Magnetic probe measurements of the current sheath on the PF-3 facility |
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Authors: | V I Krauz K N Mitrofanov V V Myalton V P Vinogradov Yu V Vinogradova E V Grabovski G G Zukakishvili V S Koidan A N Mokeev |
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Institution: | 1.Russian Research Centre Kurchatov Institute,Moscow,Russia;2.Troitsk Institute for Innovation and Fusion Research,Troitsk, Moscow oblast,Russia |
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Abstract: | Results are presented from experimental studies of the dynamics of the current sheath (CS) on the PF-3 plasma focus facility.
The parameters of the sheath, including the current distribution in it, were measured using absolutely calibrated magnetic
probes installed at different positions with respect to the facility axis and the anode surface. The CS dynamics in discharges
operating in argon and neon was investigated, and the skin depth in different stages of the discharge was determined. One
of the probes was installed at a distance of ≈2 cm from the facility axis, which made it possible to estimate the efficiency
of current transfer to the region of pinch formation. Operating modes were obtained in which the current dynamics detected
by magnetic probes at different distances from the axis agreed well with the dynamics of the total discharge current until
the instant of singularity in the current time derivative. It is shown that shunting breakdowns can lead to the formation
of closed current loops. The shunting of the discharge current by the residual plasma is directly related to the efficiency
of snowplowing of the working gas by the CS as it propagates from the insulator toward the facility axis. |
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