HIGH HEAT LOAD MONOCHROMATOR DEVELOPMENT AT THE ADVANCED PHOTON SOURCE

The Advanced Photon Source (APS) has embarked on a systematic program in high heat load x-ray monochromator optics to mitigate the thermal e ffects due to the powerful x-ray beams at third-generation synchrotron sources. This program includes both experimental and computational st udies. The approaches being studied include the use of new coolants (c ryogens and liquid gallium), new crystal geometries (inclined and vari able asymmetric), and new materials (diamond). The paper summarizes th e high heat load monochromator program at the APS.