Nonlinear Stability and Saturation of Ballooning Modes in Tokamaks.
Nonlinear Stability and Saturation of Ballooning Modes in Tokamaks.
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DOI：
10.1103/physrevlett.116.235001
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发表时间：
2016-01
影响因子：
8.6
通讯作者：
C. Ham;S. Cowley;G. Brochard;H. R. Wilson-H. R.-Wilson-2253514205
中科院分区：
文献类型：
--
作者：
C. Ham;S. Cowley;G. Brochard;H. R. Wilson-H. R.-Wilson-2253514205
提出了椭圆磁通管非线性“气球”位移的托卡马克稳定性理论。在临界压力分布以上，等离子体中存储的能量可能会因此类管的有限（但不是无穷小）位移而降低（亚稳态）。在较高的压力分布（线性稳定边界）之上，此类管是线性和非线性不稳定的。预测的饱和通量管位移可以是压力梯度标度长度的量级。来自这些移位通量管的等离子体传输可以解释一些实验中限制的快速丧失。
The theory of tokamak stability to nonlinear "ballooning" displacements of elliptical magnetic flux tubes is presented. Above a critical pressure profile the energy stored in the plasma may be lowered by finite (but not infinitesimal) displacements of such tubes (metastability). Above a higher pressure profile, the linear stability boundary, such tubes are linearly and nonlinearly unstable. The predicted saturated flux tube displacement can be of the order of the pressure gradient scale length. Plasma transport from these displaced flux tubes may explain the rapid loss of confinement in some experiments.