The effects of the insertion devices at the VSX light source

The VSX ring is a third-generation VUV and soft X-ray light source, which has 0.75 nm rad emittance for the ultra-low emittance mode at 1.0 GeV and 5.6 nm rad emittance for the low emittance mode at 1.6 GeV. The ring has about 250 m circumference and twelve straight sections, two of which are 29 m, four 5.4 m, four 2.3 m and two 2 m. The insertion devices to be installed are a 27 m long undulator, three 5 m undulators, a 4 m undulator, a multipole wiggler, two minipole undulators and a superconducting wiggler. We studied the linear effects of these devices. In addition, we studied the nonlinear effects of 27 m undulator because this undulator has the most dominant nonlinear effects on the beam among all the undulators.