基于回旋流体与回旋动理学集成方法的无碰撞等离子体团不稳定性研究
Investigation of the collisionless plasmoid instability based on gyrofluid and gyrokinetic integrated approach
AI总结：
本文通过对比回旋流体与回旋动理学模拟，研究了强导向场无碰撞等离子体中有限$β_e$对等离子体团不稳定性的影响，发现$β_e$效应促进等离子体团生长，并验证了回旋流体模型的预测能力。
摘要：
本文分析了在具有强导向场的无碰撞等离子体中，二维电流片相对于撕裂模的发展。在非线性演化阶段，这些薄电流片会变得不稳定并形成等离子体团，从而使磁重联过程达到高重联率。我们详细研究了有限$β_e$（同时意味着有限电子拉莫尔半径效应）对无碰撞等离子体团不稳定性的影响。该研究通过对比回旋流体和回旋动理学模拟来进行。对比表明，回旋流体模型在预测回旋动理学模拟中观察到的等离子体团不稳定性方面总体具有良好的能力。我们证明$β_e$的效应会促进等离子体团生长。通过比较能量变化，还研究了在推导回旋流体模型时应用的闭合的影响。
英文摘要：
In this work, the development of two-dimensional current sheets with respect to tearing-modes, in collisionless plasmas with a strong guide field, is analysed. During their non-linear evolution, these thin current sheets can become unstable to the formation of plasmoids, which allows the magnetic reconnection process to reach high reconnection rates. We carry out a detailed study of the impact of a finite $β_e$, which also implies finite electron Larmor radius effects, on the collisionless plasmoid instability. This study is conducted through a comparison of gyrofluid and gyrokinetic simulations. The comparison shows in general a good capability of the gyrofluid models in predicting the plasmoid instability observed with gyrokinetic simulations. We show that the effects of $β_e$ promotes the plasmoid growth. The impact of the closure applied during the derivation of the gyrofluid model is also studied through the comparison of the energy variation.
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