Permanent-magnet structures

Periodic permanent-magnet structures are at the heart of many future radiation sources. These include sources of both coherent and incoherent radiation - wigglers, undulators, several approaches to free-electron lasing, and transverse optical klystrons. Important issues include controlling field errors, achieving strong fields at moderate cost, and coping with the details of fringe field control. Among our many studies and design projects, several stand out: the Livermore wiggler project for Beamline VIII at SSRL, a collaboration with AT and T Bell Laboratories to study the effects of field errors in long undulators, the design of a microwave FEL undulator to be used at Livermore, and the design of a crossed undulator pair for polarization control at NSLS