H-mode experimental integrated modeling of impurity injection to control divertor heat flux on HL-2A

Based on the METIS integrated modeling platform, combined with the experimental data of the #34512 shot detached divertor operation on the HL-2A, this paper selects suitable physical models, and compares and analyzes the integrated modeling results with the experimental results. The modeling results are in good agreement with the experimental results. On this basis, the reason for the decrease of the peak heat flux on the divertor targets is investigated using the METIS simulator. The results show that the two factors of entering the H-mode and the radiation enhancement effect generated by impurity injection work together to reduce the heat flow on the targets. Finally, the different effects of N, Ar and Ne impurity gases on the heat flux reduction of the targets are simulated under the condition that the plasma line-average effective charge ( Z eff ) is kept unchanged. The results show that N and Ar are both better than Ne in controlling the heat flow on the targets, and N has the best compatibility in the core, which can not only reduce the boundary heat flow but also maintain the core confinement performance.