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Correlation of magnetic probe and neutron signals with interferometry figures on the plasma focus discharge

P Kubes, V Krauz, K Mitrofanov, M Paduch, M Scholz, T Piszarzcyk, T Chodukowski, Z Kalinowska, L Karpinski, D Klir2012年Plasma Physics and Controlled FusionIF 2.2出版社

In this paper the results of temporally resolved measurements using calibrated azimuthal and axial magnetic probes are presented, together with interferometry and neutron diagnostics performed on the PF-1000 (IPPLM, Warsaw, 2 MA) device with a deuterium filling and 1011 neutron yield. The probes located in the anode front at three different radial positions allow determination of the dominant part of the discharge current flows behind the imploding dense plasma layer. The current sheath is composed of both the axial and azimuthal components of the magnetic field. After reaching the minimum diameter, the current sheath continues in a radial motion to the axis and then penetrates into the dense plasma column. At the final phase of stagnation, the dominant current passes through the dense column. The probes located on the axis of the anode front registered an increase and a decrease in the pulse of the axial component of the magnetic field in correlation with the formation and decay of the dense plasmoidal structure. The estimated values of the axial component of the magnetic field at the center of the plasmoids in the first neutron pulse and close before its decay and dominant neutron production can reach 2 and 10 T; it is 10–30% of the value of the azimuthal magnetic field of the dense column boundary.

日本語訳

本論文では、較正された方位角方向および軸方向の磁気プローブを用いた時間分解測定の結果を、干渉計測および中性子診断とともに提示する。これらの測定は、重水素充填および10¹¹の中性子収量を有するPF-1000(IPPLM、ワルシャワ、2 MA)装置において実施された。陽極前面の3つの異なる半径位置に配置されたプローブにより、放電電流の主要部分が高密度プラズマ層の背後を流れることが決定された。電流シースは、磁場の方位角成分と軸方向成分の両方で構成される。最小半径に到達した後、電流シースは軸方向への運動を継続し、その後高密度プラズマ柱内へ侵入する。 stagnationの最終段階では、主要電流は高密度プラズマ柱を通過する。陽極前面の軸上に配置されたプローブは、高密度プラズモイド構造の形成と崩壊に相関して、磁場の軸方向成分のパルスの増加と減少を記録した。最初の中性子パルス中のプラズモイド中心における磁場の軸方向成分の推定値は、その崩壊前に2 Tおよび10 Tに達し得る。これは、高密度プラズマ柱境界における方位角磁場の値の10〜30%に相当する。

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