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XFEL Injector Vacuum System Review: Enhancements for Improved Performance

Review of XFEL injector vacuum system, similarities to FLASH, requirements, operational experience, planned improvements for cathode system, gun module, drives, and overall outlook for enhanced performance. Detailed analysis of vacuum issues and recommendations for optimal operation.

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XFEL Injector Vacuum System Review: Enhancements for Improved Performance

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  1. XFEL Injector Vacuum Issues Kirsten Zapfe, Nils Mildner, Antonio Wagner Injector Review DESY/Hamburg, Oct. 23, 2006

  2. General Remarks • XFEL injector vacuum system similar to FLASH • requirements • pressure ~ 10-10 mbar •  titanium sublimation pumps •  sputter ion pumps • particle free •  cleaning of all vacuum components in clean room •  installation under local clean room Draft

  3. FLASH Injector • working system • operational experience  optimization necessary • Cathode system • preparation of cathodes in Milano • transport to DESY/storage under vacuum  careful planning required for spare • life time of cathodes longer than originally expected • vacuum conditions sufficient • exchange of cathodes done manually • room for mistakes with severe damage Improvements planned for XFEL • cathode preparation system at DESY (MIN) • improved diagnostics for exchange of cathodes

  4. FLASH Injector • Gun – 1. module • extremely compact section • limited/complicated accessibility • installation • repair work • alignment of vacuum chambers difficult • poor pumping due to limited conductance • completely compressed bellows at drive units • stability of girder

  5. FLASH Injector • Planned improvements for 2007 • replacement of vacuum chambers • more compact/stiffer diagnostic cross • increased pumping conductance • additional bellows for alignment • improved drive units

  6. FLASH Injector • Planned improvements for 2007 • new girder structure • gun/cathode system on sliding carriage

  7. Summary and Outlook • FLASH injector perfect test bed for XFEL injector • test improvements for XFEL as soon as possible • careful planning of complete system necessary • reserve sufficient space for installation of components • modular set-up for good accessibility of components • avoid patchwork installations as we do have at FLASH

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