A vacuum arc is a gas discharge that maintains itself by providing the conductive medium between cathode and anode through evaporation of material from either one of the electrodes. The rather rapid material evaporation process occurs in microscopic spots on the electrode surface. The spot's existence is highly dynamic and determined by the interaction between the surface near solid-state region of the electrode and the generated plasma in front of it. The material leaves the electrode region fully ionized an…
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