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Study of the fine structure of the plasma current sheath and magnetic fields in the axial region of the PF-1000 facility

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Abstract

Results of measurements of magnetic fields in the plasma pinching region during the compression of the deuterium plasma current sheath (PCS) at the PF-1000 plasma focus facility are presented. The fine structure of the PCS (shock wave-magnetic piston) and its variations in the course of plasma compression toward the facility axis are studied using magnetic probes and laser interferometry. The radial distributions of the plasma density and current in the PCS are compared. It is shown that, in the shock wave region, the electron density of the compressed plasma is on the order of ∼1018 cm−3, whereas the PCS current is almost entirely concentrated in the magnetic piston region—a plasma layer with an electron density of less than 1015 cm−3. Efficient transportation of the current by the PCS into the axial region of the facility in discharges with a high neutron yield (Y n > 1011 neutrons/shot) is detected. It is shown that the total neutron yield is well described by the dependence Y n ≈ (1.5–3) × 1010 I 4 p , where I p is the pinch current (in MA) flowing within the region r ≤ 13 mm.

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Authors and Affiliations

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

    K. N. Mitrofanov

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

    V. I. Krauz

  3. Czech Technical University in Prague, Technicka 2, Prague 6, 16627, Czech Republic

    P. Kubes

  4. Institute of Plasma Physics and Laser Microfusion, Hery 23, Warsaw, 00908, Poland

    M. Scholz, M. Paduch & E. Zielinska

Authors
  1. K. N. Mitrofanov
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  2. V. I. Krauz
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  3. P. Kubes
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  4. M. Scholz
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  5. M. Paduch
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  6. E. Zielinska
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Correspondence to K. N. Mitrofanov.

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Original Russian Text © K.N. Mitrofanov, V.I. Krauz, P. Kubes, M. Scholz, M. Paduch, E. Zielinska, 2014, published in Fizika Plazmy, 2014, Vol. 40, No. 8, pp. 721–737.

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Mitrofanov, K.N., Krauz, V.I., Kubes, P. et al. Study of the fine structure of the plasma current sheath and magnetic fields in the axial region of the PF-1000 facility. Plasma Phys. Rep. 40, 623–639 (2014). https://doi.org/10.1134/S1063780X14070071

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  • DOI: https://doi.org/10.1134/S1063780X14070071

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