The fusion Z-pinch experiment device produces a 0.3 cm radius by 50 cm-long Z pinch between the end of the inner electrode of a coaxial plasma gun and an end wall 50 cm away. The plasma column is stabilized for thousands of instability growth times by an embedded radially sheared axial plasma flow. To investigate the effect of end wall design on Z-pinch plasma behavior, the solid end wall with a central exhaust port is replaced with a spoked end wall with a solid hub. While the Z-pinch plasma behavior was largely unaffected, the plasma exhausted from the Z-pinch provides an experimental platform to study magnetic confinement and detachment. Current and density signals are compared between two cases: a low energy and a high energy case. Plasma is found to be frozen-in flux in the Z-pinch assembly region. The exhaust of plasma from the flux conserving region is found to be dependent on the ratio of plasma ram and thermal pressures to the local magnetic pressure, calculated from an equilibrium model at the end wall. Plasma exhaust is observed to increase with the spoked end wall only for the high energy conditions as its ratio of ram and thermal pressures to the magnetic pressure increases.

中文翻译：

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剪切流稳定的 Z 夹点中的等离子排气

融合 Z 形收缩实验装置在同轴等离子枪的内电极末端和 50 厘米外的端壁之间产生 0.3 厘米半径乘 50 厘米长的 Z 形收缩。等离子体柱通过嵌入的径向剪切轴向等离子体流稳定了数千次不稳定增长时间。为了研究端壁设计对 Z-pinch 等离子体行为的影响，带有中央排气口的实心端壁被替换为带有实心轮毂的辐条端壁。虽然 Z-pinch 等离子体行为基本上不受影响，但从 Z-pinch 排出的等离子体为研究磁约束和分离提供了一个实验平台。在两种情况下比较电流和密度信号：低能量和高能量情况。等离子体被发现在 Z 形收缩组装区域中被冻结在通量中。发现从通量守恒区域排出的等离子体取决于等离子体撞击压力和热压力与局部磁压力的比值，该比值由端壁处的平衡模型计算得出。观察到等离子排气随着辐条端壁的增加而增加，仅在高能量条件下，因为其撞击压力和热压力与磁压力的比率增加。