Development Of A Modified Wiggler For Higher Harmonic Lasing Of A Free-Electron Laser

M. Asakawa,N. Inoue,K. Mima,S. Nakai,K. Imasaki,M. Fujita,J. Chen,C. Yamanaka,N. Nakao,T. Agari,T. Asakuma,A. Moon,N. Ohigashi,T. Minamiguchi,Y. Tsunawaki

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（1995）

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摘要

A modified wiggler, with enhanced harmonic fields, was developed for free-electron laser higher harmonic lasing. The harmonic wiggler field was produced by arranging high-permeability shims in the gap spacing of a four-block-per-period Halbach design wiggler. By this method, the 3rd harmonic wiggler field exceeded 18% of the fundamental field. The phasing of the harmonic field could be also controlled by the positioning of the shims.

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关键词

higher harmonic lasing,wiggler,laser,free-electron

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