Accession Number : AD0616077

Title :   THE LIFETIME OF POSITIVE STREAMERS IN A PULSED POINT-TO-PLANE GAP IN ATMOSPHERIC AIR,

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : Dawson,G. A.

Report Date : 02 NOV 1964

Pagination or Media Count : 13

Abstract : A determination has been made of the lifetime of positive streamers produced in atmospheric air in a positive point-to-plane gap to which was applied a 40 nsec, 40 kV voltage pulse. The streamer tips have been detected at a given plane in the gap by means of a photomultiplier and high speed oscilloscope. It was found that the streamer tips continued to propagate in the gap, long (up to 35 nsec) after the voltage pulse was removed, in accordance with the predictions of a recently presented model of streamer propagation. Association of this long lifetime with the properties of an isolated tip was made possible by the detection of a new phenomenon at the anode. At the end of the voltage pulse a second luminosity was observed to leave the anode and to extend along the paths of the primary streamers for about one third of their length. This is shown to be the maximum extent of a more highly conducting trunk, behind and separated from the streamer tip, affecting both the propagation of the tip and the eventual transition of a streamer to a breakdown spark. (Author)

Descriptors :   (*ELECTRICAL CORONA, PROPAGATION), ELECTRIC DISCHARGES, SPARKS, AVALANCHE DIODES, GAS DISCHARGES, GLOW DISCHARGES, PHOTOMULTIPLIER TUBES, PHOTOGRAPHIC ANALYSIS, VOLTAGE

Distribution Statement : APPROVED FOR PUBLIC RELEASE