SSRF Phase-I Insertion Devices

Shanghai Light Source (SSRF) is a third generation synchrotron radiation facility with the intermediate energy of 3.5 GeV. Two wigglers W80 and W140, one elliptically polarizing undulator EPU100 of the APPLE-II type with 4.3 meters long and two in-vacuum undulators IVU25-1,2 with 2 meters long have been built in the phase-I of SSRF project. This paper describes the design parameters, the magnet configurations and the magnetic field performances of these five IDs. The electron trajectories, the phase errors and the predicated on-axis spectral fluxes with the measured magnetic fields of two in-vacuum undulators are also presented. The R.M.S. phase errors of less than 4 are obtained for the EPU100 in the horizontal polarization mode as well as in the vertical polarization mode. The maximum R.M.S. phase errors for two in-vacuum undulators are 3.1 and 2.2?? respectively and the ratio of the photon flux to the ideal case is larger than 80% on the 11th harmonic.