Pressure profiles, resonant Pfirsch–Schlüter currents, thermal instabilities, and magnetic island formation
Pressure profiles, resonant Pfirsch–Schlüter currents, thermal instabilities, and magnetic island formation
复制标题
压力分布、共振 Pfirsch-Schlüter 电流、热不稳定性和磁岛形成
DOI：
10.1063/1.860314
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
J. Callen
中科院分区：
文献类型：
--
作者：
C. Hegna;J. Callen
通过求解平衡磁岛附近的源压力扩散方程，导出了构造平衡磁岛附近等离子体压力分布的公式。对于在空间中相对恒定的压力源和压力汇，发现等离子体压力分布对压力源不敏感;因此，可以通过假设任何拓扑环形磁表面的净压力通量是恒定的来构造压力分布。压力分布的这种构造对于随时间缓慢演变的磁岛也是有效的。通过将压力演化方程与静磁平衡方程耦合，将该理论应用于压力梯度驱动磁岛的自洽构造。特别是，共振Pfirsch-Schluter电流感应磁岛和非线性磁岛的热效应的作用的问题得到解决。
A prescription for constructing the plasma pressure profile in the vicinity of an equilibrium magnetic island is derived by solving a sourced pressure diffusion equation near the island region. For pressure sources and sinks that are relatively constant in space, it is found that the plasma pressure profile is insensitive to pressure sources; thus the pressure profile can be constructed by assuming that the net pressure flux across any topologically toroidal magnetic surface is constant. This construction of the pressure profile is also valid for magnetic islands that are slowly evolving in time. By coupling the pressure evolution equation with the magnetostatic equilibrium equations, the theory is applied to the case of self‐consistent construction of pressure‐gradient‐driven magnetic islands. In particular, the question of resonant Pfirsch–Schluter current induced magnetic islands and the role of thermal effects on nonlinear magnetic islands is addressed.