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TY - UNPB AU - Villanueva Guerrero, J.R. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - Noble Gases Flow Management in the European XFEL Project UHV Photon Transport System 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 - The European XFEL facility in Hamburg is based on a linear accelerator and three Free-Electron-Laser beam-lines covering the energy range from 250 eV to 24 keV. It will provide 2700 pulses in trains of 600 microsecond duration at a repetition rate of 10 Hz. For the photon beam diagnostics, several gas-based devices have been developed and placed in the beam transport system. They operate with different noble gases (Xe, Ne, Ar) with pressures up to 1·10⁻⁴ mbar. Having a windowless beam-line, and a limited capability for noble gases that can be provided by the distributed array of ion pumps sustaining the UHV environment, a turbo-molecular based differential pumping section has been developed. This modular system is able to minimize the gas flow to the rest of the beam transport system, also offering a large optical clear aperture between pumping stages, and enabling the required installation and alignment flexibility in all the tunnel locations (up to 10), including variations as floor and ceiling-mounted versions. An overview of the vacuum system analysis, validation procedures, and structural and alignment concept, as well as installation status is reported. PB - JACoW Publishing CP - Geneva, Switzerland ER -