Imaging and spectral performance of cdte double-sided strip detectors for the hard x-ray imager onboard ASTRO-H

Kouichi Hagino, Hirokazu Odaka, Goro Sato, Shin Watanabe, Shin'ichiro Takeda, Motohide Kokubun, Taro Fukuyama, Shinya Saito, Tamotsu Sato, Yuto Ichinohe, Tadayuki Takahashi, Toshio Nakano, Kazuhiro Nakazawa, Kazuo Makishima, Hiroyasu Tajima, Takaaki Tanaka, Kazunori Ishibashi, Takuya Miyazawa, Michito Sakai, Karin SakanobeHiroyoshi Kato, Shunya Takizawa, Kentaro Uesugi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Citations (Scopus)


The imaging and spectral performance of CdTe double-sided strip detectors (CdTe-DSDs) was evaluated for the ASTRO-H mission. The charcterized CdTe-DSDs have a strip pitch of 0.25 mm, an imaging area of 3.2 cm×3.2 cm and a thickness of 0.75 mm. The detector was successfully operated at a temperature of -20°C and with an applied bias voltage of 250 V. By using two-strip events as well as one-strip events for the event reconstruction, a good energy resolution of 2.0 keV at 59.5 keV and a sub-strip spatial resolution was achieved. The hard X-ray and gamma-ray response of CdTe-DSDs is complex due to the properties of CdTe and the small pixel effect. Therefore, one of the issues to investigate is the response of the CdTe-DSD. In order to investigate the spatial dependence of the detector response, we performed fine beam scan experiments at SPring-8, a synchrotron radiation facility. From these experiments, the depth structure of the electric field was determined as well as properties of carriers in the detector and successfully reproduced the experimental data with simulated spectra.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2012
Subtitle of host publicationUltraviolet to Gamma Ray
Publication statusPublished - 1 Dec 2012
EventSpace Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray - Amsterdam, Netherlands
Duration: 1 Jul 20126 Jul 2012

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
  • CdTe detector
  • Double-sided strip detector
  • Hard X-ray Imager
  • X-ray/ray astrophysics

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