Author/Authors :
Asakawa، نويسنده , , M. and Inoue، نويسنده , , N. and Mima، نويسنده , , K. and Nakai، نويسنده , , S. and Imasaki، نويسنده , , K. and Fujita، نويسنده , , M. and Chen، نويسنده , , J. and Yamanaka، نويسنده , , C. and Nakao، نويسنده , , N. and Agari، نويسنده , , T. and Asakuma، نويسنده , , and T. K. Moon، نويسنده , , A. and Ohigashi، نويسنده , , N. and Minamiguchi، نويسنده , , T. and Tsunawaki، نويسنده , , Y.، نويسنده ,
Abstract :
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.
