1 September 2010 Design of a coded aperture Compton telescope imaging system (CACTIS)
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Abstract
We have developed a prototype of a scalable high-resolution direction and energy sensitive gamma-ray detection system that operates in both coded aperture (CA) and Compton scatter (CS) modes to obtain optimal efficiency and angular resolution over a wide energy range. The design consists of an active coded aperture constructed from 52 individual CZT planar detectors each measuring 3×3×6 mm3 arranged in a MURA pattern on a 10×10 grid, with a monolithic 20×20×5 mm3 pixelated (8×8) CZT array serving as the focal plane. The combined mode is achieved by using the aperture plane array for both Compton scattering of high-energy photons and as a coded mask for low-energy radiation. The prototype instrument was built using two RENA-3 test systems, one each for the aperture and the focal plane, stacked on top of each other at a distance of 130 mm. The test systems were modified to coordinate (synchronize) readout and provide coincidence information of events within a user-adjustable 40-1,280 ns window. The measured angular resolution of the device is <1 deg (17 mrad) in CA mode and is predicted to be approximately 3 deg (54 mrad) in CS mode. The energy resolution of the CZT detectors is approximately 5% FWHM at 120 keV. We will present details of the system design and initial results for the calibration and performance of the prototype.
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Alexander Volkovskii, Alexander Volkovskii, Martin Clajus, Martin Clajus, Stephen R. Gottesman, Stephen R. Gottesman, Hans Malik, Hans Malik, Kenneth Schwartz, Kenneth Schwartz, Evren Tumer, Evren Tumer, Tumay Tumer, Tumay Tumer, Shi Yin, Shi Yin, "Design of a coded aperture Compton telescope imaging system (CACTIS)", Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 78051V (1 September 2010); doi: 10.1117/12.862995; https://doi.org/10.1117/12.862995
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