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Proceedings Paper

Advanced Photon Source undulator beamline tests of a contact-cooled silicon u-shaped monochromator
Author(s): Wah Keat Lee; Patricia B. Fernandez; Ali M. Khounsary; Wenbing Yun; Emil M. Trakhtenberg
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Paper Abstract

At the Advanced Photon Source (APS), undulator insertion devices are capable of producing x-ray beams with a total power of about 5 kW and normal incidence heat fluxes of about 170 W/mm2 at 30 m from the source. On beamlines in which the first optical element is a mirror, the reflected beam from the mirror still carries considerable power and power density. Depending on its location, the monochromator downstream of the mirror might be subject to 300 W total power and 5 W/mm2 normal incidence heat flux. Thus, it is still necessary to carefully design a monochromator that provides acceptable performance under these heat loads. A contact-cooled u-shaped monochromator may be used in this case. The main feature of the u-shaped monochromator is that, by carefully selecting the geometry and cooling locations, it passively corrects for some of the thermally induced crystal distortions. We present experimental and computational results of a contact cooled u-shaped monochromator tested on an APS undulator beamline. The results are encouraging and compare favorably with liquid- gallium internally cooled crystals.

Paper Details

Date Published: 11 December 1997
PDF: 8 pages
Proc. SPIE 3151, High Heat Flux and Synchrotron Radiation Beamlines, (11 December 1997); doi: 10.1117/12.294480
Show Author Affiliations
Wah Keat Lee, Argonne National Lab. (United States)
Patricia B. Fernandez, Argonne National Lab. (United States)
Ali M. Khounsary, Argonne National Lab. (United States)
Wenbing Yun, Argonne National Lab. (United States)
Emil M. Trakhtenberg, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 3151:
High Heat Flux and Synchrotron Radiation Beamlines
Albert T. Macrander; Ali M. Khounsary, Editor(s)

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