On-ground calibration of the Hitomi Hard X-ray Telescopes

Hideyuki Mori; Takuya Miyazawa; Hisamitsu Awaki; Hironori Matsumoto; Yasunori Babazaki; Ayako Bandai; Tadatsugu Demoto; Akihiro Furuzawa; Yoshito Haba; Takayuki Hayashi; Ryo Iizuka; Kazunori Ishibashi; Manabu Ishida; Naoki Ishida; Masayuki Itoh; Toshihiro Iwase; Hiroyoshi Kato; Hiroaki Kobayashi; Tatsuro Kosaka; Hideyo Kunieda; Shou Kurashima; Daichi Kurihara; Yuuji Kuroda; Yoshitomo Maeda; Yoshifumi Meshino; Ikuyuki Mitsuishi; Yusuke Miyata; Hosei Nagano; Yoshiharu Namba; Yasushi Ogasaka; Keiji Ogi; Takashi Okajima; Shigetaka Saji; Fumiya Shimasaki; Takuro Sato; Toshiki Sato; Naotsugu Shima; Satoshi Sugita; Yoshio Suzuki; Kenji Tachibana; Sasagu Tachibana; Shunya Takizawa; Keisuke Tamura; Yuzuru Tawara; Kazuki Tomikawa; Tatsuharu Torii; Kentaro Uesugi; Koujun Yamashita; Shigeo Yamauchi

doi:10.1117/1.JATIS.4.1.011210

27 January 2018 On-ground calibration of the Hitomi Hard X-ray Telescopes

Hideyuki Mori, Takuya Miyazawa, Hisamitsu Awaki, Hironori Matsumoto, Yasunori Babazaki, Ayako Bandai, Tadatsugu Demoto, Akihiro Furuzawa, Yoshito Haba, Takayuki Hayashi, Ryo Iizuka, Kazunori Ishibashi, Manabu Ishida, Naoki Ishida, Masayuki Itoh, Toshihiro Iwase, Hiroyoshi Kato, Hiroaki Kobayashi, Tatsuro Kosaka, Hideyo Kunieda, Shou Kurashima, Daichi Kurihara, Yuuji Kuroda, Yoshitomo Maeda, Yoshifumi Meshino, Ikuyuki Mitsuishi, Yusuke Miyata, Hosei Nagano, Yoshiharu Namba, Yasushi Ogasaka, Keiji Ogi, Takashi Okajima, Shigetaka Saji, Fumiya Shimasaki, Takuro Sato, Toshiki Sato, Naotsugu Shima, Satoshi Sugita, Yoshio Suzuki, Kenji Tachibana, Sasagu Tachibana, Shunya Takizawa, Keisuke Tamura, Yuzuru Tawara, Kazuki Tomikawa, Tatsuharu Torii, Kentaro Uesugi, Koujun Yamashita, Shigeo Yamauchi

Author Affiliations +

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 1, 011210 (January 2018). https://doi.org/10.1117/1.JATIS.4.1.011210

Abstract

We present x-ray characteristics of the Hard X-ray Telescopes (HXTs) on board the Hitomi (ASTRO-H) satellite. Measurements were conducted at the SPring-8 BL20B2 beamline and the ISAS/JAXA 27-m beamline. The angular resolution defined by a half-power diameter was 1.9′ (HXT-1) and 2.1′ (HXT-2) at 8 keV, 1.9′ at 30 keV, and 1.8′ at 50 keV. The effective area was found to be 620 cm² at 8 keV, 178 cm² at 30 keV, and 82 cm² at 50 keV per mirror module. Although the angular resolutions were slightly worse than the requirement (1.7′), the effective areas sufficiently exceeded the requirements of 150 cm² at 30 keV and 55 cm² at 50 keV. The off-axis measurements of the effective areas resulted in the field of view being 6.1′ at 50 keV, 7.7′ at 30 keV, and 9.7′ at 8 keV in diameter. We confirmed that the main component of the stray x-ray light was significantly reduced by mounting the precollimator as designed. Detailed analysis of the data revealed that the angular resolution was degraded mainly by figure errors of mirror foils, and the angular resolution is completely explained by the figure errors, positioning errors of the foils, and conical approximation of the foil shape. We found that the effective areas were ∼80 % of the designed values below 40 keV, whereas they steeply decline above 40 keV and become only ∼50 % . We investigated this abrupt decline and found that neither the error of the multilayer design nor the errors of the incident angles induced by the positioning errors of the foils can be the cause. The reflection profile of each foil pair from the defocused image strongly suggests that the figure errors of the foils probably bring about the reduction in the effective areas at higher energies.

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Hideyuki Mori, Takuya Miyazawa, Hisamitsu Awaki, Hironori Matsumoto, Yasunori Babazaki, Ayako Bandai, Tadatsugu Demoto, Akihiro Furuzawa, Yoshito Haba, Takayuki Hayashi, Ryo Iizuka, Kazunori Ishibashi, Manabu Ishida, Naoki Ishida, Masayuki Itoh, Toshihiro Iwase, Hiroyoshi Kato, Hiroaki Kobayashi, Tatsuro Kosaka, Hideyo Kunieda, Shou Kurashima, Daichi Kurihara, Yuuji Kuroda, Yoshitomo Maeda, Yoshifumi Meshino, Ikuyuki Mitsuishi, Yusuke Miyata, Hosei Nagano, Yoshiharu Namba, Yasushi Ogasaka, Keiji Ogi, Takashi Okajima, Shigetaka Saji, Fumiya Shimasaki, Takuro Sato, Toshiki Sato, Naotsugu Shima, Satoshi Sugita, Yoshio Suzuki, Kenji Tachibana, Sasagu Tachibana, Shunya Takizawa, Keisuke Tamura, Yuzuru Tawara, Kazuki Tomikawa, Tatsuharu Torii, Kentaro Uesugi, Koujun Yamashita, and Shigeo Yamauchi "On-ground calibration of the Hitomi Hard X-ray Telescopes," Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 011210 (27 January 2018). https://doi.org/10.1117/1.JATIS.4.1.011210

Received: 15 August 2017; Accepted: 18 December 2017; Published: 27 January 2018

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