Electron temperature effects on the eigenmodes of a plasma waveguide

Abstract

The effect of finite electron temperature on the excitation of eigenmodes of a plasma loaded cylindrical waveguide is investigated. In the analysis, a nonlinear wave equation is derived using the linearized fluid equations along with Maxwell’s equations. The general result obtained for the annular plasma column is then reduced to be used for the case in which the plasma column fills the entire waveguide as well as for a partially filled configuration. Dispersion relations for electromagnetic and electrostatic modes are solved numerically to study the effect of electron thermal velocity on the characteristics of azimuthally symmetrical eigenmodes. The numerical studies show that the thermal motion of electrons shifts the frequencies of the perturbed transverse magnetic waveguide and those of cyclotron plasma modes toward higher values.

Landau damping in a bounded magnetized plasma column

“…The HE 01 waveguide mode experiences a similar behavior to the EH 01 mode when the electron thermal velocity is taken into account. [7] As can be noticed from these figures, the electron thermal velocity has almost no effect on each of the normalized frequencies of these three modes. The dispersion characteristics of the cold plasma column (solid curves) are very similar to those presented in Refs.…”

“…More recently, the ef-fect of electron temperature on the eigenmodes of a plasmaloaded cylindrical waveguide was investigated by Aghamir and Abbasnejad. [7] Although a number of theoretical studies have been undertaken to analyze the dispersion characteristics of high-frequency guided plasma waves, [8][9][10][11] almost all of the studies are based on the fluid theory approximation. However, for plasma systems of finite temperature and finite size, the local approximation is not always valid and can miss important physical phenomenon such as Landau damping in the collisionless limit.…”

Penetration and screening of perpendicularly launched electromagnetic waves through bounded supercritical plasma confined in multicusp magnetic field

“…This is further substantiated by the fact that the measured intensity of the axial component of the wave electric field ͉͑E z ͉ 2 ͒ is an order of magnitude less than ͉B z ͉ 2 and 72% smaller than the intensity corresponding to the radial ͉͑E r ͉ 2 ͒ and polar ͉͑E ͉ 2 ͒ electric field intensities. 19 To further confirm the waveguide mode, a polar plot of the normalized average central ͉E tot ͉ 2 is obtained at the center of MC by the L-shaped bent antenna probe, both in vacuum and in the presence of plasma ͑360 W, 0.35 mTorr͒ and is shown in Fig. 5͑b͒.…”