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20 August 2009 Development of a cadmium telluride pixel detector for astrophysical applications
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Abstract
We are developing imaging Cadmium Telluride (CdTe) pixel detectors optimized for astrophysical hard X-ray applications. Our hybrid detector consist of a CdTe crystal 1mm thick and 2cm × 2cm in area with segmented anode contacts directly bonded to a custom low-noise application specific integrated circuit (ASIC). The CdTe sensor, fabricated by ACRORAD (Okinawa, Japan), has Schottky blocking contacts on a 605 micron pitch in a 32 × 32 array, providing low leakage current and enabling readout of the anode side. The detector is bonded using epoxy-gold stud interconnects to a custom low noise, low power ASIC circuit developed by Caltech's Space Radiation Laboratory. We have achieved very good energy resolution over a wide energy range (0.62keV FWHM @ 60keV, 10.8keV FWHM @ 662keV). We observe polarization effects at room temperature, but they are suppressed if we operate the detector at or below 0°C degree. These detectors have potential application for future missions such as the International X-ray Observatory (IXO).
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiromasa Miyasaka, Fiona A. Harrison, Walter R. Cook, Peter H. Mao, Vikram R. Rana, Shin-nosuke Ishikawa, Masayoshi Ushio, Hiroyuki Aono, Shin Watanabe, Goro Sato, Motohide Kokubun, and Tadayuki Takahashi "Development of a cadmium telluride pixel detector for astrophysical applications", Proc. SPIE 7435, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI, 74350Q (20 August 2009); https://doi.org/10.1117/12.825711
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Cited by 3 scholarly publications.
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KEYWORDS
Sensors

X-rays

Polarization

X-ray detectors

Cadmium

Hard x-rays

Space telescopes

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