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WEPH27 |
High Heat Load Optics | |
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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.
* Hans-B. Peters, Finite Elemente Berechnung, Silizium-Planspiegel M1 für XUV-Strahl in Petra-III, Beamline P04, DESY / Abtlg. ZM1, Hamburg, den 23.01.2008 |
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