Mr. Domink S. Gorni Profile

Domink S. Gorni

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Proceedings Article | 21 August 2024 Poster + Paper

Test and characterization of finely segmented pixel CZT detectors for future hard x-ray missions

G. Pinaroli, G. Carini, G. Deptuch, D. Gorni, P. Maj, H. Krawczynski

Proceedings Volume 13093, 130935R (2024) https://doi.org/10.1117/12.3019976

KEYWORDS: Sensors, Hard x-rays, X-rays, Spatial resolution, Spectroscopy, X-ray telescopes, Iron, Stars, Signal processing, Mirrors

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The NuSTAR (Nuclear Spectroscopic Telescope Array) mission was launched in 2012, and it has successfully deployed the first orbiting telescopes to focus high energy X-ray (3 - 79 keV) light, providing a wealth of new information on high-energy X-rays sources. Follow-up missions, such as the proposed HEX-P, BEST, and FORCE, could perform a deeper black hole census providing a more refined measurement of black hole spins, allowing for greater knowledge about supermassive black holes. These missions are motivated by the recent breakthroughs in the hard X-ray mirror technologies, where mirrors, either made of monolithic silicon segments, or made directly or via replication of shells, demonstrate the feasibility of making hard X-ray mirrors with angular resolutions of 5-10 arc-seconds Half Power Diameter (HPD) compared to the NuSTAR’s 1 arc-minute HPD. Such a high angular resolution requires matched detectors with higher degree of segmentation to fully benefit from the achievable improved spatial resolution. In the above framework, the HEXID ASIC, a novel pixelated front-end suitable for reading out a finely segmented CZT sensor with 150 μm pixel pitch in a hexagonal arrangement has been developed. This readout pixelated chip is capable of processing photon-generated charge packets over a large dynamic range (from 2 keV up to 180 keV), while keeping a low input noise (ENC <20 e^-). In this work, the initial characterization of the ASIC prototype will be presented.

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