实验室中幕式磁驱动辐射冷却等离子体射流的形成
Formation of Episodic Magnetically Driven Radiatively Cooled Plasma Jets in the Laboratory
摘要：
我们报告的实验中，磁驱动的辐射冷却等离子体射流产生的1 MA，250纳秒的电流脉冲的MAGPIE脉冲功率设施。这些射流是由环形磁场的压力驱动的，呈“磁塔”状。这种情况的特点是形成一个磁准直等离子体射流的轴上的磁“气泡”，由周围介质的限制。使用的径向金属箔，而不是在我们以前的工作中采用的径向线阵列允许产生的情节磁塔流出，出现周期性的时间尺度为~30 ns。随后的磁泡以约300 km/s的速度传播，并与先前的喷发相互作用，导致形成冲击。
英文摘要：
We report on experiments in which magnetically driven radiatively cooled plasma jets were produced by a 1 MA, 250 ns current pulse on the MAGPIE pulsed power facility. The jets were driven by the pressure of a toroidal magnetic field in a ''magnetic tower'' jet configuration. This scenario is characterized by the formation of a magnetically collimated plasma jet on the axis of a magnetic ''bubble'', confined by the ambient medium. The use of a radial metallic foil instead of the radial wire arrays employed in our previous work allows for the generation of episodic magnetic tower outflows which emerge periodically on timescales of ~30 ns. The subsequent magnetic bubbles propagate with velocities reaching ~300 km/s and interact with previous eruptions leading to the formation of shocks.
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