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

S Kohler, Rainer Hock, Christoph Seitz, Andreas Magerl, Elena Mashkina, Anatoly Demin

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)935 - 938
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Volume76
Issue number6
Publication statusPublished - 2003
Externally publishedYes

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