A cryogenically cooled channel-cut crystal monochromator using a helium refrigerator and heat exchanger

被引:5
作者
Berman, LE [1 ]
Siddons, DP [1 ]
Montanez, PA [1 ]
Lenhard, A [1 ]
Yin, ZJ [1 ]
机构
[1] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA
关键词
D O I
10.1063/1.1435820
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Silicon crystals at room temperature employed as x-ray monochromators on synchrotron radiation beamlines, when subjected to high-power-density loading, suffer thermal distortions which compromise their x-ray diffraction efficiency and result in a reduction of the inherent brilliance of the synchrotron beam. At cryogenic temperatures however (below 150 K), silicon crystals suffer little or no thermal distortions under high-power-density loading. The design and implementation of a channel-cut silicon crystal monochromator which is cooled to as low as 50 K, using a commercial helium refrigerator and circulation system and a custom-designed heat exchanger for the monochromator crystal, are described. Test results have been obtained on the National Synchrotron Light Source X13B in-vacuum undulator beamline as well as the higher power X25 wiggler beamline. (C) 2002 American Institute of Physics.
引用
收藏
页码:1481 / 1484
页数:4
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