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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