Emittance Acceptance In Tapered-Wiggler Free-Electron Lasers

David Quimby; Jack Slater

doi:10.1117/12.947082

16 February 1984 Emittance Acceptance In Tapered-Wiggler Free-Electron Lasers

David Quimby, Jack Slater

Proceedings Volume 0453, Free-Electron Generators of Coherent Radiation; (1984) https://doi.org/10.1117/12.947082
Event: Free-Electron Generators of Coherent Radiation, 1983, Orcas Island, United States

Abstract

A general approach to optimization of the free-electron laser interaction is used to develop the scaling of emittance and energy spread requirements for tapered wigglers optimized for highest optical gain at fixed e-beam energy extraction. The required e-beam properties are found to be quite stringent at visible wavelengths. The applicability of various methods of emittance acceptance enhancement is examined. One very promising option is a magnet canting scheme for providing two plane focusing in planar wigglers. Two-plane focusing relaxes the severe emittance requirement resulting from the need to maintain spatial overlap between the optical beam and the free-expanding e-beam. In addition, options for adjusting various system parameters for enhanced emittance acceptance, at reduced gain per unit current, are explored. Comparison of e-beam quality requirements and state-of-the-art linac capabilities shows that tapered-wiggler oscillator experiments are feasible at visible wavelengths.

Citation Download Citation

David Quimby and Jack Slater "Emittance Acceptance In Tapered-Wiggler Free-Electron Lasers", Proc. SPIE 0453, Free-Electron Generators of Coherent Radiation, (16 February 1984); https://doi.org/10.1117/12.947082

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