Development of an ultra-low-power x-ray-photon-resolving imaging detector array

Shunming Sun; Stephen Downey; Stephen Gaalema; James L. Gates; J. Garrett Jernigan; Philip Kaaret; Scott MacIntosh; Brian Ramsey; Bruce Wall

doi:10.1117/12.860671

27 August 2010 Development of an ultra-low-power x-ray-photon-resolving imaging detector array

Shunming Sun, Stephen Downey, Stephen Gaalema, James L. Gates, J. Garrett Jernigan, Philip Kaaret, Scott MacIntosh, Brian Ramsey, Bruce Wall

Author Affiliations +

Proceedings Volume 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII; 78051R (2010) https://doi.org/10.1117/12.860671
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

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.

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Shunming Sun, Stephen Downey, Stephen Gaalema, James L. Gates, J. Garrett Jernigan, Philip Kaaret, Scott MacIntosh, Brian Ramsey, and Bruce Wall "Development of an ultra-low-power x-ray-photon-resolving imaging detector array", Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 78051R (27 August 2010); https://doi.org/10.1117/12.860671

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