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

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 publicationSpace Telescopes and Instrumentation 2014
Subtitle of host publicationUltraviolet to Gamma Ray
EditorsTadayuki Takahashi, Jan-Willem A. den Herder, Mark Bautz
ISBN (Electronic)9780819496126
Publication statusPublished - 2014
Externally publishedYes
EventSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray - Montreal, Canada
Duration: 2014 Jun 222014 Jun 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray


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

ASJC Scopus subject areas

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


Dive into the research topics of 'Thermal design of the hard x-ray imager and the soft gamma-ray detector onboard ASTRO-H'. Together they form a unique fingerprint.

Cite this