Performance of an Elliptical Polarization Undulator in TPS

Abstract

The advantages of an APPLE-II elliptically polarized undulator (EPU) are a wide range of tuneable energy and a large polarization rate. National Synchrotron Radiation Research Center (NSRRC) therefore decided to install a 4-m EPU with period length 46 mm at a beamline for soft x-rays in Taiwan Photon Source. Magnetic-field shimming was developed; the final magnetic performances of the phase error, electron trajectory and multipole errors are presented in this paper.