The basic component of the ISGRI CdTe /γ-ray camera for space telescope IBIS on board the INTEGRAL satellite

Details The basic component of the ISGRI CdTe /γ-ray camera for space telescope IBIS on board the INTEGRAL satellite The basic component of the ISGRI CdTe /γ-ray camera for space telescope IBIS on board the INTEGRAL satellite

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.428..216l&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 428, Issue 1, p. 216-222.

Physics

5

Scientific paper

The /γ-ray imager telescope IBIS, on board the INTEGRAL satellite, features a coded mask aperture and two detector arrays. The first detector array (ISGRI) is an assembly of 16384 CdTe detectors (/4×4 mm2 large, 2 mm thick) operating at room temperature under 100 V bias. ISGRI covers the lower part (20 keV-1 MeV) of the IBIS energy range (20 keV-10 MeV). The polycell is the basic component of the ISGRI detector array. It is made of 16 CdTe pixels and their front-end electronics. In order to improve the response of the instrument, a charge loss correction based on the charge-drift time is necessary. Therefore, the front-end electronics performs the rise-time measurement in addition to the standard pulse-height measure. On the other hand, the necessarily tight packaging and the limited available power requires the use of ASICs. These 4-channel analog-digital ASICs should be radiation resistant either through the use of a latch up free technology or by applying an appropriate layout design. The optimal operating temperature (around /0°C) is ensured under vacuum conditions by radiative cooling. This paper describes the ISGRI design with particular emphasis on the ASICs and polycells, and reports preliminary performance measurements.

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