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Proceedings Paper

CLAIRE gamma-ray lens: flight and long-distance test results
Author(s): Hubert Halloin; Peter von Ballmoos; Jean Evrard; Gerald K. Skinner; Margarida Hernanz; Nikolai V. Abrosimov; Pierre Bastie; Bernard Hamelin; V. Lonjou; Jose Manuel Alvarez; A. Laurens; Pierre Jean; Juergen Knoedleseder; Robert K. Smither; Gilbert Vedrenne
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Paper Abstract

CLAIRE is a balloon-borne experiment dedicated to validating the concept of a diffraction gamma-ray lens. This new concept for high energy telescopes is very promising and could significantly increase sensitivity and angular resolution in nuclear astrophysics. CLAIRE's lens consists of 556 Ge-Si crystals, focusing 170 keV gamma-ray photons onto a 3x3 matrix of HPGe detectors, each detector element being only 1.4x1.4x4 cm3. On June 14 2001, CLAIRE was launched by the French Space Agency (CNES)from its balloon base at Gap in the French Alps and was recovered near the Atlantic ocean (500 km to the west) after about 5 hours at float altitude. Pointing accuracy and gondola stabilization allowed us to select 1h12' of "good time intervals" for the data analysis. During this time, 33 diffracted photons have been detected leading to a 3σ detection of the source. Additional measurements made on a ground based 205 meters long test range are also presented. The results of this latter experiment confirm those of the stratospheric flight.

Paper Details

Date Published: 29 January 2004
PDF: 11 pages
Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004); doi: 10.1117/12.508307
Show Author Affiliations
Hubert Halloin, Ctr. d'Etude Spatiale des Rayonnements (France)
Peter von Ballmoos, Ctr. d'Etude Spatiale des Rayonnements (France)
Jean Evrard, Ctr. National d'Etudes Spatiales (France)
Gerald K. Skinner, Ctr. d'Etude Spatiale des Rayonnements (France)
Margarida Hernanz, Institut d'Estudis Espacials de Catalunya (Spain)
Nikolai V. Abrosimov, Institut für Kristallzuehtung (Germany)
Pierre Bastie, Univ. Joseph Fourier-Grenoble I (France)
Bernard Hamelin, Institut Laue-Langevin (France)
V. Lonjou, Ctr. d'Etude Spatiale des Rayonnements (France)
Jose Manuel Alvarez, Institut d'Estudis Espacials de Catalunya (Spain)
A. Laurens, Ctr. National d'Etudes Spatiales (France)
Pierre Jean, Ctr. d'Etude Spatiale des Rayonnements (France)
Juergen Knoedleseder, Ctr. d'Etude Spatiale des Rayonnements (France)
Robert K. Smither, Argonne National Lab. (United States)
Gilbert Vedrenne, Ctr. d'Etude Spatiale des Rayonnements (France)


Published in SPIE Proceedings Vol. 5168:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy
Oberto Citterio; Stephen L. O'Dell, Editor(s)

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