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Magnetic probe measurements of the current sheath on the PF-3 facility

  • Plasma Dynamics
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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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Authors and Affiliations

  1. Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia

    V. I. Krauz, V. V. Myalton, V. P. Vinogradov, Yu. V. Vinogradova, V. S. Koidan & A. N. Mokeev

  2. Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow oblast, 142190, Russia

    K. N. Mitrofanov, E. V. Grabovski & G. G. Zukakishvili

Authors
  1. V. I. Krauz
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  2. K. N. Mitrofanov
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  3. V. V. Myalton
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  4. V. P. Vinogradov
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  5. Yu. V. Vinogradova
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  6. E. V. Grabovski
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  7. G. G. Zukakishvili
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  8. V. S. Koidan
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  9. A. N. Mokeev
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Additional information

Original Russian Text © 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, 2010, published in Fizika Plazmy, 2010, Vol. 36, No. 11, pp. 997–1012.

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Krauz, V.I., Mitrofanov, K.N., Myalton, V.V. et al. Magnetic probe measurements of the current sheath on the PF-3 facility. Plasma Phys. Rep. 36, 937–952 (2010). https://doi.org/10.1134/S1063780X10110036

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