Accession Number:

AD0750478

Title:

Low-Frequency Flute Instabilities of a Hollow Cathode Arc Discharge: Theory and Experiment,

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF INST FOR PLASMA RESEARCH

Report Date:

1972-07-01

Pagination or Media Count:

49.0

Abstract:

The characteristics of two low-frequency electrostatic flute instabilities of a low-pressure hollow cathode arc discharge are reported. Mode 1 has azimuthal mode number m1, and occurs when the radial electric field is negative directed inwards while Mode 2 has m-1 and occurs when the field is positive. The radial electric field is controlled by varying the potential of a secondary anode cylinder located close to the outer discharge radius. A linear perturbation analysis, based on the two-fluid equations, is given for a low-beta, collisionless cylindrical plasma column, immersed in a uniform axial magnetic field, having a Gaussian density profile and an arbitrary radial electric field profile. Reasonable correlation between theory and experiment is demonstrated for both modes, by comparing the calculated and measured frequencies, mode numbers, and also the eigenfunctions of the density and potential fluctuations. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE