http://www.cnr.it/ontology/cnr/individuo/prodotto/ID32769

Mosaic GaAs crystals for hard x-ray astronomy (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Mosaic GaAs crystals for hard x-ray astronomy (Articolo in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1117/12.796682 (literal)

Alternative label

Ferrari C.; Zanotti L.; Zappettini A.; Arumainathan S. (2008)
Mosaic GaAs crystals for hard x-ray astronomy
in Proceedings of SPIE, the International Society for Optical Engineering; SPIE-INT SOC OPTICAL ENGINEERING, BELLINGHAM, WA 98227-0010 (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Ferrari C.; Zanotti L.; Zappettini A.; Arumainathan S. (literal)

Pagina inizio

70770O (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

3rd Conference on Advances in X-Ray/EUV Optics and Components Location, San Diego, CA, AUG 11-13, 2008 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1327279 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

7077 (literal)

Rivista

Proceedings of SPIE, the International Society for Optical Engineering (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

In: Proceedings of the Society of Photo-Optical Instrumentation Engineers, vol. 7077 article n. 70770O. Ali M. Khounsary, Christian Morawe, Shunji Goto, Eds (eds.). SPIE, 2008. (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

11 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

CNR-IMEM, Parma, Department of Nuclear Physics , Guindy Campus, Chennai - India (literal)

Titolo

Mosaic GaAs crystals for hard x-ray astronomy (literal)

Abstract

Recently the design of a Laue lens with field of view of 30 arcseconds and for x-rays in the energy range from 100 keV to 1 MeV has been proposed in which mosaic crystals are used as focussing elements. The proper mosaic angular spread is chosen as a compromise between intensity and energy resolution of the Laue lens. In the present work we consider the use of GaAs crystals as optical elements for hard x-ray astronomy. GaAs crystals have essentially the same electron density and lattice spacing as germanium, and are characterized by spontaneous formation of \"cellular structures\" with dislocations distribution at the boundaries between perfect zones of the crystal. Because of the presence of cellular structures Czochralsky grown GaAs show a natural degree of mosaicity. Several GaAs ingots grown by liquid encapsulating Czochralsky technique have been characterized by high resolution x-ray diffraction. Bragg diffraction profiles have been measured along ingot axes and diameters of doped, undoped or stoichiometry deviated GaAs crystals. Full width at half maximum values ranging from 15 to 40 arcseconds depending on the position were measured close to the proposed 30 arcsecond mosaicity required for the Laue lens. Appropriate growth conditions allow the control of the dislocation density and the modification of cellular structure responsible of the crystal mosaicity so that the possibility of obtaining crystals with a given degree of mosaicity by tuning the LEC growth conditions is proposed. (literal)

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