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Proceedings Paper

Research and development of a gamma-ray imaging spectrometer in the MeV range in Barcelona
Author(s): José-Manuel Alvarez; José-Luis Galvez; Margarita Hernanz; Jordi Isern; Manuel Lozano; Giulio Pellegrini; Mokhtar Chmeissani; Enric Cabruja; Miguel Ullán
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Paper Abstract

Gamma-ray astrophysics in the MeV energy range plays an important role for the understanding of cosmic explosions and acceleration mechanisms in a variety of galactic and extragalactic sources, e.g., Supernovae, Classical Novae, Supernova Remnants (SNRs), Gamma-Ray Bursts (GRBs), Pulsars, Active Galactic Nuclei (AGN). Through the development of focusing telescopes in the MeV energy range, it will be possible to reach unprecedented sensitivities, compared with those of the currently operating gamma ray telescopes. In order to achieve the needed performance, a detector with mm spatial resolution and very high peak efficiency is required. It will be also desirable that the detector could detect polarization of the source. Our research and development activities in Barcelona aim to study a gamma-ray imaging spectrometer in the MeV range suited for the focal plane of a gamma-ray telescope mission, based on CdTe pixel detectors arranged in multiple layers with increasing thicknesses, to enhance gamma-ray absorption in the Compton regime. We have developed an initial prototype based on several CdTe module detectors, with 11x11 pixels, a pixel pitch of 1mm and a thickness of 2mm. Each pixel is stud-bump bonded to a fanout board and routed to a readout ASIC to measure pixel position, pulse height and rise time information for each incident gamma-ray photon. We will report on the results of an optimization study based on simulations, to select the optimal thickness of each CdTe detector within the module to get the best energy resolution of the spectrometer.

Paper Details

Date Published: 29 July 2010
PDF: 11 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77324P (29 July 2010); doi: 10.1117/12.857500
Show Author Affiliations
José-Manuel Alvarez, Consejo Superior de Investigaciones Científicas (Spain)
José-Luis Galvez, Consejo Superior de Investigaciones Científicas (Spain)
Margarita Hernanz, Consejo Superior de Investigaciones Científicas (Spain)
Jordi Isern, Consejo Superior de Investigaciones Científicas (Spain)
Manuel Lozano, Ctr. Nacional de Microelectrónica (Spain)
Giulio Pellegrini, Ctr. Nacional de Microelectrónica (Spain)
Mokhtar Chmeissani, Institut de Física d'Altes Energies (Spain)
Enric Cabruja, Ctr. Nacional de Microelectrónica (Spain)
Miguel Ullán, Ctr. Nacional de Microelectrónica (Spain)

Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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