Author: Dohlus, M.
Paper Title Page
MOP106023 Intra Bunch Train Transverse Dynamics in the Superconducting Accelerators FLASH and European XFEL 333
SPWR039   use link to see paper's listing under its alternate paper code  
 
  • T. Hellert, W. Decking, M. Dohlus
    DESY, Hamburg, Germany
 
  At FLASH and the European XFEL accelerator superconducting 9-cell TESLA cavities accelerate long bunch trains at high gradients in pulsed operation. Several RF cavities with individual operating limits are supplied by one RF power source. Within the bunch train, the low-level-RF system is able to restrict the variation of the vector sum voltage and phase of one control line below 3·10-4 and 0.06 degree, respectively. However, individual cavities may have a significant spread of amplitudes and phases. Misaligned cavities in combination with variable RF parameters will cause significant intra-pulse orbit distortions, leading to an increase of the multi-bunch emittance. An efficient model including coupler kicks was developed to describe the effect at low beam energies. Comparison with start-to-end tracking and experimental data will be shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106023  
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