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Proceedings Paper

Performance of the InFOCμS pixellated CdZnTe detector
Author(s): T. Okajima; J. Tueller; H. A. Krimm; S. D. Barthelmy
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Paper Abstract

InFOCμS is a new generation balloon-borne hard X-ray telescope with focusing optics and spectroscopy in a collaboration between NASA's GSFC and Nagoya University. We had a successful 22.5-hour flight from Fort Sumner, NM on September 16-17, 2004. The InFOCμS hard X-ray telescope consists of a depth-graded platinum-carbon multilayer mirror and a CdZnTe detector, which is a pixellated solid-state device capable of imaging spectroscopy. In this paper, we present the performance of the InFOCμS CdZnTe detector. The detector is configured with a 12 × 12 segmented array of detector pixels. The pixels are 2 mm square, and are placed on 2.1 mm centers. The averaged energy resolution is 4.4 keV at 60 keV and its standard deviation is 0.36 keV over 128 pixels. It has a 241Am tagged source to monitor the energy gain of each detector pixel during the flight. The gain was stable within a few percent during observations. The detector is also surrounded by a 3-cm thick CsI anti-coincidence shield to reduce background from particles and photons not incident along the mirror focal direction. Owing to the active shield, 97.3% of the background was rejected as vetoed events. The observed background rate is 2.9 × 10-4 cts sec-1 cm-2 keV-1 (20-50 keV). We achieved sensitivity as great as 5 × 10-6 cts sec-1 cm-2 keV-1 with 8-hour observations (in 20-50 keV and three sigma detection) in this flight. We also present our plan for the future InFOCμS flights as well as their sensitivity we would expect.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58981M (18 August 2005); doi: 10.1117/12.617893
Show Author Affiliations
T. Okajima, Johns Hopkins Univ. (United States)
NASA Goddard Space Flight Ctr. (United States)
J. Tueller, NASA Goddard Space Flight Ctr. (United States)
H. A. Krimm, Universities Space Research Association (United States)
NASA Goddard Space Flight Ctr. (United States)
S. D. Barthelmy, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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