Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam
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.
Keywords
Cite
@article{arxiv.2111.11594,
title = {Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam},
author = {Y. Park and R. Agustsson and W. J. Berg and J. Byrd and T. J. Campese and D. Dang and P. Denham and J. Dooling and A. Fisher and I. Gadjev and C. Hall and J. Isen and J. Jin and A. H. Lumpkin and A. Murokh and Y. Sun and W. H. Tan and S. Webb and K. P. Wootton and A. A. Zholents and P. Musumeci},
journal= {arXiv preprint arXiv:2111.11594},
year = {2022}
}