Development of a 32-detector CdTe matrix for the SVOM ECLAIRs x/gamma camera: tests results of first flight models

K. Lacombe; J.-P. Dezalay; B. Houret; C. Amoros; J.-L. Atteia; K. Aubaret; M. Billot; S. Bordon; B. Cordier; S. Delaigue; M. Galliano; O. Gevin; O. Godet; F. Gonzalez; Ph. Guillemot; O. Limousin; K. Mercier; G. Nasser; R. Pons; D. Rambaud; P. Ramon; V. Waegebaert

doi:10.1117/12.2233558

18 July 2016 Development of a 32-detector CdTe matrix for the SVOM ECLAIRs x/gamma camera: tests results of first flight models

K. Lacombe, J.-P. Dezalay, B. Houret, C. Amoros, J.-L. Atteia, K. Aubaret, M. Billot, S. Bordon, B. Cordier, S. Delaigue, M. Galliano, O. Gevin, O. Godet, F. Gonzalez, Ph. Guillemot, O. Limousin, K. Mercier, G. Nasser, R. Pons, D. Rambaud, P. Ramon, V. Waegebaert

Author Affiliations +

Proceedings Volume 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray; 99050J (2016) https://doi.org/10.1117/12.2233558
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

ECLAIRs, a 2-D coded-mask imaging camera on-board the Sino-French SVOM space mission, will detect and locate gamma-ray bursts in near real time in the 4 - 150 keV energy band in a large field of view. The design of ECLAIRs has been driven by the objective to reach an unprecedented low-energy threshold of 4 keV. The detection plane is an assembly of 6400 Schottky CdTe detectors of size 4x4x1 mm³, biased from -200V to -500V and operated at -20°C. The low-energy threshold is achieved thanks to an innovative hybrid module composed of a thick film ceramic holding 32 CdTe detectors ("Detectors Ceramics"), associated to an HTCC ceramic housing a low-noise 32-channel ASIC ("ASIC Ceramics"). We manage the coupling between Detectors Ceramics and ASIC Ceramics in order to achieve the best performance and ensure the uniformity of the detection plane.

In this paper, we describe the complete hybrid XRDPIX, of which 50 flight models have been manufactured by the SAGEM company. Afterwards, we show test results obtained on Detectors Ceramics, on ASIC Ceramics and on the modules once assembled. Then, we compare and confront detectors leakage currents and ASIC ENC with the energy threshold values and FWHM measured on XRDPIX modules at the temperature of -20°C by using a calibrated radioactive source of 241Am. Finally, we study the homogeneity of the spectral properties of the 32-detector hybrid matrices and we conclude on general performance of more than 1000 detection channels which may reach the lowenergy threshold of 4 keV required for the future ECLAIRs space camera.

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K. Lacombe, J.-P. Dezalay, B. Houret, C. Amoros, J.-L. Atteia, K. Aubaret, M. Billot, S. Bordon, B. Cordier, S. Delaigue, M. Galliano, O. Gevin, O. Godet, F. Gonzalez, Ph. Guillemot, O. Limousin, K. Mercier, G. Nasser, R. Pons, D. Rambaud, P. Ramon, and V. Waegebaert "Development of a 32-detector CdTe matrix for the SVOM ECLAIRs x/gamma camera: tests results of first flight models", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99050J (18 July 2016); https://doi.org/10.1117/12.2233558

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