Building Large Area CZT Imaging Detectors for a Wide-Field Hard X-ray Telescope - ProtoEXIST1
J. Hong, B. Allen, J. Grindlay, N. Chammas, S. Barthelemy, R. Baker,, N. Gehrels, K. E. Nelson, S. Labov, J. Collins, W. R. Cook, R. McLean, and F., Harrison

TL;DR
This paper reports the development of a large-area, fine-pixel CZT detector array for a wide-field hard X-ray telescope prototype, demonstrating high energy resolution and modular design for future space applications.
Contribution
It introduces a modular tiling approach for constructing large, continuous CZT detector planes with high energy resolution for space-based X-ray telescopes.
Findings
Achieved 3.2 keV energy resolution at 59.6 keV
Constructed a 32 cm2 detector with fine 2.5 mm pixels
Demonstrated modular tiling for large-area detector planes
Abstract
We have constructed a moderately large area (32 cm2), fine pixel (2.5 mm pixel, 5 mm thick) CZT imaging detector which constitutes the first section of a detector module (256 cm2) developed for a balloon-borne wide-field hard X-ray telescope, ProtoEXIST1. ProtoEXIST1 is a prototype for the High Energy Telescope (HET) in the Energetic X-ray imaging Survey Telescope (EXIST), a next generation space-borne multi-wavelength telescope. We have constructed a large (nearly gapless) detector plane through a modularization scheme by tiling of a large number of 2 cm x 2 cm CZT crystals. Our innovative packaging method is ideal for many applications such as coded-aperture imaging, where a large, continuous detector plane is desirable for the optimal performance. Currently we have been able to achieve an energy resolution of 3.2 keV (FWHM) at 59.6 keV on average, which is exceptional considering the…
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