Author: Chen, J.
Paper Title Page
WEPWA055 Multipole and End-field Shimming Results of EPU46 at the TPS 2244
  • T.Y. Chung, C.-H. Chang, J. Chen, J.C. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
    NSRRC, Hsinchu, Taiwan
  Multipole error and the first and second integrals of EPU46 require shimming to fulfill the tolerance requirements of beam dynamics. In this paper, we describe the field correction, including central-field and end-field shimming procedures, and the results for EPU46 at TPS. End-pole shimming for the first and second integrals serve to adjust the beam trajectory, and magic fingers to decrease the multipole error. For the active multipole shimming for undulators of type Apple II, a trim-long-coil array is used to compensate for multipole error. This scheme efficiently eliminates a phase-dependent skew quadrupole error.