Fluid Simulation On Interaction Between Resonant Magnetic Perturbation And Plasma In Tokamak

Edge localized mode(ELM)which causes untolerable energy flux is a major challengewhen Tokamaks are operated in H-mode.Resonant magnetic perturbation(RMP)is one of promising methods for ELM mitigation or suppression,but its concrete mechanism remains unclear,now it is far from obtaining predictive capability of ELM mitigation and suppression.As for RMP simulation,consistent evolution of plasma rotation or flow is neglected in linear response codes,and due to numerical method limitation,nonlinear response codes usually run with unrealistic high resistivity or with realistic resisitivity but in cylindrical geometry.In this paper,nonlinear plasma response and mode coupling are calculated with realistic resistivity under toroidal geometry.In this paper,the program for calculating magnetic field of different kinds of RMP configurations is developed based on some previous codes.Plasma response to RMP and the behaviour of ELM under RMP are simulated using reduced MHD equations solving in BOUT++ framework.Some properties of the interaction between plasma and RMP are shown.Particularly,stable ballooning modes get energy non-linearly from RMP and grow,changing plasma behavior under RMP.And in the simulations,it is found that the linear growth rates of peeling-ballooning modes nearly don't change under RMP magnetic field.The behaviors of the modes whose toroidal mode number equals to the RMP magnetic field period number are different with the modes whose not when RMP is employed.Resonant and non-resonant plasma response have different amplitudes,non-resonant response exists in ideal MHD scale and resonant response exists in resistive MHD scale.The amplitudes of perturbations whose mode numbers are not the fold of RMP period number can be completely suppressed when strong RMP is employed.This thesis includes two chapters.Chapter one is a general introduction and chapter two introduces simulations on interaction between RMP and plasma in this paper.Chapter one includes introductions for-the principle of magnetic confined fusion,plasma simulation and BOUT++ framework,ELM and RMP.Chapter two is made up by three parts,in the first part the construction of RMP magnetic field is introduced,the second part introduces numerical modal,the third part is analysis and discussion of simulation results.