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Investigation of anode and cathode jets influence on electric arc properties with current up to 500 kA

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6 Author(s)
Rutberg, P.G. ; Inst. of Problems of Electrophys., Russian Acad. of Sci., St. Petersburg, Russia ; Bogomaz, A.A. ; Budin, A.V. ; Kolikov, V.A.
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A number of phenomena connected with the formation of electrode jets in discharges in hydrogen at a current of 105-106 A, a current growth rate of 1010 A/s, an initial pressure 0.1-4.0 MPa, and a discharge gap length of 5-40 mm were studied. After the secondary breakdown, the jets are observed through a discharge semitransparent channel, widening with velocity (4-7) · 102 m/s. Shockwave formation was detected at the interaction of jets with the surrounding gas and the opposite electrode. Plasma vapor pressure of metal near the end of the tungsten cathode 70 μs after initiation of a discharge was 180 MPa. Thus, magnitude of brightness temperature was 59 · 103 K, with an average charge of ions-m~=3.1, and a concentration of metal vapors n=5.3·1019 cm-3. While those at the end of the anode 90 μs after initiation of discharge: m~=2.6, n=7.4·1019 cm-3. Probable reasons of high-voltage drops near the electrodes (the summarized magnitude of which is ∼1 kV) are discussed on the basis of experimental data. For the first time, the shadow method registered symmetric ejection of material from the all-cathode surface the maximum discharge current was observed.

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Plasma Science, IEEE Transactions on  (Volume:31 ,  Issue: 2 )