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TY - UNPB AU - Zhang, L. AU - Cocco, D. AU - James, J.H. AU - Kelez, N.M. AU - Morton, D.S. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - Minimization of Mechanical Constraint Effects of Eutectic GaIn as Thermal Interface 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 - Eutectic Gallium-Indium (eGaIn: 75% Gallium + 25 Indium) is widely used as the thermal interface in water-cooled X-ray optics. The thermal contact resistance of the eGaIn can be smaller than 0.1 mm2. K/W. The LCLS-II KB mirrors will be water cooled, and mostly dynamically bendable. The requirement on the bending accuracy can be expressed as residual slope error after the subtraction of the ideal ellipsoidal shape. This residual slope error should be smaller than 0.1rad, which is at least 4 orders of magnitude smaller than the mirror bent slope. Therefore, the mechanical constraint force from the eGaIn interface should be at least 4, and mostly 5 orders of magnitude smaller than the bending forces with the bending arm length comparable to the mirror length. But what is the mechanical constraint force of the eGaIn interface? What are the mechanical properties of the eGaIn in terms of Youngs or shear modulus. How should this eGaIn interface optimized, for instance the thickness of this interface? In this paper, we will present experimental studies conducted at SLAC to answer these questions, and propose a solution to minimize the constraint forces of the eGaIn. PB - JACoW Publishing CP - Geneva, Switzerland ER -