Effect of emission inhomogeneities on low-frequency oscillations in gyrotron-type electron beams

Author

Ilyin, V.N. ; Louksha, O.I. ; Mjasnikov, V.E. ; Popov, L.G. ; Sominski, G.G.

Author_Institution

GYCOM Ltd, Moscow, Russia

Volume

2

fYear

1998

fDate

1998

Firstpage

800

Abstract

Plasma heating in large tokamaks is one of the most attractive applications for millimeter wave gyrotrons. Gyrotrons designed and created in Russia for this purpose have megawatt microwave power level in quasi-CW regime (in single pulses with duration t>1s). Their effective operation is impeded by low-frequency (~100 MHz) spurious oscillations of electron space charge accumulated in the trap between gun cathode and magnetic mirror. These oscillations often develop after a long-term operation of a gyrotron. Modification of cathode emission characteristics can be one of the most probable causes of this phenomenon. Our paper reports the results of the study of space charge oscillations in gyrotron trap and effect of emission inhomogeneities on their characteristics

Keywords

electron guns; gyrotrons; particle beam stability; space charge; cathode emission characteristics; electron space charge; emission inhomogeneities; gun cathode; gyrotron trap; gyrotron-type electron beams; low-frequency oscillations; magnetic mirror; millimeter wave gyrotrons; quasi-CW regime; space charge oscillations; spurious oscillations; Cathodes; Electromagnetic heating; Electron traps; Gyrotrons; Impedance; Mirrors; Plasma applications; Plasma waves; Space charge; Tokamaks;

fLanguage

English

Publisher

ieee

Conference_Titel

High-Power Particle Beams, 1998. BEAMS '98. Proceedings of the 12th International Conference on

Conference_Location

Haifa

Print_ISBN

0-7803-4287-9

Type

conf

DOI

10.1109/BEAMS.1998.816974

Filename

816974