Radial electric field during dynamic processes in a tokamak and L-H transitions
Radial electric field during dynamic processes in a tokamak and L-H transitions
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DOI：
10.1134/1.1354218
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发表时间：
2001-03
影响因子：
1.1
通讯作者：
V. Rozhansky;S. Voskoboinikov;A. Popov
中科院分区：
文献类型：
--
作者：
V. Rozhansky;S. Voskoboinikov;A. Popov
在考虑了纵向电子粘度（或相关的韦尔漂移）的额外贡献后，导出了托卡马克中径向电场的表达式。结果表明，在等离子体边缘环向电场增大的瞬态过程中，附加电场会变得相当强。极向等离子体旋转剪切的增加可以触发L-H跃迁。实验观察到的向改进约束模式的转变可以归因于这种效应，并通过在图曼- 3m托卡马克中模拟当前爬坡实验中的放电来说明。
Expressions for the radial electric field in tokamaks are derived with allowance for an additional contribution of the longitudinal electron viscosity (or the associated Ware drift). It is shown that, in transient processes during which the toroidal electric field at the plasma edge increases, the additional electric field can become rather strong. An increase in the shear of the poloidal plasma rotation can trigger the L-H transition. That the experimentally observed transitions to an improved confinement mode can be ascribed to this effect is illustrated by simulating discharges in the current ramp-up experiments in the Tuman-3M tokamak.