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Proceedings Paper

Development of a pixelated CdTe detector module for a hard-x and gamma-ray imaging spectrometer application
Author(s): J.-L. Galvèz; M. Hernanz; L. Álvarez; B. Artigues; J.-M. Álvarez; M. Ullán; M. Lozano; G. Pellegrini; E. Cabruja; R. Martínez; M. Chmeissani; C. Puigdengoles
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Paper Abstract

Stellar explosions are relevant and interesting astrophysical phenomena. Since long ago we have been working on the characterization of novae and supernovae in X and gamma-rays, with the use of space missions. We have also been involved in feasibility studies of future instruments in the energy range from several keV up to a few MeV, in collaboration with other research institutes. High sensitivities are essential to perform detailed studies of cosmic explosions and cosmic accelerators, e.g., Supernovae and Classical Novae. In order to fulfil the combined requirement of high detection efficiency with good spatial and energy resolution, an initial module prototype based on CdTe pixel detectors is being developed. The detector dimensions are 12.5mm x 12.5mm x 2mm with a pixel pitch of 1mm x 1mm. Two kinds of CdTe pixel detectors with different contacts have been tested: ohmic and Schottky. Each pixel is bump bonded to a fanout board made of Sapphire substrate and routed to the corresponding input channel of the readout VATAGP7.1 ASIC, to measure pixel position and pulse height for each incident gamma-ray photon. The study is complemented by the simulation of the CdTe module performance using the GEANT 4 and MEGALIB tools, which will help us to optimise the detector design. We will report on the spectroscopy characterisation of the CdTe detector module as well as the study of charge sharing.

Paper Details

Date Published: 11 July 2016
PDF: 13 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99054B (11 July 2016); doi: 10.1117/12.2231720
Show Author Affiliations
J.-L. Galvèz, Institut de Ciències de l'Espai (Spain)
M. Hernanz, Institut de Ciències de l'Espai (Spain)
L. Álvarez, Institut de Ciències de l'Espai (Spain)
B. Artigues, Institut de Ciències de l'Espai (Spain)
J.-M. Álvarez, Ctr. de Láseres Pulsados (Spain)
M. Ullán, Ctr. Nacional de Microelectrónica (Spain)
M. Lozano, Ctr. Nacional de Microelectrónica (Spain)
G. Pellegrini, Ctr. Nacional de Microelectrónica (Spain)
E. Cabruja, Ctr. Nacional de Microelectrónica (Spain)
R. Martínez, Ctr. Nacional de Microelectrónica (Spain)
M. Chmeissani, Ctr. Nacional de Microelectrónica (Spain)
C. Puigdengoles, Institut de Física d'Altes Energies (Spain)

Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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