{open_quotes}Optical Guiding{close_quotes} limits on extraction efficiencies of single-pass, tapered wiggler amplifiers

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Single-pass, tapered wiggler amplifiers have an attractive feature of being able, in theory at least, of extracting a large portion of the electron beam energy into light. In circumstances where an optical FEL wiggler length is significantly longer than the Rayleigh length Z{sub R} corresponding to the electron beam radius, diffraction losses must be controlled via the phenomenon of optical guiding. Since the strength of the guiding depends upon the effective refractive index n exceeding one, and since (n-1) is inversely proportional to the optical electric field, there is a natural limiting mechanism to the on-axis field strength and thus ... continued below

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3 p.

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Fawley, W.M. August 1, 1995.

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Single-pass, tapered wiggler amplifiers have an attractive feature of being able, in theory at least, of extracting a large portion of the electron beam energy into light. In circumstances where an optical FEL wiggler length is significantly longer than the Rayleigh length Z{sub R} corresponding to the electron beam radius, diffraction losses must be controlled via the phenomenon of optical guiding. Since the strength of the guiding depends upon the effective refractive index n exceeding one, and since (n-1) is inversely proportional to the optical electric field, there is a natural limiting mechanism to the on-axis field strength and thus the rate at which energy may be extracted from the electron beam. In particular, the extraction efficiency for a prebunched beam asymptotically grows linearly with z rather than quadratically. We present analytical and numerical simulation results concerning this behavior and discuss its applicability to various FEL designs including oscillator/amplifier-radiator configurations.

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3 p.

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INIS; OSTI as DE96002560

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  • 17. international free electron laser conference, New York, NY (United States), 21-25 Aug 1995

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  • Other: DE96002560
  • Report No.: LBL--37095
  • Report No.: CONF-9508156--4
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 135114
  • Archival Resource Key: ark:/67531/metadc622285

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  • August 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 12:01 p.m.

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Fawley, W.M. {open_quotes}Optical Guiding{close_quotes} limits on extraction efficiencies of single-pass, tapered wiggler amplifiers, article, August 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc622285/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.