Three-dimensional reconnection and relaxation of merging spheromak plasmas
Three-dimensional reconnection and relaxation of merging spheromak plasmas
复制标题
合并 spheromak 等离子体的三维重联和弛豫
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Cothran
中科院分区：
文献类型：
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作者：
T. Gray;V. Lukin;Michael R. Brown;C. Cothran
对高导电圆柱边界内的等离子体弛豫过程进行了实验和计算研究。动力学是通过在圆柱体的两端引入两个相等的螺旋度球标来启动的。在实验中，致密的，高磁通球马克注入到磁通量保存体积与磁化等离子体枪。在模拟中，相同的spheromak最初占据两个半的圆柱体和扰动的介绍。合并开始于一个单一的三维零点，径向移动的通量守恒体积的速度高达0.2的重联流出速度。弛豫到最低能量状态发生在大约十个阿尔芬时间。一个重要的结论是，即使动力学活动仅限于少数几个模式，这种活动足以促进弛豫到最终的最低能量状态。动力学活动似乎保存磁螺旋度，而磁能被转换为流动和热量。动态到达的最终状态与C描述的状态相同。D. Cothran等人[Phys. Rev. Lett. 103，215002（2009）]使用静态特征值分析。
Plasma relaxation inside a highly conducting cylindrical boundary is studied both experimentally and computationally. Dynamics are initiated by the introduction of two equal helicity spheromaks at either end of the cylinder. In the experiment, dense, high-magnetic-flux spheromaks are injected into the flux conserving volume with magnetized plasma guns. In the simulation, identical spheromaks initially occupy both halves of the cylinder and a perturbation is introduced. Merging commences with a single three-dimensional null-point that moves radially out of the flux conserving volume at velocities up to 0.2 of the reconnection outflow velocity. Relaxation to the minimum energy state occurs in about ten Alfven times. An important conclusion is that even though the dynamical activity is limited to a few modes, this activity is sufficient to promote relaxation to the final, minimum energy state. The dynamical activity appears to conserve magnetic helicity while magnetic energy is converted to flow and heat. The final state arrived at dynamically is identical to that described by C. D. Cothran et al. [Phys. Rev. Lett. 103, 215002 (2009)] using static, eigenvalue analysis.