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.

引用

页码：551 / 557