ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A fixed-exit double crystal monochromator based on one rotation has been designed for an absorption spectroscopy beamline. The first crystal is mounted in the center of rotation, while the second crystal is translated by simple mechanical means. This change of the gap distance d keeps the beam offset constant. The second crystal is tuned by a simple digital feedback system, which allows us to control both θ and χ. The first crystal is mounted in the center of rotation to improve its cooling compared to the existing boomerang design, which only allows indirect cooling. In the present design, the cooling lines are fixed on the circle and are moved together with the crystal, so that no additional force acts on the crystal. The monochromator has been tested between 5 and 11 keV for the Si(111) reflection and between 6.5 and 8 keV for the Si(333) reflection. The beam motions were less than 300 μm with the mechanism not optimized. Measurements of the Cu K edge extended x-ray absorption fine structure in CuO gave the same result as from a conventional double crystal channel-cut crystal. See J. A. Golovchenko, R. A. Levesque, and P. L. Cowan, Rev. Sci. Instrum. 52, 509 (1981). © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1448157
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