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The evolution of current in a radial, two element, vacuum gap has been studied as a function of applied voltage. Gap spacings of 1 and 2 mm, between coaxial brass electrodes, at a pressure of 1?10-2 Pa, have been used. Voltage pulses between 20 kV and 176 kV, with 15 ns risetimes and 50 ns durations, have been applied to the vacuum gap using a water-filled Blumlein generator having a source impedance...