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- Title
A thermal deformation optimization method for cryogenically cooled silicon crystal monochromators under high heat load.
- Authors
Jiayin Liu; Zhan Ji; Yichen Fan; Xinxin Yan; Miaomiao Wang; Hongliang Qin
- Abstract
A method to optimize the thermal deformation of an indirectly cryo-cooled silicon crystal monochromator exposed to intense X-rays at a low-emittance diffraction-limited synchrotron radiation source is presented. The thermalinduced slope error of the monochromator crystal has been studied as a function of heat transfer efficiency, crystal temperature distribution and beam footprint size. A partial cooling method is proposed, which flattens the crystal surface profile within the beam footprint by modifying the cooling contact area to optimize the crystal peak temperature. The optimal temperature varies with different photon energies, which is investigated, and a proper cooling strategy is obtained to fulfil the thermal distortion requirements over the entire photon energy range. At an absorbed power up to 300 W with a maximum power density of 44.8 W mm-2 normal incidence beam from an in-vacuum undulator, the crystal thermal distortion does not exceed 0.3 mrad at 8.33 keV. This method will provide references for the monochromator design on diffraction-limited synchrotron radiation or free-electron laser light sources.
- Subjects
SILICON crystals; MONOCHROMATORS; HEATING load; SYNCHROTRON radiation sources; ENTHALPY; TEMPERATURE distribution
- Publication
Journal of Synchrotron Radiation, 2024, Vol 31, Issue 2, p260
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577523010664