Effect of the Plasma-Jet in a Double Electrode Spark Gap

概要

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The mechanism of trigger action in a double electrode spark gap was investigated, clarifying the role of a plasma-jet ejected from the nozzle of the double electrode. Time lag characteristics were measured under several different voltages. Form and growth of a plasma-jet were observed with a suitable arrangement of a lens and a photo cell. The results show that the trigger mechanism may be assumed as follows: (1) A plasma-jet, ejected with a trigger spark, behaves itself like a protruding conductive stick. (2) Electric field strength in the gap is increased with growth of the jet. (3) A main spark is initiated in the space between the jet-front and the anti-electrode. (4) The critical distance between the jet-front and the anti-electrode is dependent on the voltage applied to the anti-electrode, and independent of gap length. Ions transported by the plasma-jet help to initiate the main spark. From these assumptions, sparking voltage and time lag characteristics, fluctuation of time lags, and effect of various factors, are explained.
社団法人日本物理学会の論文
1964-03-05