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Soft X-ray Imager of the Xtend system onboard XRISM

Fuente: arXiv

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Main Authors:	Noda, Hirofumi, Mori, Koji, Tomida, Hiroshi, Nakajima, Hiroshi, Tanaka, Takaaki, Murakami, Hiroshi, Uchida, Hiroyuki, Suzuki, Hiromasa, Kobayashi, Shogo Benjamin, Yoneyama, Tomokage, Hagino, Kouichi, Nobukawa, Kumiko, Uchiyama, Hideki, Nobukawa, Masayoshi, Matsumoto, Hironori, Tsuru, Takeshi Go, Yamauchi, Makoto, Hatsukade, Isamu, Odaka, Hirokazu, Kohmura, Takayoshi, Yamaoka, Kazutaka, Yoshida, Tessei, Kanemaru, Yoshiaki, Hiraga, Junko, Dotani, Tadayasu, Ozaki, Masanobu, Tsunemi, Hiroshi, Sato, Jin, Takaki, Toshiyuki, Terada, Yuta, Miyazaki, Keitaro, Kusunoki, Kohei, Otsuka, Yoshinori, Yokosu, Haruhiko, Yonemaru, Wakana, Ichikawa, Kazuhiro, Nakano, Hanako, Takemoto, Reo, Matsushima, Tsukasa, Urase, Reika, Kurashima, Jun, Fuchi, Kotomi, Hayakawa, Kaito, Fukuda, Masahiro, Kamei, Takamitsu, Asahina, Yoh, Inoue, Shun, Yuki, Amano, Aoki, Yuma, Ito, Yamato, Kamatani, Tomoya, Takayama, Kouta, Sako, Takashi, Yoshimoto, Marina, Shima, Kohei, Higuchi, Mayu, Ninoyu, Kaito, Aoki, Daiki, Tsunomachi, Shun, Hayashida, Kiyoshi
Format:	Preprint
Published:	2025
Subjects:	Instrumentation and Methods for Astrophysics
Online Access:	Acceder al recurso
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_version_	1866912229881806848
author	Noda, Hirofumi Mori, Koji Tomida, Hiroshi Nakajima, Hiroshi Tanaka, Takaaki Murakami, Hiroshi Uchida, Hiroyuki Suzuki, Hiromasa Kobayashi, Shogo Benjamin Yoneyama, Tomokage Hagino, Kouichi Nobukawa, Kumiko Uchiyama, Hideki Nobukawa, Masayoshi Matsumoto, Hironori Tsuru, Takeshi Go Yamauchi, Makoto Hatsukade, Isamu Odaka, Hirokazu Kohmura, Takayoshi Yamaoka, Kazutaka Yoshida, Tessei Kanemaru, Yoshiaki Hiraga, Junko Dotani, Tadayasu Ozaki, Masanobu Tsunemi, Hiroshi Sato, Jin Takaki, Toshiyuki Terada, Yuta Miyazaki, Keitaro Kusunoki, Kohei Otsuka, Yoshinori Yokosu, Haruhiko Yonemaru, Wakana Ichikawa, Kazuhiro Nakano, Hanako Takemoto, Reo Matsushima, Tsukasa Urase, Reika Kurashima, Jun Fuchi, Kotomi Hayakawa, Kaito Fukuda, Masahiro Kamei, Takamitsu Asahina, Yoh Inoue, Shun Yuki, Amano Aoki, Yuma Ito, Yamato Kamatani, Tomoya Takayama, Kouta Sako, Takashi Yoshimoto, Marina Shima, Kohei Higuchi, Mayu Ninoyu, Kaito Aoki, Daiki Tsunomachi, Shun Hayashida, Kiyoshi
author_facet	Noda, Hirofumi Mori, Koji Tomida, Hiroshi Nakajima, Hiroshi Tanaka, Takaaki Murakami, Hiroshi Uchida, Hiroyuki Suzuki, Hiromasa Kobayashi, Shogo Benjamin Yoneyama, Tomokage Hagino, Kouichi Nobukawa, Kumiko Uchiyama, Hideki Nobukawa, Masayoshi Matsumoto, Hironori Tsuru, Takeshi Go Yamauchi, Makoto Hatsukade, Isamu Odaka, Hirokazu Kohmura, Takayoshi Yamaoka, Kazutaka Yoshida, Tessei Kanemaru, Yoshiaki Hiraga, Junko Dotani, Tadayasu Ozaki, Masanobu Tsunemi, Hiroshi Sato, Jin Takaki, Toshiyuki Terada, Yuta Miyazaki, Keitaro Kusunoki, Kohei Otsuka, Yoshinori Yokosu, Haruhiko Yonemaru, Wakana Ichikawa, Kazuhiro Nakano, Hanako Takemoto, Reo Matsushima, Tsukasa Urase, Reika Kurashima, Jun Fuchi, Kotomi Hayakawa, Kaito Fukuda, Masahiro Kamei, Takamitsu Asahina, Yoh Inoue, Shun Yuki, Amano Aoki, Yuma Ito, Yamato Kamatani, Tomoya Takayama, Kouta Sako, Takashi Yoshimoto, Marina Shima, Kohei Higuchi, Mayu Ninoyu, Kaito Aoki, Daiki Tsunomachi, Shun Hayashida, Kiyoshi
contents	The Soft X-ray Imager (SXI) is the X-ray charge-coupled device (CCD) camera for the soft X-ray imaging telescope Xtend installed on the X-ray Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission for the Hitomi X-ray satellite and was successfully launched on 2023 September 7 (JST). In order to maximize the science output of XRISM, we set the requirements for Xtend and find that the CCD set employed in the Hitomi/SXI or similar, i.e., a $2 \times 2$ array of back-illuminated CCDs with a $200~μ$m-thick depletion layer, would be practically best among available choices, when used in combination with the X-ray mirror assembly. We design the XRISM/SXI, based on the Hitomi/SXI, to have a wide field of view of $38' \times 38'$ in the $0.4-13$ keV energy range. We incorporated several significant improvements from the Hitomi/SXI into the CCD chip design to enhance the optical-light blocking capability and to increase the cosmic-ray tolerance, reducing the degradation of charge-transfer efficiency in orbit. By the time of the launch of XRISM, the imaging and spectroscopic capabilities of the SXI has been extensively studied in on-ground experiments with the full flight-model configuration or equivalent setups and confirmed to meet the requirements. The optical blocking capability, the cooling and temperature control performance, and the transmissivity and quantum efficiency to incident X-rays of the CCDs are also all confirmed to meet the requirements. Thus, we successfully complete the pre-flight development of the SXI for XRISM.
format	Preprint
id	arxiv_https___arxiv_org_abs_2502_08030
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Soft X-ray Imager of the Xtend system onboard XRISM Noda, Hirofumi Mori, Koji Tomida, Hiroshi Nakajima, Hiroshi Tanaka, Takaaki Murakami, Hiroshi Uchida, Hiroyuki Suzuki, Hiromasa Kobayashi, Shogo Benjamin Yoneyama, Tomokage Hagino, Kouichi Nobukawa, Kumiko Uchiyama, Hideki Nobukawa, Masayoshi Matsumoto, Hironori Tsuru, Takeshi Go Yamauchi, Makoto Hatsukade, Isamu Odaka, Hirokazu Kohmura, Takayoshi Yamaoka, Kazutaka Yoshida, Tessei Kanemaru, Yoshiaki Hiraga, Junko Dotani, Tadayasu Ozaki, Masanobu Tsunemi, Hiroshi Sato, Jin Takaki, Toshiyuki Terada, Yuta Miyazaki, Keitaro Kusunoki, Kohei Otsuka, Yoshinori Yokosu, Haruhiko Yonemaru, Wakana Ichikawa, Kazuhiro Nakano, Hanako Takemoto, Reo Matsushima, Tsukasa Urase, Reika Kurashima, Jun Fuchi, Kotomi Hayakawa, Kaito Fukuda, Masahiro Kamei, Takamitsu Asahina, Yoh Inoue, Shun Yuki, Amano Aoki, Yuma Ito, Yamato Kamatani, Tomoya Takayama, Kouta Sako, Takashi Yoshimoto, Marina Shima, Kohei Higuchi, Mayu Ninoyu, Kaito Aoki, Daiki Tsunomachi, Shun Hayashida, Kiyoshi Instrumentation and Methods for Astrophysics The Soft X-ray Imager (SXI) is the X-ray charge-coupled device (CCD) camera for the soft X-ray imaging telescope Xtend installed on the X-ray Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission for the Hitomi X-ray satellite and was successfully launched on 2023 September 7 (JST). In order to maximize the science output of XRISM, we set the requirements for Xtend and find that the CCD set employed in the Hitomi/SXI or similar, i.e., a $2 \times 2$ array of back-illuminated CCDs with a $200~μ$m-thick depletion layer, would be practically best among available choices, when used in combination with the X-ray mirror assembly. We design the XRISM/SXI, based on the Hitomi/SXI, to have a wide field of view of $38' \times 38'$ in the $0.4-13$ keV energy range. We incorporated several significant improvements from the Hitomi/SXI into the CCD chip design to enhance the optical-light blocking capability and to increase the cosmic-ray tolerance, reducing the degradation of charge-transfer efficiency in orbit. By the time of the launch of XRISM, the imaging and spectroscopic capabilities of the SXI has been extensively studied in on-ground experiments with the full flight-model configuration or equivalent setups and confirmed to meet the requirements. The optical blocking capability, the cooling and temperature control performance, and the transmissivity and quantum efficiency to incident X-rays of the CCDs are also all confirmed to meet the requirements. Thus, we successfully complete the pre-flight development of the SXI for XRISM.
title	Soft X-ray Imager of the Xtend system onboard XRISM
topic	Instrumentation and Methods for Astrophysics
url	https://arxiv.org/abs/2502.08030