Destabilization mechanism of the collisional microtearing mode in magnetized slab plasmas
Destabilization mechanism of the collisional microtearing mode in magnetized slab plasmas
复制标题
磁化平板等离子体碰撞微撕裂模式的失稳机制
DOI：
10.1088/1361-6587/accbeb
复制
发表时间：
2023
影响因子：
2.2
通讯作者：
Numata Ryusuke
中科院分区：
文献类型：
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作者：
Yagyu Mitsuyoshi;Numata Ryusuke
利用理论分析和包括全面碰撞模型在内的回旋动力学模拟研究了磁化板状等离子体中电子温度梯度驱动的碰撞微撕裂模的失稳机制。微撕裂模失稳的本质机制是平行感应电场滞后于磁场，这是由于速度相关的电子-离子碰撞产生的时间相关的热力和惯性力。碰撞效应的定量测量使我们能够识别不稳定的制度对碰撞性，并揭示与现有的环形实验的碰撞微撕裂模式的相关性。非线性模拟表明，微撕裂模并不驱动磁重联，而是伴随着磁能的爆炸释放和转换。
The destabilization mechanism of the collisional microtearing mode driven by an electron temperature gradient is studied using theoretical analyses and gyrokinetic simulations including a comprehensive collision model, in magnetized slab plasmas. The essential destabilization mechanism of the microtearing mode is the lag of the parallel inductive electric field behind the magnetic field owing to the time-dependent thermal force and inertia force induced by the velocity-dependent electron–ion collisions. Quantitative measurements of the collision effects enable us to identify the unstable regime against collisionality and reveal the relevance of the collisional microtearing mode with existing toroidal experiments. A nonlinear simulation demonstrates that the microtearing mode does not drive magnetic reconnection with the explosive release and conversion of the magnetic energy.