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Proceedings Paper

Experimental results with cryogenically cooled thin silicon crystal x-ray monochromators on high heat flux beamlines
Author(s): Carey Shawn Rogers; Dennis M. Mills; Wah Keat Lee; Patricia B. Fernandez; Timothy Graber
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Paper Abstract

A novel, silicon crystal monochromator has been designed and tested for use on undulator and focused wiggler beamlines at third-generation synchrotron sources. The crystal utilizes a thin, partially transmitting diffracting element fabricated within a liquid-nitrogen cooled, monolithic block of silicon. This report summarizes the results from performance tests conducted at the European Synchrotron Radiation Facility (ESRF) using a focused wiggler beam and at the Advanced Photon Source (APS) on an undulator beamline. These experiments indicate that a cryogenic crystal can handle the very high power and power density x-ray beams of modern synchrotrons with sub-arcsec thermal broadening of the rocking curve. The peak power density absorbed on the surface of the crystal at he ESRF exceeded 90 W/mm2 with an absorbed power of 166 W, this takes into account the spreading of the beam due to the Bragg angle of 11.4 degrees. At the APS, the peak heat flux incident on the crystal was 1.5 W/mA/mm2 with a power of 6.1 W/mA for a 2.0 H X 2.5 V mm2 beam at an undulator gap of 11.1 mm and stored current up to 96 mA.

Paper Details

Date Published: 21 November 1996
PDF: 10 pages
Proc. SPIE 2855, High Heat Flux Engineering III, (21 November 1996); doi: 10.1117/12.259830
Show Author Affiliations
Carey Shawn Rogers, Argonne National Lab. (United States)
Dennis M. Mills, Argonne National Lab. (United States)
Wah Keat Lee, Argonne National Lab. (United States)
Patricia B. Fernandez, Argonne National Lab. (United States)
Timothy Graber, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 2855:
High Heat Flux Engineering III
Ali M. Khounsary, Editor(s)

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