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Applied Physics A

, Volume 76, Issue 6, pp 935–938 | Cite as

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

  • S. Köhler
  • R. Hock
  • C. Seitz
  • A. Magerl
  • E. Mashkina
  • A. Demin
  • 46 Downloads

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.

PACS: 07.85.Jy; 61.72.Dd 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • S. Köhler
    • 1
  • R. Hock
    • 1
  • C. Seitz
    • 1
  • A. Magerl
    • 1
  • E. Mashkina
    • 2
  • A. Demin
    • 2
  1. 1.University of Erlangen-Nuremberg, Lehrstuhl für Kristallographie und Strukturphysik, Bismarckstr. 10, 91056 Erlangen, GermanyDE
  2. 2.Institute of High Temperature Electrochemistry, 20 S. Kovalevsky St., 620219 Ekaterinburg, RussiaRU

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