Spectroscopy Mission (XRISM) is an astronomical satellite with the capability of high-resolution spectroscopy with the X-ray microcalorimeter, Resolve, and wide field-of-view imaging with the charge-coupled device (CCD) camera, Xtend. Xtend consists of the mirror assembly (X-ray Mirror Assembly) and detector, Soft X-ray Imager (SXI). The SXI is composed of CCDs, analog and digital electronics, and a mechanical cooler. After the successful launch on September 6, 2023 (UT) and subsequent critical operations, the mission instruments were turned on and set up. The CCDs have been kept at the designed operating temperature of −110°C after the electronics and cooling system were successfully set up. During the initial operation phase, which continued for more than a month after the critical operations, we verified the observation procedure, stability of the cooling system, all the observation options with different imaging areas and/or timing resolutions, and time-tagged and automated operations, including those for South Atlantic Anomaly passages. We optimized the operation procedure and observation parameters, including the cooler settings, imaging areas for the small window modes, and the event selection algorithm. We summarize our policy and procedure of the initial operations for the SXI. We also report on a couple of issues we faced during the initial operations and lessons learned from them.

Journal of Astronomical Telescopes Instruments and SystemsVol. 11(04)
Hiroshima University (JP), University of Miyazaki (JP), Shizuoka University (JP), Goddard Space Flight Center (US), Nara University of Education (JP), Bunkyo University (JP), Konan University (JP), Tokyo University of Science (JP), Tohoku University (JP), Kanto Gakuin University (JP), Kyoto University (JP), Japan Aerospace Exploration Agency (JP), Tohoku Gakuin University (JP), Institute of Space and Astronautical Science (JP), National Astronomical Observatory of Japan (JP), Nagoya University (JP), The University of Tokyo (JP), University of Maryland, Baltimore County (US), Kindai University (JP), Chuo University (JP), The University of Osaka (JP)
Openalex Percentile: Top 9%
Advanced X-ray Imaging Techniques
3.77
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