Concept of the wide-band hybrid x-ray imager for the FORCE mission

Kazuhiro Nakazawa; Koji Mori; Takeshi Go Tsuru; Yoshihiro Ueda; Manabu Ishida; Takaaki Tanaka; Hironori Matsumoto; Hisamitsu Awaki; Hiroshi Murakami; Masayoshi Nobukawa; Ayaki Takeda; Shin Watanabe; Yasushi Fukazawa; Hiroshi Tsunemi; Tadayuki Takahashi; Ann E. Hornschemeier; Takashi Okajima; William W. Zhang; Brian J. Williams

doi:10.1117/12.2560493

13 December 2020 Concept of the wide-band hybrid x-ray imager for the FORCE mission

Kazuhiro Nakazawa, Koji Mori, Takeshi Go Tsuru, Yoshihiro Ueda, Manabu Ishida, Takaaki Tanaka, Hironori Matsumoto, Hisamitsu Awaki, Hiroshi Murakami, Masayoshi Nobukawa, Ayaki Takeda, Shin Watanabe, Yasushi Fukazawa, Hiroshi Tsunemi, Tadayuki Takahashi, Ann E. Hornschemeier, Takashi Okajima, William W. Zhang, Brian J. Williams

Author Affiliations +

Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 114445J (2020) https://doi.org/10.1117/12.2560493
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

FORCE (Focusing On Relativistic universe and Cosmic Evolution) is a future Japan-lead X-ray mission in study to achieve wide-band (1-80 keV) coverage with good (15’’ half-power-diameter, HPD) angular resolution, to uncover high energy phenomena currently difficult to access because of strong absorption and/or overlaid thermal emission. The science instrument onboard FORCE is a pair of high-resolution super-mirrors, and wide-band imaging spectrometers, placed with a focal length distance of 12 m. WHXI is designed to achieve high sensitivity, and therefore low background level of 1-3 x 10-3 counts s^-1 cm^-2. Low and stable background is important especially for diffuse source analysis, and it also contributes to achieve good sensitivity against dim point sources. With this aim, the basic concept of FORCE/WHXI is based on Hitomi/HXI heritage, which has achieved the lowest ever background in 5 to ~30 keV band in orbit. The imager is made of a hybrid X-ray imager and active shield surrounding it. The former consists of a newly developed Si imager (XRPIX) to cover 1-25 keV, and a CdTe imager (CdTe-DSD, a heritage of Hitomi/HXI), to cover 20-80 keV, stacked in tandem. The active shield is made of 3-4 cm thick BGO scintillator crystal covering almost 4-pi radian around the imagers. Lessons learned from both NuSTAR FPMA and Hitomi/HXI will be incorporated in WHXI.

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Kazuhiro Nakazawa, Koji Mori, Takeshi Go Tsuru, Yoshihiro Ueda, Manabu Ishida, Takaaki Tanaka, Hironori Matsumoto, Hisamitsu Awaki, Hiroshi Murakami, Masayoshi Nobukawa, Ayaki Takeda, Shin Watanabe, Yasushi Fukazawa, Hiroshi Tsunemi, Tadayuki Takahashi, Ann E. Hornschemeier, Takashi Okajima, William W. Zhang, and Brian J. Williams "Concept of the wide-band hybrid x-ray imager for the FORCE mission", Proc. SPIE 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray, 114445J (13 December 2020); https://doi.org/10.1117/12.2560493

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