Flux-enhanced monochromator by ultrasound excitation of annealed Czochralski-grown silicon crystals

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Details zur Publikation

Autor(en): Hock R
Zeitschrift: Applied Physics A-Materials Science & Processing
Jahr der Veröffentlichung: 2003
Band: 76
Heftnummer: 6
Seitenbereich: 935-938
ISSN: 0947-8396


The neutron flux from monochromator crystals can be increased by ultrasound excitation or by strain fields. Rocking curves of both a perfect float-zone silicon crystal and an annealed Czochralski silicon crystal with oxygen precipitates were measured at various levels of ultrasound excitation on a cold-neutron backscattering spectrometer. We find that the effects of the dynamic strain field from the ultrasound and the static strain field from the defects are not additive. Rocking curves were also taken at different ultrasound frequencies near resonance of the crystal/ultrasound-transducer system with a time resolution of 1 min. Pronounced effects of crystal heating are observed, which render the conditions for maximum neutron reflectivity delicate.

FAU-Autoren / FAU-Herausgeber

Hock, Rainer Prof. Dr.
Professur für Kristallographie und Strukturphysik

Zuletzt aktualisiert 2018-10-08 um 16:08