Manuel M J-E, Sefkow A B, Kuranz C C, Rasmus A M, Klein S R, MacDonald M J, Trantham M R, Fein J R, Belancourt P X, Young R P, Keiter P A, Pollock B B, Park J, Hazi A U, Williams G J, Chen H, Drake R P
General Atomics, Inertial Fusion Technologies, San Diego, California 92121, USA.
Department of Mechanical Engineering, University of Rochester, Rochester, NY 14623, USA.
Phys Rev Lett. 2019 Jun 7;122(22):225001. doi: 10.1103/PhysRevLett.122.225001.
The creation and disruption of inertially collimated plasma flows are investigated through experiment, simulation, and analytical modeling. Supersonic plasma jets are generated by laser-irradiated plastic cones and characterized by optical interferometry measurements. Targets are magnetized with a tunable B field with strengths of up to 5 T directed along the axis of jet propagation. These experiments demonstrate a hitherto unobserved phenomenon in the laboratory, the magnetic disruption of inertially confined plasma jets. This occurs due to flux compression on axis during jet formation and can be described using a Lagrangian-cylinder model of plasma evolution implementing finite resistivity. The basic physical mechanisms driving the dynamics of these systems are described by this model and then compared with two-dimensional radiation-magnetohydrodynamic simulations. Experimental, computational, and analytical results discussed herein suggest that contemporary models underestimate the electrical conductivity necessary to drive the amount of flux compression needed to explain observations of jet disruption.
通过实验、模拟和分析建模，对惯性准直等离子体流的产生和破坏进行了研究。超音速等离子体射流由激光辐照的塑料锥产生，并通过光学干涉测量进行表征。用可调谐的B场对靶进行磁化，B场强度高达5 T，沿射流传播轴方向。这些实验证明了实验室中迄今为止未观察到的一种现象，即惯性约束等离子体射流的磁破坏。这是由于射流形成过程中轴上的通量压缩所致，并且可以使用考虑有限电阻率的等离子体演化拉格朗日圆柱模型来描述。该模型描述了驱动这些系统动力学的基本物理机制，然后与二维辐射磁流体动力学模拟进行了比较。本文讨论的实验、计算和分析结果表明，当代模型低估了驱动解释射流破坏观测所需通量压缩量所需的电导率。
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