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Title: Instability of wave modes in a two-stream free-electron laser with a helical wiggler and an axial magnetic field

The dispersion relation of a two-stream free-electron laser (TSFEL) with a one-dimensional helical wiggler and an axial magnetic field is studied. Also, all relativistic effects on the space-charge wave and radiation are considered. This dispersion relation is solved numerically to find the unstable interaction among the all wave modes. Numerical calculations show that the growth rate is considerably enhanced in comparison with single-stream FEL. The effect of the velocity difference of the two electron beams on the two-stream instability and the FEL resonance is investigated. The maximum growth rate of FEL resonance is investigated numerically as a function of the axial magnetic field.
Authors:
;  [1]
  1. Department of Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22227887
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; DISPERSION RELATIONS; ELECTRON BEAMS; FREE ELECTRON LASERS; INSTABILITY GROWTH RATES; MAGNETIC FIELDS; ONE-DIMENSIONAL CALCULATIONS; OPTICAL DISPERSION; RELATIVISTIC RANGE; SPACE CHARGE; TWO-STREAM INSTABILITY