Cyclotron-Cherenkov and Cherenkov instabilities

Author

Kho, T.H. ; Lin, A.T.

Author_Institution

Dept. of Phys., California Univ., Los Angeles, CA, USA

Volume

18

Issue

3

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

513

Lastpage

517

Abstract

The effect of the conventional Cherenkov instability on the cyclotron-Cherenkov maser is investigated for the case of a relativistic electron beam propagating along a background magnetic field in a dielectric using particle simulations. Both Cherenkov and cyclotron-Cherenkov instabilities are excited when the phase velocity of light in the dielectric is less than the beam velocity. It is demonstrated in the high-power regime, where the cyclotron-Cherenkov mode has the higher growth rate, that the Cherenkov mode has little effect on the nonlinear efficiency of the cyclotron-Cherenkov mode. High-efficiency is possible, confirming previous predictions based on single mode calculations. The effect of beam momentum spread is studied

Keywords

Cherenkov radiation; masers; relativistic electron beam tubes; stability; Cherenkov instabilities; beam momentum spread; cyclotron-Cherenkov maser; model; nonlinear efficiency; particle simulations; phase velocity; relativistic electron beam; Cyclotrons; Dielectrics; Electromagnetic waveguides; Electron beams; Frequency; Magnetic fields; Masers; Optical coupling; Optical propagation; Particle beams;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.55922

Filename

55922