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Proceedings Paper

Emittance Acceptance In Tapered-Wiggler Free-Electron Lasers
Author(s): David Quimby; Jack Slater
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Paper 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.

Paper Details

Date Published: 16 February 1984
PDF: 8 pages
Proc. SPIE 0453, Free-Electron Generators of Coherent Radiation, (16 February 1984); doi: 10.1117/12.947082
Show Author Affiliations
David Quimby, Mathematical Sciences Northwest, Inc. (United States)
Jack Slater, Mathematical Sciences Northwest, Inc. (United States)

Published in SPIE Proceedings Vol. 0453:
Free-Electron Generators of Coherent Radiation
Charles A. Brau; Stephen F. Jacobs; Marlan O. Scully, Editor(s)

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