Abstract

The end effects and focusing ability of a double bifilar helix linearly polarized wiggler are analyzed and demonstrated. The period of the wiggler used in experiments is 3.2 cm. On EPA-74, with 600 keV electron energy, the transported beam, with no external focusing, is 30 A at 23 wiggler periods. The results show that the fields at both ends of the wiggler, with no tapering, can be reasonably smooth and helically symmetric, and the wiggler is capable of focusing an intense relativistic electron beam.

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