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Hysteresis during transition into improved mode on biasing experiment under the electrode current control in Tohoku University Heliac

机译：东北大学Heliac电极电流控制下的偏置实验过渡到改进模式时的磁滞

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摘要

Electrode bias experiments were carried out in Tohoku University Heliac (TU-Heliac). This paper presents a comparison of the plasma behaviour in discharge of the electrode current ramped up with that ramped down to investigate the bifurcation and hysteresis phenomena. Bifurcation of the electrode current against the bias voltage, i.e. negative resistance and hysteresis between (1) electron stored energy and input power from the electrode, (2) fluctuation level of ion saturation current and radial electric field and (3) poloidal momentum damping force and poloidal Mach number were observed. The driving force in the region where the hysteresis was observed corresponded to those in the negative resistance phase and those were located at local maximum of the ion viscosity. Hysteresis between the poloidal Mach number and the poloidal damping force was observed. However, the difference in ion viscosity, which was obtained by subtracting the friction term from the total poloidal damping force, between the electrode current ramped up/down in the transition region was rather small. The data in the negative resistance region corresponded to those in the regime where the viscosity decreased against the poloidal Mach number.
机译：电极偏压实验是在东北大学日立化学研究所（TU-Heliac）中进行的。本文介绍了在放电电流上升和下降的过程中对等离子体行为的比较，以研究分叉和滞后现象。电极电流相对于偏压的分叉，即（1）电子存储的能量和来自电极的输入功率之间的负电阻和磁滞，（2）离子饱和电流和径向电场的波动水平，以及（3）极化动量阻尼力并观察到极性马赫数。观察到磁滞的区域中的驱动力对应于负电阻相中的驱动力，并且位于离子粘度的局部最大值处。观察到倍数马赫数和倍数阻尼力之间的磁滞。但是，在过渡区域中，使电流上升/下降的电极电流之间的离子粘度的差很小，这是通过从总的极点阻尼力减去摩擦项而得到的。负电阻区域中的数据对应于粘度相对于多倍马赫数降低的状态中的数据。

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