Design and performance of a 2T permanent magnet wiggler for the Stanford Synchrotron Radiation Laboratory

Abstract

The Beamline 9 Wiggler was designed by Intermagnetics to produce a 16 milliradian fan of high energy x-rays into three experimental stations. The device has a 26 cm period and contains 7.5 full-strength periods. The minimum air gap is 2.1 cm. At minimum gap, a peak field of 1.9 Tesla and a half-period integrated field strength of ≥16.646 T-cm were specified by the Stanford Synchrotron Radiation Laboratory (SSRL). A combination of analytical, PANDIRA, and scale models were used to develop a novel ‘‘compact pole’’ magnetic design. This design achieved 2.04 T peak field while maintaining a minimum of 17.816 T-cm half-period integrated field strength. Magnetic performance of the device was confirmed through the use of an Intermagnetics-designed Hall Probe scanning system as well as by long and short coil measurements.