论文标题
响应于tokamak中的谐振磁扰动的血浆流动演变
Plasma flow evolution in response to resonant magnetic perturbation in a tokamak
论文作者
论文摘要
已知外部应用的非轴对称磁场，例如误差场和谐振磁扰动（RMP），会影响血浆动量传输和通过血浆中的血浆反应在tokamak中影响，而血浆反应本身的进化也很大程度上取决于血浆流。两者之间的非线性相互作用已在常规误差场理论中捕获，并具有``无滑动''条件，该条件最近已扩展以允许``自由滑行''条件。为了与仿真进行比较，我们使用初始值代码nimrod中的完全电阻性MHD模型求解了由Tokamak中的单疗法RMP驱动的非线性等离子体响应和流动进化。平行（到$ {\ Mathbf K} $）流量或``滑移频率''曲线及其从nimrod模拟获得的渐近稳态状态的时间演变与常规和扩展的非线性响应理论进行了比较。这里$ {\ mathbf k} $是传播岛的波动矢量。在所有抵抗性方面，与RMP的平行流量进化相对于``自由滑移''条件的扩展理论的良好一致，而随着``not-Splip''条件的差异往往会减小，因为``'no-Splip''条件往往会减小，而随着等值的电阻率接近零。
Externally applied non-axisymmetric magnetic fields such as error field and resonant magnetic perturbation (RMP) are known to influence the plasma momentum transport and flow evolution through plasma response in a tokamak, whereas the evolution of plasma response itself strongly depends on the plasma flow as well. The nonlinear interaction between the two have been captured in the conventional error field theory with a ``no-slip'' condition, which has been recently extended to allow the ``free-slip'' condition. For comparison with simulations, we solve for the nonlinear plasma response and flow evolution driven by a single-helicity RMP in a tokamak, using the full resistive MHD model in the initial-value code NIMROD. Time evolution of the parallel (to ${\mathbf k}$) flow or ``slip frequency'' profile and its asymptotic steady state obtained from the NIMROD simulations are compared with both conventional and extended nonlinear response theories. Here ${\mathbf k}$ is the wave vector of the propagating island. Good agreement with the extended theory with ``free-slip'' condition has been achieved for the parallel flow profile evolution in response to RMP in all resistive regimes, whereas the difference from the conventional theory with the ``no-slip'' condition tends to diminish as the plasma resistivity approaches zero.
