Modification of the cathode material around the explosive electron emission centers in the spark stage of vacuum breakdown
Nefedtsev E. V. 1, Onischenko S. A.1
1Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
Email: nev@lve.hcei.tsc.ru, osa@lve.hcei.tsc.ru

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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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