Parametric excitation of surface electron cyclotron X- and O- modes by alternating electric fields

Girka, V. O.; Girka, Oleksii; Yarko, V V

doi:10.1051/epjconf/20123201009

Cited by 1 publication

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“…If there is a narrow (ϕ 0 π) slot in the metal chamber of the waveguide in an axial direction, then ASW energy is radiated through it in open space. Our calculations [28], carried out for different values of azimuthal wave number, show that damping rates of LF ASWs, caused by their radiation, are less than the growth rates of their beam instability within the range of small effective wave numbers, k ef 0.6. Thus the flux of electromagnetic power can be controlled by changing the azimuthal sizes of the slots, since in the linear approximation the damping rate caused by this process is proportional to ϕ 0 .…”

Section: Discussionmentioning

confidence: 80%

Excitation of azimuthal surface modes by annular electron beams in the electron cyclotron frequency range

et al. 2011

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Excitation of extraordinarily polarized azimuthal surface eigenwaves is shown to be possible in the electron cyclotron frequency range in waveguides with metal walls that are partially filled with cold magnetoactive plasma. Interaction of these waves with electron beams, which rotate around the plasma column in a narrow layer separating the plasma from the wall of the waveguide, is studied. Dependences of the beam instability growth rate on the waveguide parameters (plasma and beam density; value of the external steady axial magnetic field; radius of the plasma cylinder and width of the vacuum layer; magnitude and sign of azimuthal wave number) are studied numerically. Two regimes of beam instability are demonstrated: separate resonance and resonance overlapping.

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Section: Discussionmentioning

confidence: 80%