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

Abstract

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.