Abstract
Undulators for Free Electron Laser (FEL) amplifiers driven by multi-GeV electron beams generally require superimposed focusing substantially stronger than that provided by their natural focusing fields. In recent years a wide variety of focusing schemes and configurations have been proposed for undulators of this class, ranging from conventional current-driven quadrupoles external to the undulator magnets to permanent magnet (PM) lattices inserted into, or adjacent to, the insertion device gap. In this paper we present design studies of the field structure of a flexible hybrid/PM undulator with superimposed planar PM focusing proposed for a 1.5 Å Linac Coherent Light Source (LCLS) undulator driven by an electron beam with a 1 mm mrad normalized emittance. Attainable field parameters, tuning modes, and trajectory performance of the proposed structure are discussed.
Published Version
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