24 July 2014 Recent progress in the ground calibration of the ASTRO-H Hard X-ray telescope (HXT-2)
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Abstract
The 6th Japanese X-ray satellite, ASTRO-H, equips two Hard X-ray Telescopes (HXTs) to perform imaging spectroscopy up to 70 keV. The 2nd flight module (HXT-2) had been completed in July, 2013. After some environmental tests were passed, the X-ray performance of the HXT-2 was measured at the SPring-8 BL20B2, 3rd generation synchrotron facility. The angular resolution defined with a Half Power Diameter (HPD) was 1:′9 at 30 keV and 1:′8 at 50 keV. This small energy dependence is considered to be caused by the difference in image quality of each foil; the inner mirror shells have better quality than outer ones. The effective area was found to be 178 cm2 at 30 keV and 82 cm2 at 50 keV, both of which exceed the requirement. Furthermore, the detailed energy dependence of the effective area was examined for a limited aperture in the 30{70 keV band with a pitch of 1 keV. We also measured the off-axis dependence of the effective area at 50 keV, and then determined the optical axis. The field of view of the HXT-2 was found to be 5:′6 (FWHM of the vignetting function), consistent with the simulation. In this paper, we also report the detailed analysis of the ground calibration data, which will be used for image reconstruction by a ray-tracing simulator.
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Hideyuki Mori, Hideyuki Mori, Yuji Kuroda, Yuji Kuroda, Takuya Miyazawa, Takuya Miyazawa, Hisamitsu Awaki, Hisamitsu Awaki, Yasunori Babazaki, Yasunori Babazaki, Akihiro Furuzawa, Akihiro Furuzawa, Tatsuya Hibino, Tatsuya Hibino, Ryo Iizuka, Ryo Iizuka, Kazunori Ishibashi, Kazunori Ishibashi, Toshihiro Iwase, Toshihiro Iwase, Hideyo Kunieda, Hideyo Kunieda, Daichi Kurihara, Daichi Kurihara, Hironori Matsumoto, Hironori Matsumoto, Yusuke Miyata, Yusuke Miyata, Shigetaka Saji, Shigetaka Saji, Satoshi Sugita, Satoshi Sugita, Yoshio Suzuki, Yoshio Suzuki, Sasagu Tachibana, Sasagu Tachibana, Keisuke Tamura, Keisuke Tamura, Yuzuru Tawara, Yuzuru Tawara, Kentaro Uesugi, Kentaro Uesugi, } "Recent progress in the ground calibration of the ASTRO-H Hard X-ray telescope (HXT-2)", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 914457 (24 July 2014); doi: 10.1117/12.2055656; https://doi.org/10.1117/12.2055656
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