The Hard X-ray Imager (HXI) for the ASTRO-H mission

Motohide Kokubun*, Kazuhiro Nakazawa, Teruaki Enoto, Yasushi Fukazawa, Jun Kataoka, Madoka Kawaharada, Philippe Laurent, Francois Lebrun, Olivier Limousin, Kazuo Makishima, Tsunefumi Mizuno, Kunishiro Mori, Takeshi Nakamori, Hirokazu Odaka, Masanori Ohno, Masayuki Ohta, Goro Sato, Rie Sato, Hiroyasu Tajima, Hiromitsu TakahashiTadayuki Takahashi, Takaaki Tanaka, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Yoichi Yatsu, Takayuki Yuasa

*Corresponding author for this work

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

31 Citations (Scopus)


The Hard X-ray Imager (HXI) is one of the four detectors on board the ASTRO-H mission (6th Japanese X-ray satellite), which is scheduled to be launched in 2014. Using the hybrid structure composed of double-sided silicon strip detectors and a cadmium telluride double-sided strip detector, both with a high spatial resolution of 250 μm. Combined with the hard X-ray telescope (HXT), it consists a hard X-ray imaging spectroscopic instrument covering the energy range from 5 to 80 keV with an effective area of >300 cm2 in total at 30 keV. An energy resolution of 1-2 keV (FWHM) and lower threshold of 5 keV are both achieved with using a low noise front-end ASICs. In addition, the thick BGO active shields surrounding the main detector package is a heritage of the successful performance of the Hard X-ray Detector on board the Suzaku satellite. This feature enables the instrument to achieve an extremely good reduction of background caused by cosmic-ray particles, cosmic X-ray background, and in-orbit radiation activation. In this paper, we present the detector concept, design, latest results of the detector development, and the current status of the hardware.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2012
Subtitle of host publicationUltraviolet to Gamma Ray
Publication statusPublished - 2012
EventSpace Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray - Amsterdam, Netherlands
Duration: 2012 Jul 12012 Jul 6

Publication series

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


ConferenceSpace Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray


  • ASTRO-H mission
  • Hard X-ray Imager
  • X-ray Astronomy

ASJC Scopus subject areas

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


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