Integrated simulation analysis of the HL-2M high-parameter hybrid scenario

On the basis of the OMFIT integrated simulation platform and the parameters of the HL-2M device, a hybrid scenario with a typical safety factor q profile is simulated using the joint injection method of neutral beam and electron cyclotron wave with a normalized toroidal beta ( β _N ) of 2.39. At the same time, by analyzing the effect of impurity concentration ( Z _eff ) and pedestal density ( n _e,ped ) on confinement, a higher parameters hybrid scenario is obtained, with β _N reaching 3.118. The research results indicate that the turbulent stabilization effect caused by Z _eff gradually decreases from strong to weak with the increase of Z _eff , whereas the radiation power loss increases linearly as Z _eff increases. Consequently, there exists an optimal Z _eff value for optimal confinement. In addition, it is found that the optimal Z _eff value decreases with the increase of n _e,ped . The research results are crucial for the HL-2M device to accomplish the 1 MA advanced scenario discharge target, and they serve as a reference for future impurity seeding experiments.