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

Abstract

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.

Authors:
; ;  [1];  [2]
  1. Department of Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran (Iran, Islamic Republic of)
  2. (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
20975002
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2731318; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DISPERSION RELATIONS; ELECTROMAGNETIC RADIATION; FREE ELECTRON LASERS; INSTABILITY; INTERACTIONS; MAGNETIC FIELDS; ONE-DIMENSIONAL CALCULATIONS; RESONANCE; SPACE CHARGE

Citation Formats

Mohsenpour, T., Maraghechi, B., Mirzanejhad, S., and Department of Physics, Faculty of Basic Sciences, Mazandaran University, Babolsar. Unstable coupled-mode structures in a one-dimensional Raman free-electron laser. United States: N. p., 2007. Web. doi:10.1063/1.2731318.
Mohsenpour, T., Maraghechi, B., Mirzanejhad, S., & Department of Physics, Faculty of Basic Sciences, Mazandaran University, Babolsar. Unstable coupled-mode structures in a one-dimensional Raman free-electron laser. United States. doi:10.1063/1.2731318.
Mohsenpour, T., Maraghechi, B., Mirzanejhad, S., and Department of Physics, Faculty of Basic Sciences, Mazandaran University, Babolsar. Tue . "Unstable coupled-mode structures in a one-dimensional Raman free-electron laser". United States. doi:10.1063/1.2731318.
@article{osti_20975002,
title = {Unstable coupled-mode structures in a one-dimensional Raman free-electron laser},
author = {Mohsenpour, T. and Maraghechi, B. and Mirzanejhad, S. and Department of Physics, Faculty of Basic Sciences, Mazandaran University, Babolsar},
abstractNote = {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.},
doi = {10.1063/1.2731318},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}