Design and application of coaxial wigglers in free-electron lasers

Robert H. Jackson; Monica Blank; Henry P. Freund; Dean E. Pershing; J. M. Taccetti

doi:10.1117/12.221608

25 September 1995 Design and application of coaxial wigglers in free-electron lasers

Robert H. Jackson, Monica Blank, Henry P. Freund, Dean E. Pershing, J. M. Taccetti

Proceedings Volume 2522, Electron-Beam Sources and Charged-Particle Optics; (1995) https://doi.org/10.1117/12.221608
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Robert H. Jackson, Monica Blank, Henry P. Freund, Dean E. Pershing, and J. M. Taccetti "Design and application of coaxial wigglers in free-electron lasers", Proc. SPIE 2522, Electron-Beam Sources and Charged-Particle Optics, (25 September 1995); https://doi.org/10.1117/12.221608

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KEYWORDS

Free electron lasers

Waveguides

Ferromagnetics

Magnetism

Energy efficiency

Electron beams

Amplifiers

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