Abstract
The present investigation concerns prebreakdownn conduction in vacuum gaps under slow impulses. Hemispherical, cal, plane, and needle electrodes have been used in a vacuum emvironment of better than 0.1 mPa. The gap spacings were 0.5, 1, and 1.5 mm. The front times ranged from 200 μs to 5 ms. The results indicate that prebreakdown currents were smaller than the highest sensitivity of 10-7 Afor front times of about 1 ins. For larger front times, breakdown currents were-served, which increased with front time. The voltagecurrent urrent relationship appears to follow Fowler-Nordheim theory but Fowler-Nordheim plots are branched. The high magnitudes may be attributed to ion-assisted field emission based on which a model has been developed, that agrees substantially with experimental results. Applicability of non-metallictype of emission iss discussed.
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