Magnetic measurements of the X25 and X21 wigglers at the NSLS [National Synchrotron Light Source]

Between June 1988 and February 1989, three permanent magnet hybrid insertion devices were installed into the X-Ray ring at the National Synchrotron Light Source at Brookhaven National Lab as part as of the Phase 2 facility upgrade. The three magnets consist of a soft x-ray undulator (SXU) and two hybrid wigglers, with peak fields of 0.35 and 1.2 Tesla respectively. Prior to these installations magnetic measurements were performed at the NSLS Magnetic Measurements Lab in order to determine the operating values for the end corrector currents, the field quality, and the integrated multipoles associated with the magnet as a function of gap. Transfer function measurements were also carried out to determine the relative importance of the various block errors, and to determine block placement within the magnet body. BNL-44921 documents the measurements on the SXU magnet. This report presents the results of some of these measurements on the X21 and X25 magnets; the measurements performed on these magnets were limited by scheduling concerns. 10 figs., 7 tabs