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

Albert T. Macrander; Dean R. Haeffner; Paul L. Cowan

doi:10.1117/12.142565

20 January 1993 Emittance, brilliance, and bandpass issues related to an inclined crystal monochromator

Albert T. Macrander, Dean R. Haeffner, Paul L. Cowan

Proceedings Volume 1740, Optics for High-Brightness Synchrotron Radiation Beamlines; (1993) https://doi.org/10.1117/12.142565
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

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 degree(s) 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.

Citation Download Citation

Albert T. Macrander, Dean R. Haeffner, and Paul L. Cowan "Emittance, brilliance, and bandpass issues related to an inclined crystal monochromator", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); https://doi.org/10.1117/12.142565

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