Abstract
Thermal analysis of YB 66 crystal used at a third-generation light source was performed by the finite element method. It was confirmed that the effect of YB 66 crystal thickness on maximum temperature on the surface was strongly dependent on the amount of heat load due to the irradiation by the beam and the heat transfer coefficient of the back surface. It was found that the heat load to the YB 66 crystal for a practical use should be less than 0.1 W , 1.6 W/mm 2 at 1.1 keV with a front-end (FE) slit size 0.2×0.2 mm 2 , or less than 0.4 W , 2.2 W/mm 2 at 2 keV with an FE slit size 0.2×0.2 mm 2 . The photon flux was estimated to be ∼2×10 10 photons/s/0.1% B.W./100 mA at the photon energy of 1.1 and 2 keV with an FE slit size 0.2×0.2 mm 2 positioned downstream of the monochromator at the undulator beamline, such as SPring-8 BL15XU.
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