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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1986),
  • paper THMM5

Circularly polarized undulator with self-adaptive tapered field amplitude for free-electron lasers

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Abstract

A bifilar helix is made of a series of paired permanent magnetic blocks with spiral intersurface, which are integrated with each other continuously. A spiral magnetic pole made of industry-grade pure iron is used to homogenize the field between poles near the axis so as to construct a circularly polarized permanent magnet. Then a tapered bifilar helix winding and a gradually complemented bifilar helix winding are set on the permanent magnet to complete a circularly polarized undulator with a self-adaptive tapered field amplitude for free-electron lasers.

© 1986 Optical Society of America

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