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free-electron-laser

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TUP036 Large Grain Superconducting RF Cavities at DESY superconductivity, superconducting-RF, scattering, RF-structure 327
 
  • W. Singer, A. Brinkmann, J. Iversen, G. Kreps, A. Matheisen, D. Reschke, X. Singer
    DESY, Hamburg
  The DESY R&D program on cavities fabricated from large grain niobium explores the potential of this material for the production of approx. 1000 nine-cell cavities for the European XFEL. The program investigates both, the basic material properties comparing large grain material to standard sheet niobium and the material availability, fabrication and preparation aspects. Several single-cell cavities of TESLA shape have been fabricated from large grain niobium. A gradient up to 41 MV/m at Q0 = 1.4·1010 (TB = 2K) was measured after electropolishing. Recently the first large grain nine-cell cavities worldwide have been produced under contract of DESY with ACCEL Instruments Co. The first cavity is already tested with an accelerating gradient of 29 MV/m after BCP (Buffered Chemical Polishing) treatment.  
 
WE1003 The TTF/VUV-FEL (FLASH) as the Prototype for the European XFEL Project linac, laser, electron, radiation 486
 
  • H. Weise
    DESY, Hamburg
  The European X-ray Free-Electron Laser Facility (XFEL) is going to be built in an international collaboration at the Deutsches Elektronen-Synchrotron (DESY), Germany. The Technical Design Report was published recently. The official project start will be before end of this year. The new facility will offer photon beams at wavelengths as short as 1 Angstroem with highest peak brilliance being more than 100 million times higher than present day synchrotron radiation sources. The radiation has a high degree of transverse coherence and the pulse duration is reduced from ~100 picoseconds down to the ~10 femtosecond time domain. The overall layout of the XFEL will be described. This includes the envisaged operation parameters for the linear accelerator using superconducting TESLA technology. The complete design is based on the actually operated VUV Free-Electron Laser at DESY. Experience with the operation during first long user runs will be described in detail. Many of the different subsystems of the XFEL could be tested. Specially developed electron beam diagnostics was commissioned. A summary of the status of the XFEL preparation work will be given.  
 
TH3002 Normal-Conducting Energy Recuperator emittance, electron, linac, optics 554
 
  • A. N. Matveenko, N. Vinokurov
    BINP SB RAS, Novosibirsk
  Energy recovery linacs (ERLs) for different applications were discussed intensively at last decade. The normal conducting RF ERLs offer the possibility to provide high average currents at relatively low beam energies and long electron bunches. The comparison of normal conducting and superconducting RF is described briefly. To illustrate some interesting features of normal conducting ERLs some details of design, operational experience and prospects of the Novosibirsk FEL ERL are presented.