A cryogenically cooled channel-cut crystal monochromator using a helium refrigerator and heat exchanger
2002; American Institute of Physics; Volume: 73; Issue: 3 Linguagem: Inglês
10.1063/1.1435820
ISSN1527-2400
AutoresL. E. Berman, D. P. Siddons, P. Montanez, A. Lenhard, Zhijian Yin,
Tópico(s)Particle Accelerators and Free-Electron Lasers
ResumoSilicon 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.
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