Cooled silicon crystal monochromator test results

High energy insertion devices, used as x-ray monochromators on synchrotron storage rings, require high performance cooling of the primary optic. Monocrystalline materials, such as silicon, inherently provide crystal lattice properties suitable for x-ray diffraction. Silicon, provides excellent thermal and structural properties as well. Free electron lasers also require high performance heat exchanger technology for mirrors. A highly efficient approach to cooling, called pin post cell, was developed and fully validated in silicon. However, an additional criteria is imposed on the optic when used as a diffractive crystal. The crystalline structure of the material must not be altered during any step of fabrication. A test program has been completed which evaluated the existing fabrication technology for crystal lattice distortion. X-ray diffraction test results are presented. Currently, the authors are fabricating an actively cooled crystal that will undergo dynamic testing on the CHESS F2 beamline later this summer