Mode theory of the plasma cladding waveguide

Abstract

The plasma cladding waveguide, which is a cylindrical dielectric core surrounded by a plasma cladding, is developed, and the guided modes and their characteristics of this waveguide are displayed through the present detailed theoretical research. The conditions of the single mode existing in the plasma cladding waveguide have been given, and the defined forbidden gap of frequency is discussed. It is found that the usage characteristics of the plasma cladding waveguide vary strongly with plasma frequency, and changing the plasma parameters can control the propagation mode. This paper focuses on exhibiting the basic characteristics and the potential applications of this new type of waveguide.

Cherenkov electromagnetic instability excited by an oscillating relativistic electron beam in ion channel

“…26 Obviously, if we draw the electron beam out of the ion channel, the dispersion equation of beam-ion channel-plasma system degenerates into the dispersion equation of PCW. On the other hand, we can find by observing Eq.…”

“…19,20 On the other hand, whenever the velocity of electron beam exceeds or approaches the phase speed of an electromagnetic ͑EM͒ wave in the slow-wave structure, the Cherenkov radiation will be produced. [21][22][23][24][25][26][27] Some previous researches proved that the system, which results from the REB injecting into a neutral plasma, is a slowwave structure. 14,26 Thus, it is possible that the Cherenkov instability and radiation will occur in the ion-channel guiding.…”

“…[21][22][23][24][25][26][27] Some previous researches proved that the system, which results from the REB injecting into a neutral plasma, is a slowwave structure. 14,26 Thus, it is possible that the Cherenkov instability and radiation will occur in the ion-channel guiding. In this paper, we will research the feature and mechanism of the Cherenkov EM instability in the ion-channel guiding.…”