表征磁化弱碰撞等离子体中热传导的实验设计
Design of experiments characterising heat conduction in magnetised, weakly collisional plasma
AI总结：
本文提出了一种实验平台，用于研究弱碰撞高η等离子体中的哨声热流不稳定性，通过模拟验证其在热导率测量中的有效性。
摘要：
在弱碰撞、磁化等离子体中，由于电子传热过程中涉及的多方面物理机制，如散射电子的微不稳定性，准确建模热传导极具挑战性。捕捉这些效应需要多维动能理论模拟，但计算成本较高。实验约束克服了这一问题，提高了对如星系团内部介质和惯性约束聚变中的热点等系统的热输运理解。本文介绍了一种新的实验平台，产生预期易受哨声热流不稳定性影响的弱碰撞高η等离子体。该平台将部署在Orion激光器上，用于表征哨声调节的热导率。平台设计通过辐射磁流体动力学模拟代码FLASH进行评估。使用三种热传导模型的模拟预测，在哨声饱和时热导率相对于Spitzer值抑制了一个数量级，证明了该平台的有效性。
英文摘要：
Heat conduction in weakly collisional, magnetised plasma is challenging to model accurately due to multifaceted physics governing heat-carrying electrons, including microinstabilities that scatter electrons and modify heat transport. Capturing these effects requires multidimensional kinetic theory simulations, which are computationally expensive. Experimental constraints overcome this issue, resulting in improved understanding of thermal transport in systems such as the intra-cluster medium of galaxy clusters, and the hot-spot in inertial confinement fusion. In this paper, we present a new experimental platform that produces a weakly collisional high-\b{eta} plasma expected to be susceptible to the whistler heat-flux instability. This platform, to be fielded on the Orion laser, enables characterisation of whistler-regulated thermal conductivity. The platform design is assessed using radiation-magnetohydrodynamics simulations with the code FLASH. Simulations using three thermal conduction models predict conductivity suppression by over an order of magnitude relative to the Spitzer value at whistler saturation, demonstrating the efficacy of the platform.
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