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

Conference · Wed Jul 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/90667· OSTI ID:7278025

Macrander, A T; Haeffner, D R; Cowan, P L

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}0 and energies of 5 key and 13.84 key. The diffraction characteristics resemble closely diffraction from-asymmetric (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}l%), 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 (+,{minus}) arrangement.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7278025
• Report Number(s): ANL/CP-76870; CONF-920792--26; ON: DE92019671
• Country of Publication: United States
• Language: English

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47 OTHER INSTRUMENTATION
ACCELERATORS
ADVANCED PHOTON SOURCE
COHERENT SCATTERING
CRYSTALS
CYCLIC ACCELERATORS
DIFFRACTION
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
MAGNETS
MONOCHROMATORS
RADIATION SOURCES
SCATTERING
SEMIMETALS
SILICON
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
WIGGLER MAGNETS