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TY - UNPB AU - Seltmann, J. ED - Schaa, Volker RW ED - Tavakoli, Keihan ED - Tilmont, Manuel TI - High Heat Load Optics J2 - Proc. of MEDSI2018, Paris, France, 25-29 June 2018 C1 - Paris, France T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation T3 - 10 LA - english AB - Beamline P04 at the 6GeV storage ring PETRA-III is a XUV to soft x-ray facility in the range of 250-3000eV. High K (up to K=6.5) operation of the 5m long APPLE-2 undulator result in high on-axis heat load. The absorbed power on the first mirror will be up to 1.6 kW (100 mA ring current, linearly polarized light). This mirror is located 46 m upstream of the focal spot, therefor has optical requirements of a tangential slope error of less than 1 µrad and has to be operated under UHV-conditions. Previous FEM studies * pointed towards an internal cooling concept based on liquid nitrogen, to cope with the high heat load and the optical needs. This initial concept has been improved with further FEM simulations and the technical feasibility of a cryo-stable metal to silicon connection for the coolant was proven under vacuum conditions. PB - JACoW Publishing CP - Geneva, Switzerland ER -