Monochromator harmonic content measurements and calculations at energies above 20 keV

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Measurements of the harmonic content from single and double crystal silicon monochromators have been made in the 20 to 100 keV at the X17 Superconducting Wiggler Beamline at the NSLS. These measurements are compared with calculations which estimate the monochromatic beam harmonic content and the detection system efficiency with good agreement. At high photon energies ( > 20keV), the scattering of x-rays from an amorphous scatterer is dominated by the inelastic Compton process. At large scattering angles this will completely overwhelm the more forward directed elastic scattering. The Compton x-ray energy shift is large enough to make the distinction between ... continued below

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Chapman, D.; Moulin, H. & Garrett, R.F. January 1, 1991.

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Measurements of the harmonic content from single and double crystal silicon monochromators have been made in the 20 to 100 keV at the X17 Superconducting Wiggler Beamline at the NSLS. These measurements are compared with calculations which estimate the monochromatic beam harmonic content and the detection system efficiency with good agreement. At high photon energies ( > 20keV), the scattering of x-rays from an amorphous scatterer is dominated by the inelastic Compton process. At large scattering angles this will completely overwhelm the more forward directed elastic scattering. The Compton x-ray energy shift is large enough to make the distinction between elastic and Compton scattering unambiguous when a spectrum is acquired with a solid state detector. This shift, which is energy dependent, allows the measurement of the relative harmonic intensity in a way that is not affected by pulse pileup in the detector and electronics. The present measurements were done to assess the level of harmonic contamination from two monochromator systems both used on the X17 beamline: the single crystal type monochromator for the Digital Subtraction Coronary Angiography project; and the double crystal monochromator being developed for the Multiple Energy Computed Tomography (MECT) project and the Materials Science program. 5 refs.

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Pages: (10 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 4. international conference on synchrotron radiation instrumentation, Chester (United Kingdom), 15-19 Jul 1991

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  • Other: DE92002069
  • Report No.: BNL-46647
  • Report No.: CONF-910730--19
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5120613
  • Archival Resource Key: ark:/67531/metadc1053220

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 5, 2018, 1:30 p.m.

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Chapman, D.; Moulin, H. & Garrett, R.F. Monochromator harmonic content measurements and calculations at energies above 20 keV, article, January 1, 1991; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1053220/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.