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An Experiment on Free Electron Laser Efficiency Enhancement with a Variable Wiggler

  • H. Boehmer
  • M. Z. Caponi
  • J. Munch
  • G. Neil
  • N. Schoen
Chapter
Part of the Ettore Majorana International Science Series book series (SLAP, volume 49)

Abstract

The demonstration of a tunable, visible wavelength, high power high efficiency laser beam is the ultimate goal of a free electron laser program. However, the current theoretical and experimental data base is so limited that it cannot support the demonstration of the long range program goals in one step. Rather, it requires the evolutionary demonstration of one or more intermediate levels of performance. In particular, it is necessary to verify experimentally the theoretical predictions of high efficiencies for free electron lasers operating in the trapped electron regime with adiabatically tapered magnetic wiggler fields and to determine the influence of operating parameters. An experiment designed to achieve this goal is outlined in this paper. A fraction of the beam electrons is trapped in the ponderomotive well formed by the wiggler and an external EM signal that is to be amplified. The wiggler amplitude and/or wavelength is then modified to extract energy from the trapped electrons. The theory of operation is sufficiently well developed at this time to permit the design of the experimental hardware required. In addition, the experiment has been designed for maximum flexibility to provide for experimental optimization and design variations which may be predicted by more elaborate analytical and numerical models currently under development.

Keywords

Trap Electron Energy Spread Free Electron Laser Relativistic Electron Beam Laser Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    H. Motz. Journal of Applied Physics 22, (1951) 527.ADSzbMATHCrossRefGoogle Scholar
  2. 2.
    N. M. Kroll and W. A. McMullin, Phys. Rev. A17, 300 (1978); P. Sprangle and R. Smith, NRL Memorandum Report 4033, Jan 1979, M. Z. Caponi, J. Munch and H. Boehmer to be published at J. Quantum Electronics VII — Addison-Eley, 1980.ADSGoogle Scholar
  3. 3.
    N. Kroll, P. Morton, M. Rozenbluth — Free Electron Lasers with Variable Parameter Wigglers — Submitted to Phys. Rev. A. — Sec. 4 (1979). Also cf.l papers by same authors at the Telluride Workshop to be published in J. Quantum Electronics VII — Addison-Weley 1980.Google Scholar
  4. 4.
    P. Sprangle, C. M. Tang and W. M. Manheimer — The Nonlinear Theory of Free Electron Lasers and Efficiency Enhancement, NRL Memorandum Report 4034. Also: Telluride Workshop, J. Q. Electronics VII — Addison Weley 1980.Google Scholar
  5. 5.
    V. V. Neil, Emittance and Transport of Electron Beams in a Free Electron Lasers, Jason Technical Report JSR-79-10, SRI Int. 79.Google Scholar

Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • H. Boehmer
    • 1
  • M. Z. Caponi
    • 1
  • J. Munch
    • 1
  • G. Neil
    • 1
  • N. Schoen
    • 1
  1. 1.TRW DSSGRedondo BeachUSA

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