Author: JunTune, C.
Paper Title Page
THPC177 Field Correction Results from NSRRC Elliptically Polarized Undulator 46 3317
  • J.C. Huang, C.-H. Chang, C.-S. Hwang, C. JunTune, F.-Y. Lin
    NSRRC, Hsinchu, Taiwan
  Elliptically polarized undulator (EPU) is a common insertion device to use in storage ring in order to provide circular polarization. The field correction is an essential step for EPU construction, and it can prevent the photon flux reduction from idea case and electron beam trajectory and exit angle from EPU. The conventional field correction method is tedious works and strongly based on experiences. An initial state of NSRRC EPU46 has phase error over 40 degrees, and many difficulties on field correction to reduce the phase error under 5 degrees. This paper will describe the detailed magnetic field correction process and practical results from in NSRRC EPU.