Abstract
Heat loading tests were conducted with up to 360 W of undulator radiation incident on liquid-gallium-cooled silicon monochromators. Rocking curve measurements and temperature profiles (infrared camera) were obtained as a function of beam current. With large heat loads, the width of the rocking curves were observed to broaden and the gain in output flux per mA of beam current was significantly less at high beam currents than during low-current operation. The best performance was obtained using a slotted crystal with cooling channels located 0.76 mm below the surface. This crystal showed strong heating effects only above 40 mA and continued to produce an increase in output flux with beam current at the highest current tested of 76 mA.
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