End fields in the harmonic generation superconducting FEL at BNL-NSLS

W. S. Graves; L. Solomon; I. Lehrman

doi:10.1016/0168-9002(94)01338-1

End fields in the harmonic generation superconducting FEL at BNL-NSLS

W. S. Graves, L. Solomon, I. Lehrman

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1 Scopus citations

Abstract

A study is presented of the end fields in the harmonic generation FEL radiator. This wiggler magnet consists of 6 contiguous 25 cm long steel yokes wound with superconductor, each with 18 mm period, 0.54 T field and 8.6 mm gap. Measurement results and analyses are given for third and sixth order binomial entrance excitations. It is shown that, when the steel cores are driven into saturation, the binomial winding is no longer steering-free, and that higher order entrance windings produce less electron beam steering than do low order windings.

Original language	English (US)
Pages (from-to)	414-417
Number of pages	4
Journal	Nuclear Inst. and Methods in Physics Research, A
Volume	358
Issue number	1-3
DOIs	https://doi.org/10.1016/0168-9002(94)01338-1
State	Published - Apr 11 1995
Externally published	Yes

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ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Cite this

Graves, W. S., Solomon, L., & Lehrman, I. (1995). End fields in the harmonic generation superconducting FEL at BNL-NSLS. Nuclear Inst. and Methods in Physics Research, A, 358(1-3), 414-417. https://doi.org/10.1016/0168-9002(94)01338-1

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N2 - A study is presented of the end fields in the harmonic generation FEL radiator. This wiggler magnet consists of 6 contiguous 25 cm long steel yokes wound with superconductor, each with 18 mm period, 0.54 T field and 8.6 mm gap. Measurement results and analyses are given for third and sixth order binomial entrance excitations. It is shown that, when the steel cores are driven into saturation, the binomial winding is no longer steering-free, and that higher order entrance windings produce less electron beam steering than do low order windings.

AB - A study is presented of the end fields in the harmonic generation FEL radiator. This wiggler magnet consists of 6 contiguous 25 cm long steel yokes wound with superconductor, each with 18 mm period, 0.54 T field and 8.6 mm gap. Measurement results and analyses are given for third and sixth order binomial entrance excitations. It is shown that, when the steel cores are driven into saturation, the binomial winding is no longer steering-free, and that higher order entrance windings produce less electron beam steering than do low order windings.

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10.1016/0168-9002(94)01338-1