| During the development of plasma physics,the interaction between waves and plasmas is always a research focus in this field.Based on this central point,the interaction between electromagnetic wave,electron cyclotron resonant wave,drift wave and plasmas has been studied.The main innovation points of the research are as follows:1.The physical model of beam-plasma system which is closer to experimental design has been investigated,and through using particle-in-cell simulation to simulate the interaction between the electromagnetic wave and plasmas,the self-focusing phenomenon has been observed.At the same time,the beam electrons oscillate in the transverse and longitudinal direction.In addition,using the proper plasma density,electron beam density and electron beam energy,the beam-plasma system can excite electromagnetic radiation in THz wave band.2.Field matching method is used to derive the “cold” dispersion relation of beam-plasma system,and the interaction mechanism between electromagnetic wave and plasmas has been studied through solving the dispersion equation.The study indicates that the interaction mode between electromagnetic wave and plasmas is hybrid mode,and under the condition of low electron beam density and high plasma density,the radiation mechanism is slow-wave radiation.3.Based on the interaction between electromagnetic wave and plasmas in beamplasma system,the plasma photonic crystal like beam-plasma system was proposed.And with the same simulation parameters as chapter 2,plasma-vacuum-plasma type plasma photonic crystal like beam-plasma system can also excite 0.9035 THz electromagnetic radiation and the electron efficiency is up to 10.5%.4.The poloidal electric field driven by electron cyclotron resonant wave is studied numerically and in HL-2A experiment.The study found that the poloidal electric field which is calculated numerically and monitored in HL-2A experiment is consistent.Also,the poloidal electric field is used to calculate the poloidal plasma rotation velocity versus time after injecting electron cyclotron resonant wave.5.The gyrokinetic code is used to calculate the drift wave and plasma transport.For linear simulation,the equilibrium and magnetic field from JET experiment is used to calculate the neoclassical transport in pedestal region.The radial electric field and the shear frequency of E ?B drift is calculated.For non-linear simulation,the equilibrium and magnetic field from AUG experiment is used to calculate the turbulent transport in pedestal region.The results show that the turbulence is smooth and steady.Through convergency test,it is proved that the simulation results are reliable. |
