Thermal analysis of LN2-cooled silicon crystals for Energy Recovery Linac monochromators

We discuss major features of the predicted power distribution in undulator beams at the proposed Cornell Energy Recovery Linac, and the anticipated consequences for monochromator performance. Finite element analysis of thermal deformation of LN2-cooled Si crystal monochromators for the ERL is summarized. A new metric, the modified linear power density, is found to provide a clear description of crystal thermal deformation.