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Wide-field hard x-ray survey telescope: ProtoEXIST1

Hong, J. and Grindlay, J. E. and Chammas, N. and Allen, B. and Copete, A. and Said, B. and Burke, M. and Howell, J. and Gauron, T. and Baker, R. G. and Barthelmy, S. D. and Sheikh, S. and Gehrels, N. and Cook, W. R. and Burnham, J. A. and Harrison, F. A. and Collins, J. and Labov, S. and Garson, A., III and Krawczynski, H. (2007) Wide-field hard x-ray survey telescope: ProtoEXIST1. In: Hard X-Ray and Gamma-Ray Detector Physics IX. Proceedings of SPIE. No.6706. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 67060B. ISBN 9780819468543.

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We report our progress on the development of pixellated imaging CZT detector arrays for our first-generation balloon-borne wide-field hard X-ray (20 - 600 keV) telescope, ProtoEXIST1. Our ProtoEXIST program is a pathfinder for the High Energy Telescope (HET) on the Energetic X-ray Imaging Survey telescope (EXIST), a proposed implementation of the Black Hole Finder Probe. ProtoEXIST1 consists of four independent coded-aperture telescopes with close-tiled (~0.4 mm gaps) CZT detectors that preserve their 2.5mm pixel pitch. Multiple shielding/field-of-view configurations are planned to identify optimal geometry for the HET in EXIST. The primary technical challenge in ProtoEXIST is the development of large area, close-tiled modules of imaging CZT detectors (1000 cm2 for ProtoEXIST1), with all readout and control systems for the ASIC readout vertically stacked. We describe the overall telescope configuration of ProtoEXIST1 and review the current development status of the CZT detectors, from individual detector crystal units (DCUs) to a full detector module (DM). We have built the first units of each component for the detector plane and have completed a few Rev2 DCUs (2x2 cm^2), which are under a series of tests. Bare DCUs (pre-crystal bonding) show high, uniform ASIC yield (~70%) and ~30% reduction in electronics noise compared to the Rev1 equivalent. A Rev1 DCU already achieved ~1.2% FWHM at 662 keV, and preliminary analysis of the initial radiation tests on a Rev2 DCU shows ~ 4 keV FWHM at 60 keV (vs. 4.7 keV for Rev1). We therefore expect about ≤1% FWHM at 662 keV with the Rev2 detectors.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Grindlay, J. E.0000-0002-1323-5314
Howell, J.0000-0002-5924-0629
Harrison, F. A.0000-0003-2992-8024
Additional Information:© 2007 SPIE. This work is supported in part by NASA grants NAG5-5279, NAG5-5396 and NNG06WC12G. We dedicate this work to the late A. Capote at Aguila Technologies for his pioneering efforts and contributions to the project.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:pixellated CZT detectors, hard X-ray telescope, coded aperture imaging
Series Name:Proceedings of SPIE
Issue or Number:6706
Record Number:CaltechAUTHORS:20180109-104132388
Persistent URL:
Official Citation:J. Hong, J. E. Grindlay, N. Chammas, B. Allen, A. Copete, B. Said, M. Burke, J. Howell, T. Gauron, R. G. Baker, S. D. Barthelmy, S. Sheikh, N. Gehrels, W. R. Cook, J. A. Burnham, F. A. Harrison, J. Collins, S. Labov, A. Garson, H. Krawczynski, "Wide-field hard x-ray survey telescope: ProtoEXIST1", Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 67060B (21 September 2007); doi: 10.1117/12.736110;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84189
Deposited By: Tony Diaz
Deposited On:09 Jan 2018 18:57
Last Modified:15 Nov 2021 20:17

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