Initial stage of discharge current growth in a triggered vacuum gap |
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Authors: | Vozdvijensky V.A. Sidorov V.A. |
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Affiliation: | All-Union Electrotech. Inst., Moscow; |
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Abstract: | The dynamics of light emission accompanying the initial stage of electric discharge in a substantially undervoltaged vacuum gap was studied with a knock-down model using high-speed photorecording. Voltage across the gap was maintained within the range of 0.5-5 kV, which corresponded to the minimum operating voltage of vacuum-triggered gaps. It was found that front layers of a plasma cloud near a cathode, formed by a firing pulse, scattered at a speed of (5-8)×106 cm/s. During firing, a channel directed to the opposite electrode was formed from the plasma cloud near the cathode. It was found that the average switch-on delay time of the triggered vacuum gap is ~d(1+h/d) If-α, where d is the interelectrode gap length, h is the trigger assembly penetration height, and If is the firing current |
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