Physics of The Upper Limit of Electron Density of Tokamak Plasma

用两点SOL模型研究了托卡马克刮离层(SOL)中的电子温度T&lt；Es&gt；、电子温度T&lt；Ed&gt；、偏滤器附近的电子密度n&lt；Ed&gt；以及隔板上的热负荷Q_*之间的关系。该模型考虑了电子和离子温度差、电子温度和密度的径向衰减长度差等实验观测的影响。该模型采用了分离物电子温度恒定的边界条件，计算了各种溶质参数，并与JT60U、JET和Alcator C Mod的实验结果进行了比较。它们是相互一致的。利用该模型对国际托卡马克实验堆(ITER)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.