Sites of Initiation of Explosive-Emission Processes on the Surface of Single-Crystal and Coarse-Grained Polycrystalline Copper

Nefedtsev, E. V.; Onischenko, S. A.; Batrakov, A. V.

doi:10.1007/s11182-019-01827-4

Cited by 3 publications

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“…In the work [4] have examined cathode crater erosion of single-crystalline copper after vacuum-gap breakdown (anode was made of tungsten and tantalum) by a triangular 200 kV voltage pulse with a rise time of 20 ns and a fall time of 10 ns. With this short-pulse breakdown interrupted at the start of the spark stage, several compact clusters of craters with a size on the order of several micrometers and several individual craters several tenths of a micrometer in size formed on the single-crystalline copper cathode surface.…”

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Modification of the cathode material around the explosive electron emission centers in the spark stage of vacuum breakdown

Nefedtsev

Onischenko

2022

Technical Physics Letters

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On the basis of numerical calculations estimates for the fields of mechanical stresses around the explosive electron emission centers of the cathode during the development of pulsed vacuum breakdown are given. Expansion of material due to conduction loss was taken into account. It is shown that the sizes of regions with broken crystalline structure is much larger than the corresponding of explosive emission centers. Keywords: vacuum breakdown, explosive electron emission, mechanical stresses.

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confidence: 99%