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Perfect single crystals of silicon are used to monochromate the high-intensity X-ray beams in the Advanced Photon Source at Argonne National Laboratory. Depending on the crystal geometry and the insertion device, the crystal may absorb anywhere from several hundred watts to in excess of a thousand watts. To minimize the thermal distortions in the crystal, this heat must be efficiently removed. Several approaches to this problem are being developed at the APSP including the use of inclined-crystal geometries, cryogenic cooling, liquid-gallium cooling, thin crystals, and the use of diamond. Most of these approaches require coolant flow within the crystals themselves. One issue of concern is the flow-induced vibrations. Two series of tests were performed earlier for a near-prototypical gallium-cooled crystal. This LS note describes a series of tests to measure the general vibration response characteristics of a complete liquid-gallium-cooled inclined-crystal monochromator system

Identification of root cause of vibration of a liquid-gallium-cooled silicon monochromator and recommendations for abatement