Effects of centrifugal modification of magnetohydrodynamic equilibrium on resistive wall mode stability
Effects of centrifugal modification of magnetohydrodynamic equilibrium on resistive wall mode stability
复制标题
磁流体动力学平衡的离心修正对电阻壁模式稳定性的影响
DOI：
10.1088/0029-5515/54/8/083008
复制
发表时间：
2014
期刊：
影响因子：
3.3
通讯作者：
and M. Yagi
中科院分区：
文献类型：
--
作者：
J. Shiraishi;N. Aiba;N. Miyato;and M. Yagi
在线性磁流体动力学（MHD）稳定性分析和平衡计算中，自洽地考虑了环向旋转效应。磁流体力学平衡计算受环向旋转产生的离心力的影响。为了研究环向旋转对阻性壁模的影响，开发了一个新的程序。RWMaC模块解决了真空和电阻壁中的电磁动力学问题，已在MINERVA代码中实现，该代码解决了描述旋转等离子体中线性理想MHD动力学的Frieman-Rotenberg方程。结果表明，离心力对MHD平衡的修正使快速旋转RWM的增长率降低到M2 = 0.1的量级，其中M为马赫数。此外，它可以打开一个稳定的窗口，不存在的假设下，旋转只影响线性动力学。旋转改变了平衡压力梯度和电流密度分布，从而导致包括旋转效应在内的势能变化。
Toroidal rotation effects are self-consistently taken into account not only in the linear magnetohydrodynamic (MHD) stability analysis but also in the equilibrium calculation. The MHD equilibrium computation is affected by centrifugal force due to the toroidal rotation. To study the toroidal rotation effects on resistive wall modes (RWMs), a new code has been developed. The RWMaC modules, which solve the electromagnetic dynamics in vacuum and the resistive wall, have been implemented in the MINERVA code, which solves the Frieman–Rotenberg equation that describes the linear ideal MHD dynamics in a rotating plasma. It is shown that modification of MHD equilibrium by the centrifugal force significantly reduces growth rates of RWMs with fast rotation in the order of M 2= 0.1 where M is the Mach number. Moreover, it can open a stable window which does not exist under the assumption that the rotation affects only the linear dynamics. The rotation modifies the equilibrium pressure gradient and current density profiles, which results in the change of potential energy including rotational effects.