CZT detectors for a new generation of &#947;-ray telescopes

Egidio M. Quadrini; Giancarlo Conti; Sergio D'Angelo; Mauro Fiorini; Michela Uslenghi; Lorenzo Natalucci; Pietro Ubertini

doi:10.1117/12.616686

18 August 2005 CZT detectors for a new generation of γ-ray telescopes

Egidio M. Quadrini, Giancarlo Conti, Sergio D'Angelo, Mauro Fiorini, Michela Uslenghi, Lorenzo Natalucci, Pietro Ubertini

Author Affiliations +

Proceedings Volume 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV; 58980O (2005) https://doi.org/10.1117/12.616686
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The outstanding scientific performances of IBIS, Imager on Board INTEGRAL, has encouraged preliminary feasibility studies on new Gamma Ray instruments. We considered both a Wide Field Camera for transient event detection and fast automatic sky localisation and a high resolution imager. According to the basic scientific requirements, i.e. to operate with good sensitivity (1mCrab/day) and spatial resolution (from arcmin to arcsec) on a wide energy range (5 to 500 keV), these studies consider large detector area (from 1 to several m²) and a high number (~50000) of thick (≥ 5mm) pixels. Recent achievements already obtained by INTEGRAL, and initially showed by SWIFT, have validated the CdTe/CZT detector performances in terms of good spatial resolution, detection efficiency, energy resolution and low noise at room temperature. We have started a study to solve peculiar problems affecting this kind of detectors (e.g. response dependent on the interaction depth and multiple hit events) using a digital approach to photon reconstruction. This also facilitates operations like pixel to pixel equalisation and background rejection. The detector electronic chain thus includes a minimal analog stage for charge pre-amplification, coupled to a flash ADC for waveform digitalisation at a high time resolution sampling, and a powerful, FPGA based digital processing unit, devoted to waveform elaboration. Such a design should also help in optimising the telemetry flux and allow polarimetry evaluation on multiple events.

Citation Download Citation

Egidio M. Quadrini, Giancarlo Conti, Sergio D'Angelo, Mauro Fiorini, Michela Uslenghi, Lorenzo Natalucci, and Pietro Ubertini "CZT detectors for a new generation of γ-ray telescopes", Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980O (18 August 2005); https://doi.org/10.1117/12.616686

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