Measurement of Magnetic Cavitation Driven by Heat Flow in a Plasma
Measurement of Magnetic Cavitation Driven by Heat Flow in a Plasma
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等离子体中热流驱动的磁空化的测量
DOI：
10.1103/physrevlett.131.015101
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发表时间：
2023
影响因子：
8.6
通讯作者：
Arran C
中科院分区：
文献类型：
--
作者：
Arran C
我们描述了热流驱动的等离子体中磁场排出的直接测量。我们使用激光在施加的磁场中加热气体柱，分离出能斯特平流，并展示它如何在纳秒时间尺度内改变磁场。从质子射线照片重建磁场图表明，在等离子体以一定速度膨胀之前，磁场是由热流平流传播的。由于磁传输势垒的形成，动力学和扩展的磁流体动力学模拟在这种情况下非常吻合。
We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.