Author: Karabekyan, S.
Paper Title Page
WEPOY001 First Field Integral Measurement Campaign for Air Coil 2991
  • Z. Zhao, B. Du, Q.K. Jia
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • S. Karabekyan, J. Pflüger, M. Yakopov
    XFEL. EU, Hamburg, Germany
  For the operation of the air coils, which are needed for the undulator segments of the European x-ray free-electron laser (E-XFEL), precise conversion constants are needed to properly convert excitation current to steering strength. This paper describes the measurement of all 200 air coils, needed for this purpose using the short moving wire (MW) system. A LabView program was developed to measure the distribution of first field integral of both vertical (By) and horizontal (Bz) magnetic field components in the median plane of an air coil automatically. The program is an adaptation of the existing program, which was used to characterize magnetic properties of the phase shifters (PS). Before doing the measurements the new program automatically finds the centers of By and Bz components, which are found to match with the geometrical centers with sufficient accuracy. After the measuring procedure is complete, the results are presented as graphics output and final tables. It shows that the measurement results can fully meet the design requirements of E-XFEL. For all measurements the excitation current of the coils was set to 1 Ampere.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY001  
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