Author: Li, Y.
Paper Title Page
WEP054 Control of Gap Dependent Phase Errors on the Undulator Segments for the European XFEL 685
  • Y. Li, J. Pflüger
    XFEL. EU, Hamburg, Germany
  Strong magnetic forces in long undulators always result in some girder deformation. This problem gets more serious in long gap tuneable undulators. In addition the deformation varies with changing forces at different gaps resulting in gap dependent phase errors. For the undulators for the European XFEL this problem has been studied thoroughly and quantitatively. A compensation method is presented which uses a combination of suitable shims and pole height tuning. It is exemplified by tuning one of the undulator segments for the European XFEL back to specs.  
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