Accession Number : AD0783903

Title :   Pulsed Vacuum Arcs.

Descriptive Note : Final rept. Jun 72-Jun 73,


Personal Author(s) : Lockwood,David L.

Report Date : JUN 1974

Pagination or Media Count : 153

Abstract : Pulsed vacuum arcs are examined from the view of device engineering. Cathode spot behavior which is well documented in the literature is discussed with particular attention to emission rates and stability. The metallic plasma characteristics are found to be such that the current is drift dominated over most of the arc. This leads to a particularly simple relationship between the arc current and externally applied magnetic fields. Using this theory, which is referred to in the literature as magneto-ionic theory, circuits involving the vacuum arc are analyzed. Agreement with experimental data is found to be good, with the major discrepancies occurring at high magnetic fields. A high voltage pulsed vacuum arc switch was developed which was operated at voltages up to 25 kV and currents of 800 A. The current rise time for this switch was compared with a theoretical expression based on a fixed arc spot division time, and the results were found to be in good agreement. Other applications of the pulsed vacuum arc are also discussed. These are electric propulsion, metal spraying, and vacuum pumping. (Author)

Descriptors :   *Vacuum switches, Electric arcs, Plasmas(Physics), Pulses, Plasma generators

Subject Categories : Electrical and Electronic Equipment
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE