Physics of The Upper Limit of Electron Density of Tokamak Plasma

采用两点SOL模型，研究了托卡马克刮擦层（SOL）内电子温度T_<eS>、电子密度n_<eS>、导流板附近电子温度T_<eD>、电子密度n_<eD>与隔板上热负荷q_*之间的关系，并考虑了最近实验观测到的电子温度和离子温度的差异以及电子温度和密度的径向衰变长度的差异。该模型适用于分离矩阵处电子温度恒定的边界条件。利用该模型计算了各种SOL参数，并与JT60U、JET和Alcator C Mod的实验结果进行了比较，结果吻合较好。导出了分离等离子体溶胶参数的标度。利用该模型对国际托卡马克实验堆的SOL参数进行了预测。

The relations between electron temperature T_<eS>, electron density n_<eS> in a scrape-off-layr (SOL) of tokamak, electron temperature T_<eD>, electron density n_<eD> near divertor plate and heat load q_* across separatrix are studied by a two points SOL model, which includes the effects of recent experimental observations such as the difference of electron and ion temperatures as well as the difference of radial decay lengths of electron temperature and density. This model adapts the boundary condition of constant electron temperature at the separatrix.The various SOL parameters are calculated by this model and compared with the experimental results of JT60U,JET and Alcator C Mod. They are consistent with each other. The scaling of SOL parameters of detached plasma are derived.The SOL parameters of ITER (Internation Tokamak Experimental Reactor) are predicted by this model.