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TY - UNPB AU - Hardin, C.L. AU - Amores, L. AU - Carlucci-Dayton, M. AU - Cocco, D. AU - Kelez, N.M. AU - Morton, D.S. AU - Srinivasan, V.N. AU - Zhang, L. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - Optimizing X-Ray Mirror Thermal Performance Using Variable-Length Cooling for High-Repetition-Rate FELs J2 - Proc. of MEDSI2016, Barcelona, Spain, 11-16 September 2016 CY - Barcelona, Spain T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation Conference T3 - 9 LA - english AB - SLAC National Accelerator Laboratory is developing LCLS-II, a superconducting linear accelerator based free electron laser capable of a repetition rate up to 1 MHz. To deliver the FEL beam with minimal power loss and wavefront distortion, we need grazing-incidence plane mirrors with height errors below 1nm rms, under operational conditions. We also need to mitigate thermal effects of a complex photon energy-dependent thermal profile. We discuss a mirror cradle that minimizes figure error using variable length water cooling through a gallium-indium eutectic bath, and curve correction with an off-axis bender. We present thermal and mechanical analysis, design and prototyping results of figure sensitivity under bender corrections. PB - JACoW Publishing CP - Geneva, Switzerland ER -