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Proceedings Paper

Design and application of coaxial wigglers in free-electron lasers
Author(s): Robert H. Jackson; Monica Blank; Henry P. Freund; Dean E. Pershing; J. M. Taccetti
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Paper Abstract

The Naval Research Laboratory is investigating innovative magnetic wigglers to reduce beam energy requirements for millimeter wave FELs and to enhance the gain and efficiency. Recent work has focused on coaxial designs. The advantages of this are twofold. First, annular configurations are advantageous for propagating high current beams. The annular geometry permits use of the central structure to enhance the wiggler field, hence, allowing shorter wiggler periods. One such wiggler is referred to as the Coaxial Hybrid Iron (CHI) wiggler, and employs a solenoid enclosing periodic arrays of ferromagnetic and nonferromagnetic material arranged as an outer ring and an inner rod. A second wiggler uses both outer and inner bifilar helical current windings. Both wiggler designs result in substantial enhancements in the wiggler field experienced by the electron beam as compared with the fields in the absence of the central structure. A prototype CHI wiggler is discussed along with a 35 GHz amplifier experiment which is under construction. Preliminary performance calculations for a two helix wiggler system are discussed. This will include both orbit theory and a fully 3D nonlinear simulation of the interaction.

Paper Details

Date Published: 25 September 1995
PDF: 12 pages
Proc. SPIE 2522, Electron-Beam Sources and Charged-Particle Optics, (25 September 1995); doi: 10.1117/12.221608
Show Author Affiliations
Robert H. Jackson, Naval Research Lab. (United States)
Monica Blank, Naval Research Lab. (United States)
Henry P. Freund, Naval Research Lab. (United States)
Dean E. Pershing, Naval Research Lab. (United States)
J. M. Taccetti, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2522:
Electron-Beam Sources and Charged-Particle Optics
Eric Munro; Henry P. Freund, Editor(s)

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