Development of a wide-band gamma-ray camera onboard a 50 kg-Class small satellite GRAPHIUM
Abstract Currently, more than 300 satellites are under development worldwide, some of which are dedicated to advancing space science. Waseda University and Science Tokyo are developing “GRAPHIUM”, a 50 kg-Class small satellite scheduled for launch in FY2026. The satellite aims to expand MeV gamma-ray astronomy, which has stagnated for over 30 years. The primary detector of the satellite, INSPIRE, is a box-type Compton camera designed to cover a dynamic range spanning over two orders of magnitude. It operates in pinhole mode for low-energy observations (30–200 keV) and in Compton mode for high-energy detection (200 keV–3 MeV). The Compton camera box (CC-BOX) is composed of pixelated Ce-doped Gd 3 Al 2 Ga 3 O 12 (GAGG) scintillators coupled with a multi-pixel photon counter (MPPC) array. It is enclosed by Bi 4 Ge 3 O 12 (BGO) active shields. The design of the CC-BOX has been finalized, and an engineering model (EM) equipped with actual sensors has been developed. This study presents the results of wide-band imaging performed using the EM and discuss its performance in terms of energy and angular resolution. Additionally, vibration tests were conducted using the EM, and the results are discussed in detail.
Authors
- Y. Arai (ORCID: https://orcid.org/0000-0002-1454-2287)
- K. Tashiro (ORCID: https://orcid.org/0000-0003-2133-7115)
- Kazuya Otsubo (ORCID: https://orcid.org/0000-0003-4688-2822)
- Tadatomo Suga (ORCID: https://orcid.org/0000-0002-1029-0326)
- Daisuke Yoshimura
- Anjali Joshi (ORCID: https://orcid.org/0000-0002-7841-2326)
- Takashi Tomura (ORCID: https://orcid.org/0000-0002-9272-8298)
- Hibiki Yoshida
- H. Seki (ORCID: https://orcid.org/0000-0002-8169-4838)
- Kei Yamamoto (ORCID: https://orcid.org/0000-0001-5881-7521)
- Yoichi Yatsu (ORCID: https://orcid.org/0000-0003-1890-3913)
- Yuko Kawaguchi (ORCID: https://orcid.org/0000-0002-5366-2847)
- Kiyona Miyamoto (ORCID: https://orcid.org/0000-0002-4242-4974)
- Koji Tanaka (ORCID: https://orcid.org/0000-0001-5178-9388)
- Kentaro Watanabe (ORCID: https://orcid.org/0000-0002-9104-7458)
- T. Kanda (ORCID: https://orcid.org/0000-0003-4626-387X)
- Masazumi Onishi (ORCID: https://orcid.org/0000-0002-1924-5732)
- Daisuke Kobayashi (ORCID: https://orcid.org/0000-0002-0140-8820)
- Toshihiro Chujo (ORCID: https://orcid.org/0000-0001-5739-3982)
- Hideo Nakanishi (ORCID: https://orcid.org/0000-0002-0158-8278)
- J. Kataoka (ORCID: https://orcid.org/0000-0003-2819-6415)
- Yasuhiro Ozeki (ORCID: https://orcid.org/0000-0002-2782-6158)
- Ryoko Mori (ORCID: https://orcid.org/0009-0000-6217-774X)
- M. Fukuda
- Seiichi Takeda
- Shigeaki Joshima
- S. Hayatsu
- Masaru YASUDA
- S. Ogasawara
- Yoshikiyo Amaki
- H. Kobayashi
- Kouhei Takahashi (ORCID: https://orcid.org/0000-0002-2588-8427)
Institutions
- Tokyo Institute of Technology (JP)
- Waseda University (JP)
- Shibuya (Japan) (JP)
Publication Details
- Journal
- Journal of Instrumentation
- Published
- 2025-09-01
- DOI
- https://doi.org/10.1088/1748-0221/20/09/c09005
- Citations
- 1
- Primary Topic
- Gamma-ray bursts and supernovae
- Type
- article
- Field-Weighted Citation Impact
- 1.15