24 July 2014 Thermal design of the hard x-ray imager and the soft gamma-ray detector onboard ASTRO-H
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Abstract
The Hard X-ray Imager and the Soft Gamma-ray Detector, onboard the 6th Japanese X-ray satellite ASTRO-H, aim at unprecedentedly-sensitive observations in the 5–80 keV and 40–600 keV bands, respectively. Because their main sensors are composed of a number of semi-conductor devices, which need to be operated in a temperature of –20 to –15◦C, heat generated in the sensors must be efficiently transported outwards by thermal conduction. For this purpose, we performed thermal design, with the following three steps. First, we additionally included thermally-conductive parts, copper poles and graphite sheets. Second, constructing a thermal mathematical model of the sensors, we estimated temperature distributions in thermal equilibria. Since the model had rather large uncertainties in contact thermal conductions, an accurate thermal dummy was constructed as our final step. Vacuum measurement with the dummy successfully reduced the conductance uncertainties. With these steps, we confirmed that our thermal design of the main sensors satisfies the temperature requirement.
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Hirofumi Noda, Hirofumi Noda, Kazuhiro Nakazawa, Kazuhiro Nakazawa, Kazuo Makishima, Kazuo Makishima, Naoko Iwata, Naoko Iwata, Hiroyuki Ogawa, Hiroyuki Ogawa, Masayuki Ohta, Masayuki Ohta, Goro Sato, Goro Sato, Madoka Kawaharada, Madoka Kawaharada, Shin Watanabe, Shin Watanabe, Motohide Kokubun, Motohide Kokubun, Tadayuki Takahashi, Tadayuki Takahashi, Masanori Ohno, Masanori Ohno, Yasushi Fukazawa, Yasushi Fukazawa, Hiroyasu Tajima, Hiroyasu Tajima, Hideki Uchiyama, Hideki Uchiyama, Shuji Ito, Shuji Ito, Keita Fukuzawa, Keita Fukuzawa, } "Thermal design of the hard x-ray imager and the soft gamma-ray detector onboard ASTRO-H", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445E (24 July 2014); doi: 10.1117/12.2055379; https://doi.org/10.1117/12.2055379
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