Translator Disclaimer
Paper
21 September 2007 R and D progress on second-generation crystals for Laue lens applications
Author Affiliations +
Abstract
The concept of a gamma-ray telescope based on a Laue lens offers the possibility to increase the sensitivity by more than an order of magnitude with respect to existing instruments. Laue lenses have been developed by our collaboration for several years : the main achievement of this R&D program was the CLAIRE lens prototype, which has successfully demonstrated the feasibility of the concept in astrophysical conditions. Since then, the endeavour has been oriented towards the development of efficient diffracting elements (crystal slabs) in order to increase both the effective area and the width of the energy bandpass focused, the aim being to step from a technological Laue lens to a scientifically exploitable lens. The latest mission concept featuring a gamma-ray lens is the European Gamma- Ray Imager (GRI) which intends to make use of the Laue lens to cover energies from 200 keV to 1300 keV. Investigations of two promising materials, low mosaicity copper and gradient concentration silicongermanium are presented in this paper. The measurements have been performed during three runs: 6 + 4 days at the European Synchrotron Radiation Facility (Grenoble, France), on beamline ID15A, using a 500 keV monochromatic beam, and 14 days on the GAMS 4 instrument of the Institute Laue Langevin (Grenoble, France) featuring a highly monochromatic beam of 517 keV. Despite it was not perfectly homogeneous, the presented copper crystal has exhibited peak reflectivity of 25 % in accordance with theoretical predictions, and a mosaicity around 26 arcsec, the ideal range for the realization of a Laue lens such as GRI. Silicon-germanium featuring a constant gradient have been measured for the very first time at 500 keV. Two samples showed a quite homogeneous reflectivity reaching 26%, which is far from the 48 % already observed in experimental crystals but a very encouraging beginning. The measured results have been used to estimate the performance of the GRI Laue lens design.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Barrière, P. von Ballmoos, P. Bastie, P. Courtois, N. V. Abrosimov, K. Andersen, T. Buslaps, T. Camus, H. Halloin, M. Jentschel, J. Knödlseder, G. Roudil, D. Serre, and G. Skinner "R and D progress on second-generation crystals for Laue lens applications", Proc. SPIE 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III, 66880O (21 September 2007); https://doi.org/10.1117/12.733993
PROCEEDINGS
11 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Self standing curved crystals for gamma ray focusing
Proceedings of SPIE (May 12 2015)
LAUE lens development at UC Berkeley: status and prospects
Proceedings of SPIE (September 26 2013)
Gamma ray focusing telescope based on high reflective Ge and...
Proceedings of SPIE (September 10 2005)
Quasi-mosaicity as a tool for focusing hard x-rays
Proceedings of SPIE (September 17 2012)
Soft gamma ray optics new Laue lens design and...
Proceedings of SPIE (August 31 2009)
High-Z crystals for gamma-ray optics
Proceedings of SPIE (August 31 2009)
Second generation crystals for Laue lens applications
Proceedings of SPIE (June 27 2006)

Back to Top