CFETR不同位置充气下的辐射偏滤器模拟研究

利用边缘等离子体数值模拟程序SOLPS对氩杂质注入下中国聚变工程试验堆装置辐射偏滤器运行模式进行了模拟研究。在达到相同的总辐射功率(P_rad~170MW)时，四种不同充气方案下(从上游充入氘氩混合气体，从外偏滤器充入氘氩混合气体，从内偏滤器充入氘氩混合气体，从上游充入氘气的同时从外偏滤器充入氩气) 在外中平面的模拟区域内边界(ρ=0.9)处的有效离子电荷数Zeff分别为2.8、3.1、3.4、2.7。模拟结果与DIII-D及C-MOD的实验结论一致。当从上游充入氘气时，可以增强刮削层中的本底等离子体流，从而得到相对更好的杂质屏蔽效果；同时由于偏滤器靶板再循环杂质源占主导作用，注入氩气的位置对于模拟结果影响不大。

Simulation study of the radiative divertor under different gas puffing locations for CFETR

The simulation study of the radiative divertor for China Fusion Engineering Test Reactor (CFETR) was performed with argon impurity puffing using the edge plasma numerical simulation code package SOLPS. The simulated Zeff at the core-edge boundary (ρ=0.9) of the outer mid-plane are 2.8, 3.1, 3.4 and 2.7, respectively, for four different gas puffing schemes (deuterium and argon mixed gas puffing from upstream; deuterium and argon mixed gas puffing from outer divertor; deuterium and argon mixed gas puffing from inner divertor; deuterium gas puffing from upstream and argon puffing from outer divertor) with fixed total radiated power (P_rad~170MW). The simulation results are similar to the experimental observation on DIII-D and C-MOD. Better impurity screening can be achieved with deuterium puffed from upstream due to the increased background plasma flow in the scrap-off layer, while the puffing location of argon has a minor influence on the simulation results since divertor target recycling is the major impurity source.