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 h as 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 abou t 250 in 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 multipo le wiggler, two minipole undulators and a superconducting wiggler. We studi ed the linear effects of these devices. In addition, we studied the nonline ar effects of 27 in undulator because this undulator has the most dominant nonlinear effects on the beam among all the undulators. (C) 2001 Elsevier S cience B.V. All rights reserved.