Integrated modeling of improving core confinement with ECW based on HL-3 hybrid scenario

The control of safety factor profile helps to reduce turbulent transport and improve core confinement. Based on HL-3 device parameters, this study employs METIS to investigate control laws of safety factor profile through adjustments of ECW power peak deposition position, deposition width, ramp-up rate, ramp-up time, and plasma effective charge number, while analyzing their impacts on core confinement performance in hybrid scenarios. By appropriately adjusting the power deposition position and width of ECW, as well as regulating its power ramp-up time, safety factor profile can be maintained with characteristics of zero magnetic shear hybrid scenario. At the same time, transport barrier will form in the dynamic profiles, the transport coefficient will reduce, plasma parameters and core confinement will improve significantly. Moreover, the effect of ECW on the improvement of core confinement in the plasma current ramp-up phase is studied.