Coaxially fed folded foil electromagnet wiggler

A. Sneh*, E. Jerby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A simple electromagnet wiggler, constructed of copper foil windings, is presented. The design is based upon a concept that combines two conducting foils in back and forth directions, thus obtaining coaxial current feeding that cancels asymmetrical fringe fields at both ends of the wiggler. Analytical expressions for the off-axis magnetic fields are given and compared to exact numerical results and to experimental measurements. Both comparisons show high accuracy of the analytical expressions in the entire wiggler volume. Electron trajectories in the wiggler and optimal injection conditions are described and considered in this paper. A wiggler construction of λW = 2 cm that produces a 345 G peak on-axis at 1 kA feeding current is presented. The feasibility of a miniature wiggler based on this concept is discussed, and a scheme of λW = 5 mm, BW = 0.3 T (aW = 0.15), fed by a current of I = 1.5 kA, is proposed.

Original languageEnglish
Pages (from-to)294-298
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume285
Issue number1-2
DOIs
StatePublished - 10 Dec 1989

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