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Proceedings Paper

Development of an ultra-low-power x-ray-photon-resolving imaging detector array
Author(s): Shunming Sun; Stephen Downey; Stephen Gaalema; James L. Gates; J. Garrett Jernigan; Philip Kaaret; Scott MacIntosh; Brian Ramsey; Bruce Wall
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Paper Abstract

We report on progress to develop and demonstrate CZT and Si hybrid detector arrays for future NASA missions in X-ray and Gamma-ray astronomy. The primary goal for these detectors is consistent with the design concept for the EXIST mission1 and will also be appropriate for other NASA applications and ground-based projects. In particular we target science instruments that have large aperture (multiple square meters) and therefore require a low power ROIC (readout integrated circuits) design (< 10 microwatt per pixel in quiescent mode). The design also must achieve good energy resolution for single photon detection for X rays in the range 5-600 keV with a CZT sense layer and 2-30 keV with a Si sense layer. The target CZT arrays are 2 cm × 2 cm with 600 micron square-shaped pixels. The low power smart pixel detects rare X-ray hits with an adjustable threshold setting. A test array of 7 × 5 pixels with a 5 mm thick CZT sense layer demonstrates that the low power pixel can successfully detect X-rays with ~50 readout noise electrons RMS.

Paper Details

Date Published: 27 August 2010
PDF: 7 pages
Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 78051R (27 August 2010); doi: 10.1117/12.860671
Show Author Affiliations
Shunming Sun, Black Forest Engineering, LLC (United States)
Stephen Downey, Black Forest Engineering, LLC (United States)
Stephen Gaalema, Black Forest Engineering, LLC (United States)
James L. Gates, Black Forest Engineering, LLC (United States)
J. Garrett Jernigan, Univ. of California, Berkeley (United States)
Philip Kaaret, The Univ. of Iowa (United States)
Scott MacIntosh, Black Forest Engineering, LLC (United States)
Brian Ramsey, NASA Marshall Space Flight Ctr. (United States)
Bruce Wall, Black Forest Engineering, LLC (United States)


Published in SPIE Proceedings Vol. 7805:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
Arnold Burger; Larry A. Franks; Ralph B. James, Editor(s)

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