Abstract: In order to utilize the full potential of high power wiggler beam lines with heat loads up to several kW and large white beam cross sections, a variety of monochromator crystal designs are in use. Either the crystal is efficiently cooled or the unwanted distortions are compensated by different means which require external control mechanisms. Based on the self-adapting crystal design developed at the Advanced Photon Source, we present a new Si-monochromator crystal and matching support structure. This design makes use of forces inside the crystal which are generated by the heat load hitting the crystal. The heat load induced distortions of the reflecting surface are compensated by these forces. Finite element calculations are the basis for the tested components. The design of the support structure, which provides the necessary mechanical and thermal boundary conditions to the crystal is shown. The present setup allows to measure and adjust the force between crystal and support. !8
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