Abstract
A laser-triggering method was applied to a vacuum arc ion source to improve triggering reliability. A frequency-doubled Nd-YAG laser was focused onto the arc cathode at a laser power density of (4.5–6.1)×108 W/cm2. Time-resolved observations revealed that a cathode spot was initially formed within the laser focusing area and the distribution of the cathode spots expanded circularly with time because of the retrograde motion of each cathode spot. The mean square displacement of the retrograde cathode spot was found to be proportional to the discharge time. Moreover, arc ignition probability with the laser trigger was measured under various conditions. It was found that the ignition probability strongly depends on the laser intensity and the gap spacing. This paper discusses the starting process of the laser-triggered vacuum arc discharge on the basis of the experimental results.
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