Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector

T. Mizuno, D. Kimura, Y. Fukazawa, S. Furui, K. Goto, T. Hayashi, K. S. Kawabata, T. Kawano, Y. Kitamura, H. Shirakawa, T. Tanabe, K. Makishima, K. Nakajima, K. Nakazawa, T. Fukuyama, Y. Ichinohe, Kosei Ishimura, M. Ohta, T. Sato, T. TakahashiY. Uchida, S. Watanabe, K. Ishibashi, K. Sakanobe, H. Matsumoto, T. Miyazawa, H. Mori, M. Sakai, H. Tajima

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

2 Citations (Scopus)

Abstract

The Soft Gamma-ray Detector (SGD) is a Si/CdTe Compton telescope surrounded by a thick BGO active shield and is scheduled to be onboard the ASTRO-H satellite when it is launched in 2015. The SGD covers the energy range from 40 to 600 keV with high sensitivity, which allows us to study nonthermal phenomena in the universe. The SGD uses a Compton camera with the narrow field-of-view (FOV) concept to reduce the non-Xray background (NXB) and improve the sensitivity. Since the SGD is essentially a nonimaging instrument, it also has to cope with the cosmic X-ray background (CXB) within the FOV. The SGD adopts passive shields called "fine collimators" (FCs) to restrict the FOV to ≤ 0.6° for low-energy photons (≤ 100 keV), which reduces contamination from CXB to less than what is expected due to NXB. Although the FC concept was already adopted by the Hard X-ray Detector onboard Suzaku, FCs for the SGD are about four times larger in size and are technically more difficult to operate. We developed FCs for the SGD and confirmed that the prototypes function as required by subjecting them to an X-ray test and environmental tests, such as vibration tests. We also developed an autocollimator system, which uses visible light to determine the transmittance and the optical axis, and calibrated it against data from the X-ray test. The acceptance tests of flight models started in December 2013: five out of six FCs were deemed acceptable, and one more unit is currently being produced. The activation properties were studied based on a proton-beam test and the results were used to estimate the in-orbit NXB.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2014
Subtitle of host publicationUltraviolet to Gamma Ray
PublisherSPIE
Volume9144
ISBN (Electronic)9780819496126
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes
EventSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray - Montreal
Duration: 2014 Jun 222014 Jun 26

Other

OtherSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
CityMontreal
Period14/6/2214/6/26

Fingerprint

Gamma Rays
collimators
Gamma rays
Calibration
Detector
gamma rays
Detectors
detectors
Field of View
X rays
field of view
x rays
X-ray Detectors
CdTe
Hard X-ray
environmental tests
vibration tests
Acceptance tests
Transmittance
Proton beams

Keywords

  • activation
  • collimator
  • cosmic X-ray background
  • Hard X-rays
  • soft gamma-rays

ASJC Scopus subject areas

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

Cite this

Mizuno, T., Kimura, D., Fukazawa, Y., Furui, S., Goto, K., Hayashi, T., ... Tajima, H. (2014). Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector. In Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray (Vol. 9144). [91445F] SPIE. https://doi.org/10.1117/12.2054649

Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector. / Mizuno, T.; Kimura, D.; Fukazawa, Y.; Furui, S.; Goto, K.; Hayashi, T.; Kawabata, K. S.; Kawano, T.; Kitamura, Y.; Shirakawa, H.; Tanabe, T.; Makishima, K.; Nakajima, K.; Nakazawa, K.; Fukuyama, T.; Ichinohe, Y.; Ishimura, Kosei; Ohta, M.; Sato, T.; Takahashi, T.; Uchida, Y.; Watanabe, S.; Ishibashi, K.; Sakanobe, K.; Matsumoto, H.; Miyazawa, T.; Mori, H.; Sakai, M.; Tajima, H.

Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. Vol. 9144 SPIE, 2014. 91445F.

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

Mizuno, T, Kimura, D, Fukazawa, Y, Furui, S, Goto, K, Hayashi, T, Kawabata, KS, Kawano, T, Kitamura, Y, Shirakawa, H, Tanabe, T, Makishima, K, Nakajima, K, Nakazawa, K, Fukuyama, T, Ichinohe, Y, Ishimura, K, Ohta, M, Sato, T, Takahashi, T, Uchida, Y, Watanabe, S, Ishibashi, K, Sakanobe, K, Matsumoto, H, Miyazawa, T, Mori, H, Sakai, M & Tajima, H 2014, Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector. in Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. vol. 9144, 91445F, SPIE, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, Montreal, 14/6/22. https://doi.org/10.1117/12.2054649
Mizuno T, Kimura D, Fukazawa Y, Furui S, Goto K, Hayashi T et al. Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector. In Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. Vol. 9144. SPIE. 2014. 91445F https://doi.org/10.1117/12.2054649
Mizuno, T. ; Kimura, D. ; Fukazawa, Y. ; Furui, S. ; Goto, K. ; Hayashi, T. ; Kawabata, K. S. ; Kawano, T. ; Kitamura, Y. ; Shirakawa, H. ; Tanabe, T. ; Makishima, K. ; Nakajima, K. ; Nakazawa, K. ; Fukuyama, T. ; Ichinohe, Y. ; Ishimura, Kosei ; Ohta, M. ; Sato, T. ; Takahashi, T. ; Uchida, Y. ; Watanabe, S. ; Ishibashi, K. ; Sakanobe, K. ; Matsumoto, H. ; Miyazawa, T. ; Mori, H. ; Sakai, M. ; Tajima, H. / Development and calibration of fine collimators for the ASTRO-H Soft Gamma-ray Detector. Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. Vol. 9144 SPIE, 2014.
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