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Physics of Plasmas / Volume 14 / Issue 5 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 14, 053106 (2007); doi:10.1063/1.2731318 (9 pages)

Unstable coupled-mode structures in a one-dimensional Raman free-electron laser

T. Mohsenpour1, B. Maraghechi1, and S. Mirzanejhad2

1Department of Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
2Department of Physics, Faculty of Basic Sciences, Mazandaran University, Babolsar, Iran

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(Received 21 November 2006; accepted 26 March 2007; published online 17 May 2007)

The dispersion relation of a free-electron laser (FEL) with a one-dimensional helical wiggler and an axial guide magnetic field, in the collective regime, is used to study interactions among all possible waves. In group II orbits, with relatively large wiggler induced velocities, new couplings between the negative and positive-energy space-charge waves as well as between the right and left circularly polarized electromagnetic waves are found. These instabilities are found to be distinct from the usual FEL resonance. The space-charge wave was not found to be intrinsically unstable when it couples to the electromagnetic wave and the coupling to the radiation was found to be the only way that makes it unstable.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. LINEARIZED EQUATIONS
  3. DISPERSION RELATION
  4. COUPLING BETWEEN RIGHT AND SPACE-CHARGE WAVES
  5. COUPLINGS AMONG ELECTROMAGNETIC AND SPACE-CHARGE WAVES
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

free electron lasers, laser theory, laser modes, Raman lasers, dispersion relations, wigglers, space charge waves, electromagnetic waves

PACS

ARTICLE DATA

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http://link.aip.org/link/doi/10.1063/1.2731318

PUBLICATION DATA

ISSN:

1070-664X (print)  
1089-7674 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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