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Proceedings Paper

CZT detectors for a new generation of γ-ray telescopes
Author(s): Egidio M. Quadrini; Giancarlo Conti; Sergio D'Angelo; Mauro Fiorini; Michela Uslenghi; Lorenzo Natalucci; Pietro Ubertini
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Paper 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.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980O (18 August 2005); doi: 10.1117/12.616686
Show Author Affiliations
Egidio M. Quadrini, INAF-IASF Milano (Italy)
Giancarlo Conti, INAF-IASF Milano (Italy)
Sergio D'Angelo, INAF-IASF Milano (Italy)
Mauro Fiorini, INAF-IASF Milano (Italy)
Michela Uslenghi, INAF-IASF Milano (Italy)
Lorenzo Natalucci, INAF-IASF Roma (Italy)
Pietro Ubertini, INAF-IASF Roma (Italy)

Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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