Emittance, brilliance, and bandpass issues related to an inclined crystal monochromator

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Description

The inclined double crystal monochromator arrangement is very effective in handling high heat loads and holds considerable promise as a monochromator for undulator beams at third generation synchrotrons. Results for the ideal inclined crystal case have been obtained by dynamical diffraction calculations, and diffraction results for the (111) reflection of silicon are presented for an inclination angle of 85{degrees} and energies of 5 keV and 13.84 keV. The diffraction characteristics resemble closely diffraction from a symmetric (111) plane of silicon. However, the inclined and noninclined cases are not identical. Diffraction in the inclined case is slightly different due to refraction. ... continued below

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9 p.

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Macrander, A.T.; Haeffner, D.R. & Cowan, P.L. July 31, 1992.

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Description

The inclined double crystal monochromator arrangement is very effective in handling high heat loads and holds considerable promise as a monochromator for undulator beams at third generation synchrotrons. Results for the ideal inclined crystal case have been obtained by dynamical diffraction calculations, and diffraction results for the (111) reflection of silicon are presented for an inclination angle of 85{degrees} and energies of 5 keV and 13.84 keV. The diffraction characteristics resemble closely diffraction from a symmetric (111) plane of silicon. However, the inclined and noninclined cases are not identical. Diffraction in the inclined case is slightly different due to refraction. The full width at half maximum of the Darwin-Prins reflectivity curve is slightly increased ({approximately} 1%), and the angles of the outgoing beam after one reflection are slightly altered. That is, except for a wave incident at the Laue point in reciprocal space, the diffraction is always slightly asymmetric. The effect can be exactly reversed by an identical second crystal in the (+,-) arrangement.

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9 p.

Notes

OSTI as DE95015567

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  • Other Information: PBD: 31 Jul 1992

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  • Other: DE95015567
  • Report No.: LS--206
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/90667 | External Link
  • Office of Scientific & Technical Information Report Number: 90667
  • Archival Resource Key: ark:/67531/metadc793237

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  • July 31, 1992

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2016, 2:48 p.m.

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Macrander, A.T.; Haeffner, D.R. & Cowan, P.L. Emittance, brilliance, and bandpass issues related to an inclined crystal monochromator, report, July 31, 1992; Illinois. (digital.library.unt.edu/ark:/67531/metadc793237/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.