Thermal design of the hard x-ray imager and the soft gamma-ray detector onboard ASTRO-H

Hirofumi Noda*, Kazuhiro Nakazawa, Kazuo Makishima, Naoko Iwata, Hiroyuki Ogawa, Masayuki Ohta, Goro Sato, Madoka Kawaharada, Shin Watanabe, Motohide Kokubun, Masanori Ohno, Yasushi Fukazawa, Hiroyasu Tajima, Hideki Uchiyama, Shuji Ito, Keita Fukuzawa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


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 -15â-▪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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
ISBN (Print)9780819496126
Publication statusPublished - 2014
EventSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray - Montreal
Duration: 2014 Jun 222014 Jun 26


OtherSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray


  • ASTRO-H.
  • gamma-ray
  • graphite sheet
  • semiconductor detector
  • thermal design
  • X-ray

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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