Energy and energy flux of waves with a complex phase in media with a transparency window
Abstract
An analysis is made of spatially and temporally unstable longitudinal waves, described by the dispersion equation epsilon(omega, h) (where epsilon is permittivity, omega is frequency, and h is wavenumber), in media with a transparency window. Expressions are derived for the density and flux of these waves in terms of the permittivity with spatial and temporal dispersion. It is shown that, if the process increases only in time, the expression for the energy density is equal to zero.
 Publication:

Radiofizika
 Pub Date:
 1984
 Bibcode:
 1984RaF....27..690E
 Keywords:

 Beam Waveguides;
 Electrodynamics;
 Electron Flux Density;
 Particle Beams;
 Wave Propagation;
 Electron Oscillations;
 Electron Tubes;
 Longitudinal Waves;
 Magnetohydrodynamic Stability;
 Permittivity;
 Phase Velocity;
 Transparence;
 Windows (Intervals);
 Electronics and Electrical Engineering