Accession Number:

AD0605426

Title:

INITIATION OF ELECTRICAL BREAKDOWN IN ULTRAHIGH VACUUM,

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Report Date:

1964-08-01

Pagination or Media Count:

64.0

Abstract:

Existing theories for the initiation of electrical breakdown are reviewed, together with the experimental observations on which they are based. Experiments described have extended the available data on electrical breakdown between broad area electrodes under ultrahigh vacuum conditions. The results are interpreted on the basis of a single picture which explains and relates the phenomena of predischarge currents and the initiation of breakdown. Based on field emission from sharp submicroscopic points, this picture predicts breakdown when the local electric field at the cathode reaches a critical value. The local field, which for broad area electrodes may be much larger than the average field, is deduced from observations of field emission prior to breakdown. When properly analyzed, data for tungsten electrodes from this research and several others indicate a value for the electrical field at breakdown which is independent of gap spacing or geometrical configuration for voltages up to 250 kV. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE