Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam
Y. Park, R. Agustsson, W. J. Berg, J. Byrd, T. J. Campese, D. Dang, P., Denham, J. Dooling, A. Fisher, I. Gadjev, C. Hall, J. Isen, J. Jin, A. H., Lumpkin, A. Murokh, Y. Sun, W. H. Tan, S. Webb, K. P. Wootton, A. A., Zholents, P. Musumeci
TL;DR
This paper presents the design and construction of a tapered helical undulator system optimized for high-efficiency ultraviolet radiation generation from a high-brightness electron beam at Argonne National Laboratory.
Contribution
It introduces a novel hybrid quadrupole design and an optimized tapering profile for the undulator to enhance energy conversion efficiency.
Findings
Achieved efficient energy transfer to 257.5 nm radiation
Designed a flexible quadrupole focusing system
Optimized tapering profile for maximum efficiency
Abstract
In this paper we discuss the design choices and construction strategy of the tapered undulator system designed for a high energy extraction efficiency experiment in the ultraviolet region of the electromagnetic spectrum planned for installation at the Argonne National Laboratory Linac Extension Area (LEA) beamline. The undulator is comprised of 4 sections pure permanent magnet Halbach array separated by short break sections, each one of them housing a focusing quadrupole doublet and a phase shifter. The quadrupoles use a novel hybrid design which allows one to vary the gradient and match the beam transversely. The undulator tapering profile is optimized to maximize the energy conversion efficiency from a 343 MeV 1 kA beam into coherent 257.5 nm radiation taking into account the longitudinal current profile generated by the linac.
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