The ISGRI CdTe gamma-ray camera: first steps

Details The ISGRI CdTe gamma-ray camera: first steps The ISGRI CdTe gamma-ray camera: first steps

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nimpa.442..244l&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 442, Issue 1-3, p. 244-249.

Physics

8

Scientific paper

The gamma-ray telescope IBIS, on board the INTEGRAL satellite, features a coded-mask aperture, active and passive shields and two detector arrays. The first one (ISGRI) is an assembly of 16384 CdTe detectors (4×4mm large, 2mm thick) operating at room temperature. ISGRI covers the lower part (15keV-1MeV) of the IBIS energy range (15keV-10MeV). Detectors are arranged on polycells, each including 16 crystals, connected to their front-end electronics (ASICs). Each of the eight independent ISGRI modules are made of 128 polycells. The ASICs contain a low noise charge-sensitive preamplifier and feature pulse rise-time measurement in addition to the standard pulse height measurement. This permits to compute a charge loss correction based on the charge drift time. After application of this correction, a spectral resolution around 7.5% at 122keV is obtained with the ASICs. Today, 16 polycells have been mounted on the first representative ISGRI module. This module has been interfaced with the entire ISGRI data-processing electronics and forms the engineering model of ISGRI. After a presentation of the scientific context, this paper describes the ISGRI design with particular emphasis on the detectors, the polycells performances and the module assembly.

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