HAL : in2p3-00130755, version 1

DOI : 10.1007/s10686-006-9064-z

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Experimental Astronomy 20 (2006) 151-170

Laue diffraction lenses for astrophysics: Theoretical concepts

H. Halloin 1, 2, P. Bastie 3, 4

(2006)

Beyond the present technologies, Laue diffraction lenses are very promising tools in the field of gamma-ray astrophysics. The theoretical concepts of this kind of instruments are based on the Laue diffraction in crystals, discovered almost 100 years ago. Though they are commonly used in crystallography, their application to γ-ray focusing in astrophysics requires some specific developments, e.g. in terms of energy and imaging responses. The present article describes the physics of X-ray diffraction in crystals. In the context of the Darwin model of mosaic crystals, some peculiar aspects, relevant to the astrophysical observation, are discussed. The evaluation and optimization of diffraction efficiency are discussed, especially with rigards to the crystal's mosaicity and thickness, its spatial extent and deviations to the “ideally imperfect” Darwin model.

1 :	AstroParticule et Cosmologie (APC)
	CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
2 :	Centre d'étude spatiale des rayonnements (CESR)
	CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
3 :	Laboratoire de Spectrométrie Physique (LSP)
	CNRS : UMR5588 – Université Joseph Fourier - Grenoble I
4 :	Institut Laue-Langevin (ILL)
	ILL

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Physique/Physique des Hautes Energies - Expérience Physique/Physique/Instrumentations et Détecteurs Planète et Univers/Astrophysique

Mot(s)-clé(s) : Focusing optics – Gamma-ray astrophysics – Crystal diffraction

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Contributeur : Simone Lantz <>

Soumis le : Mardi 13 Février 2007, 16:20:15

Dernière modification le : Lundi 26 Mars 2007, 15:11:43