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Equilibrium, flow shear and stability measurements in the Z-pinch

机译:Z型捏合中的平衡,流量剪切和稳定性测量

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The stabilizing effect of a sheared axial flow is investigated in the ZaP flow Z-pinch experiment at the University of Washington. Long-lived, hydrogen Z-pinch plasmas are generated that are 1 m long with an approximately 10 mm radius and exhibit gross stability for many Alfven transit times. Large magnetic fluctuations occur during pinch assembly, after which the amplitude and frequency of the fluctuations diminish. This stable behaviour continues for an extended quiescent period. At the end of the quiescent period, fluctuation levels increase in magnitude and frequency. Axial flow profiles are determined by measuring the Doppler shift of plasma impurity lines using a 20-chord spectrometer. Experimental measurements show a sheared flow that is coincident with low magnetic fluctuations during the quiescent period. The experimental flow shear exceeds the theoretical threshold during the quiescent period, and the flow shear is lower than the theoretical threshold at other times. The observed plasma behaviour and correlation between the sheared flow and stability persists as the amount of injected neutral gas and experimental geometry are varied. Computer simulations using experimentally observed plasma profiles show a consistent sheared flow stabilization effect. Plasma pinch parameters are measured independently to demonstrate an equilibrium consistent with radial force balance.
机译:在华盛顿大学的ZaP流动Z捏实验中研究了轴向剪切流的稳定作用。产生长寿命的氢Z夹等离子,长1 m,半径约10 mm,并在许多Alfven传输时间表现出总体稳定性。捏合过程中会出现较大的磁波动,此后波动幅度和频率都会减小。这种稳定的行为会持续较长的静态时间。在静止期结束时,波动水平的幅度和频率都会增加。通过使用20弦光谱仪测量血浆杂质线的多普勒频移来确定轴流曲线。实验测量表明,在静态期间,剪切流与低电磁波动相吻合。静态期间,实验流量切变超过理论阈值,其他时候流量切变低于理论阈值。随着注入的中性气体量和实验几何形状的变化,观察到的等离子体行为以及剪切流与稳定性之间的相关性持续存在。使用实验观察到的等离子体轮廓的计算机模拟显示了一致的剪切流稳定效果。单独测量血浆收缩参数,以证明与径向力平衡相符的平衡。

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