High resolution monochromator for inelastic scattering studies of high energy phonons using undulator radiation at the Advanced Photon Source

Albert T. Macrander, Markus Schwoerer-Böhning, Peter M. Abbamonte, Michael Hu

Research output: Contribution to journalConference articlepeer-review

Abstract

A monochromator for use at 13.84 keV with a calculated bandpass of 5.2 meV was designed, built, and tested. Tuning was performed by rotating the inner crystal of a pair of nested silicon channel cut crystals. The inner crystal employs the (884) reflection, and the outer crystal employs a collimating asymmetric (422) reflection (dynamical asymmetry factor, b, equal to -17.5). Tests were done with a double crystal Si(111) pre-monochromator situated upstream of the high resolution monochromator and a Si(777) backscattering crystal situated downstream. For this optical arrangement an ideal value of 6.3 meV as calculated by x-ray dynamical diffraction theory applies for the FWHM of the convolution of the net monochromator reflectivity function with that of the Si(777) reflection. This calculated value is to be compared to the value of 7.1 meV measured by tuning the high resolution monochromator. Measured efficiencies were less than ideal by a factor of 3.2 to 4.9, where the larger flux reduction factors were found with higher positron storage ring currents.

Original languageEnglish (US)
Pages (from-to)271-281
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3151
DOIs
StatePublished - 1997
Externally publishedYes
EventHigh Heat Flux and Synchrotron Radiation Beamlines - San Diego, CA, United States
Duration: Jul 28 1997Jul 28 1997

Keywords

  • High resolution
  • Inelastic x-ray scattering
  • Synchrotron radiation
  • X-ray monochromator

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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