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Decking, W.

   
Paper Title Page
WG104 Study of Dynamic Aperture for PETRA III Ring  
 
  • Y. J. Li, K. Balewski, W. Decking
    DESY, Hamburg
 
  PETRA III is a low emittance storage ring dedicated to synchrotron radiation. Twenty damping wigglers with a total length of 80 m are used to reduce horizontal emittance to 1 nm rad. For efficient injection in so called top-up mode, the dynamic aperture should be larger than 30 mm·mrad in horizontal plane. This paper presents the beam dynamics study for the damping wigglers, the choice of suitable tunes of machine, and the optimization of sextupoles configuration. The simulation results including magnetic errors and misalignment will be given.  
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WG304 Dispersion measurement and correction in the VUV-FEL  
 
  • E. Prat, W. Decking, T. Limberg
    DESY, Hamburg
 
  Increase in transverse beam size in the undulator caused by dispersive effects is one of the major limitations for the operation of the VUV-FEL at DESY. Sources of the (spurious) dispersion are field errors and stray magnet fields in the undulator beam line as well as spurious dispersion created upstream of the undulator by, for instance, rf coupler kicks, magnet misalignments and field errors. In this contribution, a procedure for dispersion measurement and correction is described and simulations and first experimental results for the VUV-FEL are presented.  
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WG324 Single Bunch Emittance Preservation in XFEL Linac 33
 
  • V. M. Tsakanov, G. A. Amatuni
    CANDLE, Yerevan
  • R. Brinkmann, W. Decking
    DESY, Hamburg
 
  The single bunch emittance preservation in booster and main linacs of European XFEL project is presented. The wakefield and chromatic dilution of the beam emittance caused by free betatron oscillations, cavity and modules offset misalignments and random tilts are evaluated. The effects of cavities misalignments correlation along the linac are discussed. The effects of quadrupole misalignments and the corresponding trajectory steering based on one-to-one correction technique are given. The residual chromatic emittance dilution of the corrected trajectory is evaluated.  
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