Impact of rotation and ion diamagnetic drift on MHD stability at edge pedestal in quiescent H-mode plasmas
Impact of rotation and ion diamagnetic drift on MHD stability at edge pedestal in quiescent H-mode plasmas
复制标题
旋转和离子抗磁漂移对静态 H 模式等离子体边缘基座 MHD 稳定性的影响
DOI：
10.1088/1741-4326/ab8c66
复制
发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Snyder P.B.
中科院分区：
文献类型：
--
作者：
Aiba N.;Chen X.;Osborne T.H.;Honda M.;Burrell K.H.;Snyder P.B.
通过考虑等离子体旋转和离子抗磁漂移效应，分析了 DIII-D 中 QH 模式等离子体边缘基座的 MHD 稳定性。我们发现耦合旋转和离子抗磁性漂移效应可以稳定 QH 模式等离子体中以与等离子体电流相反的方向旋转的扭结/剥离模式，尽管人们已经认识到，无论其方向如何，单独的旋转都会使模式不稳定。负责稳定的物理机制被确定为通过旋转和离子抗磁漂移之间的耦合来减少动态压力的不稳定效应。通过切换旋转方向，可以利用耦合效应来稳定和不稳定扭结/剥离模式，这种趋势可能是 DIII-D 中的 QH 模式等离子体有利于与等离子体电流方向相反的环形旋转的原因。
MHD stability at edge pedestal in a QH-mode plasma in DIII-D was analyzed by taking into account plasma rotation and ion diamagnetic drift effects. We have found that the coupled rotation and ion diamagnetic drift effects can stabilize a kink/peeling mode in the QH-mode plasma rotating in the direction counter to the plasma current, although it has been recognized the rotation alone destabilizes the mode regardless of its direction. The physics mechanism responsible for the stabilization was identified as reduction of the destabilizing effect by dynamic pressure through the coupling between the rotation and the ion diamagnetic drift. The coupling effect can be harnessed to both stabilize and destabilize the kink/peeling mode by switching the rotation direction, the trend which could be the reason that the QH-mode plasmas in DIII-D favor toroidal rotation counter to the plasma current direction.