Development of a cadmium telluride pixel detector for astrophysical applications

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; Tadayuki Takahashi

doi:10.1117/12.825711

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20 August 2009 Development of a cadmium telluride pixel detector for astrophysical applications

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, Tadayuki Takahashi

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Proceedings Volume 7435, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI; 74350Q (2009) https://doi.org/10.1117/12.825711
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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).

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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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