Author: La Civita, D.
Paper Title Page
Mechanical Aspects of the New Shutter Design at European XFEL  
  • N. Kohlstrunk, M. Di Felice, M. Dommach, D. La Civita, H. Sinn, M. Vannoni, F. Yang
    EuXFEL, Hamburg, Germany
  • W. Clement
    DESY, Hamburg, Germany
  The European XFEL is a research facility which started operation in September 2017 and generates ultrashort X-ray flashes for photon science experiments with an outstanding peak brilliance. To operate the facility at full performance, an upgrade of the radiation safety system is needed. For this purpose nine Frontends and three Shutters have to be modified. This upgrade includes several mechanical changes like the replacement of the B4C absorber with a diamond and B4C absorber. Since also a new burn through monitor with a graphite block inside has to be installed in the absorber chamber the holder of the B4C has to be changed because of the space constraints in the chamber. This holder consists also of a special flexure plate fixed with springs and screws to allow a certain flexibility of the B4C. For attaching the CVDs to the absorber holder a special CVD clamp system has to be created to release the stress on the diamond and avoid their destruction.  
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THOB02 Heat Load Simulation of Optic Materials at European XFEL 357
  • F. Yang, D. La Civita, H. Sinn, M. Vannoni
    EuXFEL, Schenefeld, Germany
  The European XFEL GmbH, located in Hamburg area in Germany, is the X-ray free electron laser light source which has been in the operation since 2017. It is designed to provide users high intensity X-ray beam with 27000 pulses/s repetition rate in the photon energy range from 0.5 to 25 keV*. In the beam transport system, the optic components which have direct contact with the beam, e.g. mirror, absorber and beam shutter, etc., could get up to 10 kW heat load on a sub-mm spot in 0.6 ms. Therefore, the thermo-mechanical performance of these optic components is playing an important role in the safety operation of the facility, restricting the maximum allowed beam power delivered to each experiment station. In this contribution, using finite element simulation tools, a parametric study about coupled thermo-mechanical behavior of some general used materials, e.g. CVD diamond, B4C, silicon, etc. is presented. Based on the design of several devices which are already in operation at European XFEL**, an initial damage threshold for these materials is established, with respect to the corresponding beam parameters. Furthermore, the relevant analytical and numerical solutions are discussed and compared, taking the material and geometrical nonlinearities into account. These simulation results can be referred as design and operation benchmark for the optic elements in the beamlines.
*Altarelli, M. et al., The XFEL Technical Design Report, 2006.
**Tschentscher, Th. et al., Photon Beam Transport and Scientific Instruments at the European XFEL, Applied Sciences 7(6):592, 2017.
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About • paper received ※ 21 July 2021       paper accepted ※ 28 September 2021       issue date ※ 29 October 2021  
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