Numerical simulations of electrostatic instabilities in magnetron diodes

Author

Raguin, Jean-Yves

Author_Institution

Arbeitsbereich Hochfrequenztech., Technische Univ. Hamburg-Harburg, Germany

Volume

2

fYear

2001

fDate

2001

Firstpage

525

Abstract

The electron dynamics in a crossed-field cylindrical diode are analysed by using a two-dimensional code based on particle-in-cell techniques. Depending on the prescribed emission surface current of the cathode, the numerical simulations reveal the existence of two types of regime in which the system can operate: an emission limited regime and a space-charge limited regime. In both types of regime, electrostatic modes are shown to be excited, the frequencies of which being of the same order of magnitude as the cyclotron frequency. The saturated states of these instabilities result in the persistence of large-amplitude coherent structures

Keywords

diodes; electrodynamics; electrostatics; magnetrons; microwave tubes; numerical analysis; space charge; stability; 2D code; PIC techniques; cathode emission surface current; cathode surface current density; crossed-field cylindrical diode; cyclotron frequency; electron dynamics; electrostatic instabilities; electrostatic modes; emission limited regime; large-amplitude coherent structures; magnetron diodes; numerical simulations; particle-in-cell techniques; preoscillation stage; saturated states; space-charge limited regime; two-dimensional code; Anodes; Cathodes; Diodes; Electrons; Electrostatics; Frequency; Magnetic analysis; Magnetic fields; Numerical simulation; Saturation magnetization;

fLanguage

English

Publisher

ieee

Conference_Titel

Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on

Conference_Location

Kharkov

Print_ISBN

0-7803-6473-2

Type

conf

DOI

10.1109/MSMW.2001.947219

Filename

947219