Polycell: The elementary detection unit of the ISGRI CdTe γ-ray camera

被引：0
|
作者：
Limousin, O. [1 ]
Arques, M. [2 ]
Crétolle, J. [1 ]
Lebrun, F. [1 ]
Leray, J.P. [1 ]
Baffert, N. [2 ]
Lattard, D. [2 ]
Martin, J.L. [2 ]
Masson, G. [2 ]
Noca, A. [2 ]
Mathy, F. [2 ]
Rostaing, J.P. [2 ]
Trystram, P. [2 ]
Villard, P. [2 ]
Baron, P. [3 ]
Delagnes, E. [3 ]
Rouger, M. [3 ]
机构：
[1] CEA/DSM/DAPNIA/ Serv. d'Astrophys., CEA/Saclay, 91191, Gif-sur-Yvette Cedex, France
[2] CEA/DTA/LETI/Serv. Capteurs S., CEA/Grenoble, 38054, Grenoble Cedex, France
[3] CEA/DSM/DAPNIA/Serv. d'E., CEA/Saclay, 91191, Gif-sur-Yvette Cedex, France
来源：
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2001年 / 458卷 / 1-2期
关键词：
Cameras - Gamma rays - Optical telescopes - Satellites - Semiconducting cadmium telluride;
D O I：
10.1016/s0168-9002(00)00921-9
中图分类号：
学科分类号：
摘要：
A basic component called Polycell has been developed for the ISGRI CdTe γ-ray camera of the IBIS telescope on board the INTEGRAL satellite. This imager is an assembly of 16384 CdTe detectors (4×4 mm large, 2 mm thick) operating at room temperature. ISGRI covers the lower part (20 keV-1 MeV) of the IBIS energy range (20 keV-10 MeV). Detectors are arranged 4×4 on Polycells, where they are connected to their front-end electronics. The front-end electronics is based on radiation tolerant 4-channel analog-digital ASICs. The ASICs contain a low-noise charge-sensitive preamplifier (160e- rms; 1 pF load) and a 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. The digital part includes the internal acquisition timing sequence as well as the dialogue with external electronics. After a description of the front-end electronics, we will present the improvements made on the new and final version of this hybrid mini CdTe γ-ray cameras. In conclusion, we will present the spectrometric performance obtained owing to this modular device. A spectral resolution around 7% at 122 keV is obtained with this last generation of ASICs.
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页码：551 / 557
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