Dynamics of the structure of the plasma current sheath in a plasma focus discharge |
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Authors: | V I Krauz K N Mitrofanov V V Myalton V P Vinogradov Yu V Vinogradova E V Grabovski V S Koidan |
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Institution: | 1.National Research Centre Kurchatov Institute,Moscow,Russia;2.Troitsk Institute for Innovation and Fusion Research,Troitsk, Moscow oblast,Russia |
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Abstract: | The study is aimed at investigating the fine structure of the plasma current sheath (PCS) in the PF-3 plasma focus facility.
The PCS dynamics in a deuterium discharge was studied. The PCS parameters were measured using absolutely calibrated magnetic
probes installed at different positions with respect to the facility axis and the anode surface. A magneto-optical probe recording
both the magnetic signal and the PCS optical luminosity was first applied to analyze the PCS structure. This made it possible
to spatially resolve the current and shock-wave regions. It is demonstrated that the current distribution is different in
different discharge stages. It is shown that the neutron yield is determined by the value of the current compressed toward
the axis, rather then the amplitude of the total discharge current. |
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