High-frequency fluctuations of a modulated, helical electron beam | Zendy

M. A. Reynolds | Zendy; G. J. Morales | Zendy

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High-frequency fluctuations of a modulated, helical electron beam

Author(s) -

M. A. Reynolds,

G. J. Morales

Publication year - 1996

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.872039

Subject(s) - physics , harmonics , cyclotron , electron , atomic physics , beam (structure) , plasma , lower hybrid oscillation , magnetic field , plasma oscillation , cathode ray , electromagnetic radiation , cyclotron radiation , electromagnetic electron wave , computational physics , optics , voltage , nuclear physics , quantum mechanics

The high‐frequency electromagnetic field generated by a density‐modulated, helical electron beam propagating in a magnetized plasma is calculated. The magnetic fluctuations are found to exhibit spatially localized (evanescent) resonances at harmonics of the electron‐cyclotron frequency, whose width is determined by the pitch angle of the beam, and whose existence is a consequence of the helical geometry. In addition, electrostatic modes are radiated near the hybrid frequencies, and electromagnetic modes are radiated above the upper‐hybrid frequency. The predicted frequency spectrum and mode structure in configuration space are in good agreement with experimental observations of discrete emission lines at the electron‐cyclotron harmonics [Phys. Fluids B 5, 3789 (1993)].

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