Physical Interpretation of Current Start-Up by rf in WT-2 Tokamak
Physical Interpretation of Current Start-Up by rf in WT-2 Tokamak
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WT-2 托卡马克中射频当前启动的物理解释
DOI：
10.1143/jpsj.54.1360
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发表时间：
1985
影响因子：
1.7
通讯作者：
M. Okamoto
中科院分区：
文献类型：
--
作者：
T. Shimozuma;J. Takahashi;Hitoshi Tanaka;T. Maekawa;Y. Terumichi;Shigetoshi Tanaka;M. Okamoto
为了揭示WT-2托卡马克等离子体电流启动实验的物理机制，计算求解了包含电子回旋波（ECW）和低杂波（LHW）准线性扩散项、粒子损失和能量损失的二维Fokker-Planck方程。计算结果如下：在初始电子回旋加热等离子体中，施加的垂直场bv抵消了一些电子的环向漂移，这些电子产生电流产生极向场，并被限制在平衡位置。产生的电流对电压的依赖关系与实验结果定性地一致。此外，电子在垂直方向被ECW加速后，通过库仑碰撞被俯角散射到平行方向，并与具有高相速度的LHW发生拟线性相互作用，产生环向电流启动。
In order to reveal the physical mechanism of the plasma current start-up experiment by rf in WT-2 tokamak, a two dimensional Fokker-Planck equation, which includes quasilinear diffusion terms of electron cyclotron wave (ECW) and lower hybrid wave (LHW), particle and energy losses, is solved computationally. The calculations show the following results; In the initial electron cyclotron heating plasma, the applied vertical field B V cancels the toroidal drift for some electrons which generate a current to produce the poloidal field and the electrons are confined in an equilibrium position. The dependence of generated currents on B V qualitatively agrees with experimental results. Further, the electrons, which are accelerated in the perpendicular direction by ECW, are pitch-angle scattered by Coulomb collision to the parallel direction and quasilinearly interact with LHW having high phase velocity, resulting in a toroidal current start-up.