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Fine-Pitch CdTe Detector for Hard X-Ray Imaging and Spectroscopy of the Sun with the FOXSI Rocket ExperimentWe have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics Solar X-ray Imager (FOXSI). FOXSI is a rocket experiment to perform high sensitivity HXR observations from 4 to 15 keV using the new technique of HXR focusing optics. The focal plane detector requires less than 100 micrometers position resolution (to take advantage of the angular resolution of the optics) and approximately equals 1 keV energy resolution (full width at half maximum (FWHM)) for spectroscopy down to 4 keV, with moderate cooling (greater than -30 C). Double-sided silicon strip detectors were used for the first FOXSI flight in 2012 to meet these criteria. To improve the detectors' efficiency (66% at 15 keV for the silicon detectors) and position resolution of 75 micrometers for the second launch, we fabricated double-sided CdTe strip detectors with a position resolution of 60 micrometers and almost 100% efficiency for the FOXSI energy range. The sensitive area is 7.67 mm x 7.67 mm, corresponding to the field of view of 791'' x 791''. An energy resolution of 1 keV (FWHM) and low-energy threshold of approximately equals 4 keV were achieved in laboratory calibrations. The second launch of FOXSI was performed on 11 December 2014, and images from the Sun were successfully obtained with the CdTe detector. Therefore, we successfully demonstrated the detector concept and the usefulness of this technique for future HXR observations of the Sun.
Document ID
20170003198
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ishikawa, Shin-nosuke (Japan Aerospace Exploration Agency Sagamihara, Japan)
Katsuragawa, Miho (Japan Aerospace Exploration Agency Sagamihara, Japan)
Watanabe, Shin (Japan Aerospace Exploration Agency Sagamihara, Japan)
Uchida, Yuusuke (Japan Aerospace Exploration Agency Sagamihara, Japan)
Takeda, Shin'lchiro (Okinawa Institute of Science and Technology Graduate University (OIST) Okinawa, Japan)
Takahashi, Tadayuki (Japan Aerospace Exploration Agency Sagamihara, Japan)
Saito, Shinya (Rikkyo Univ. Yokosuka, Japan)
Glesener, Lindsay (Minnesota Univ. Minneapolis, MN, United States)
Bultrago-Casas, Juan Camilo (California Univ. Berkeley, CA, United States)
Krucker, Sam (California Univ. Berkeley, CA, United States)
Christe, Steven (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
April 7, 2017
Publication Date
July 5, 2016
Publication Information
Publication: Journal of Geophysical Research: Space Physics
Volume: 121
Issue: 7
ISSN: 2169-9380
Subject Category
Astrophysics
Instrumentation and Photography
Report/Patent Number
GSFC-E-DAA-TN40856
Funding Number(s)
CONTRACT_GRANT: KAKENHI 24244021
CONTRACT_GRANT: NNX11AB75G
CONTRACT_GRANT: KAKENHI 24105007
CONTRACT_GRANT: KAKENHI 20244017
Distribution Limits
Public
Copyright
Other