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15 Prebreakdown currents in vacuum
17 On field emission sites produced by contact welding
1 other sections not shown
amplitude anode spot formation Appl arc channels arc current arc mode arc velocity arc voltage atoms breakdown voltage carbon cathode drop cathode spot cathode surface characteristic constriction contact distance copper current density curves decrease dependence diffuse arc Discharges and Electrical effect elec electric field Electrical Insulation electrodes electron emission emitted emitter energy equation erosion evaporation expansion experimental explosive field emission flow frequency function heating high current IEEE IEEE Trans impulse voltage increase initiation Insulation in Vacuum intensity investigations ion current ionization Joule heat layer magnetic field maximum measured melting metal microspot niobium observed obtained occurs parameters particles photon Phys plane plasma prebreakdown current probe Proc pulse radius region rent retrograde motion shown Symposium on Discharges temperature thermal tion tokamak Torr transition vacuum arc vacuum gap vacuum tube values vapour Xlth International Symposium