Hard X-ray imager for the NeXT mission

Kazuhiro Nakazawa*, Yasushi Fukazawa, Tuneyoshi Kamae, Jun Kataoka, Motohide Kokubun, Kazuo Makishima, Tsunefumi Mizuno, Toshio Murakami, Masaharu Nomachi, Hiroyasu Tajima, Tadayuki Takahashi, Makoto Tashiro, Toru Tamagawa, Yukikatsu Terada, Shin Watanabe, Kazutaka Yamaoka, Daisuke Yonetoku

*Corresponding author for this work

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

15 Citations (Scopus)


The hard X-ray imager (HXI) is the primary detector of the NeXT mission, proposed to explore high-energy non-thermal phenomena in the universe. Combined with a novel hard X-ray mirror optics, the HXI is designed to provide better than arc-minutes imaging capability with 1 keV level spectroscopy, and more than 30 times higher sensitivity compared with any existing hard X-ray instruments. The base-line design of the HXI is improving to secure high sensitivity. The key is to reduce the detector background as far as possible. Based on the experience of the Suzaku satellite launched in July 2005, the current design has a well-type tight active shield and multi layered, multi material imaging detector made of Si and CdTe. Technology has been under development for a few years so that we have reached the level where a basic detector performance is satisfied. Design tuning to further improve the sensitivity and reliability is on-going.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation II
Subtitle of host publicationUltraviolet to Gamma Ray
Publication statusPublished - 2006
Externally publishedYes
EventSpace Telescopes and Instrumentation II: Ultraviolet to Gamma Ray - Orlando, FL, United States
Duration: 2006 May 242006 May 31

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6266 II
ISSN (Print)0277-786X


ConferenceSpace Telescopes and Instrumentation II: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
CityOrlando, FL


  • CdTe
  • DSSD
  • Hard X-ray
  • 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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