NDLI: Design, optimization and purity of permanent magnet helical wigglers for free-electron lasers

Content Provider	IEEE Xplore Digital Library
Author	Diament, P.
Copyright Year	1965
Abstract	A helical wiggler field can be produced inside a cylindrical waveguide by properly distributing and orienting an array of permanent magnets within an annular shell surrounding the waveguide. The design and optimization of such wigglers is considered herein, along with assessments of the strength and spectral purity achievable under practical constraints of equally and uniformly magnetized rare-earth cobalt magnets. Starting with the optimum continuum magnetization, a design is derived that differs from Halbach's primarily in that it includes axially directed components of magnetization. A comparison of the two approaches to helical wiggler design is made in terms of the field strength and purity each can achieve under similar constraints. The optimized design is shown to generate stronger and purer helical wiggler fields than Halbach's version for typical parameters. A modified design that uses many small magnets and does not fill the annular space is suggested and evaluated.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	1094
Ending Page	1103
Page Count	10
File Size	3745168
File Format	PDF
ISSN	00189197
Volume Number	21
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical design Design optimization Permanent magnets Undulators Free electron lasers Magnetization Waveguide lasers Magnetic fields Electron beams Sampling methods
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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