Time growth rate and field profiles of hybrid modes excited by a relativistic elliptical electron beam in an elliptical metallic waveguide with dielectric rod

Abstract

The dispersion relation of guided electromagnetic waves propagating in an elliptical metallic waveguide with a dielectric rod driven by relativistic elliptical electron beam (REEB) is investigated. The electric field profiles and the growth rates of the waves are numerically calculated by using Mathieu functions. The effects of relative permittivity constant of dielectric rod, accelerating voltage, and current density of REEB on the growth rate are presented.

Terahertz electromagnetic wave generation and amplification by an electron beam in the elliptical plasma waveguides with dielectric rod

“…30,37 Thus, the solutions of no-beam dispersion relation give the expected operating frequency of this configuration. Equation (29) presents the beam modes. These two modes are coupled via the interaction term on the right-hand side of Eq.…”

“…In this figure, the operating frequency is determined from the synchronism of Eqs. (28) and (29). Here, normalized operating frequency is x 0 a 1 /c ¼ 15.2392.…”

“…In Ref. 29, the propagation of slow waves in an elliptical metallic waveguide with a dielectric rod driven by relativistic elliptical electron beam (REEB) has been studied. It was shown that the beam can interact with the waves via Cerenkov interaction.…”

Novel mechanism for terahertz radiation by oblique colliding of two electron beams in plasma

“…Recently, a new kind of high-power THz source, called electron beam-plasma system (EBPS) has attracted wide attention [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. This THz source does not have a damage threshold as the plasma is in a highly ionized state.…”

“…Previous experiments have successfully observed powerful THz radiation from EBPS in a large magnetic confinement plasma device [16][17][18]. Meanwhile, various related THz radiation mechanisms have also been investigated [19][20][21][22][23][24][25][26][27][28][29]. It can be found that all the previous studies adopt linear schemes considering a single beam or two counterstreaming beams passing through a plasma column.…”