Effects Of Different Initial Equilibrium Magnetic Shears On DTM Triggered By RMP

Energy is the cornerstone of the development of human civilization.From primitive civilization to modern society,Energy is the internal driving force to ensure the normal operation of society.The foundation of the national economy depends on the development and utilization of energy,and the control of energy determines the future destiny of a country.The modernization of the world economy benefits a lot from fossil energy.However,fossil energy is not inexhaustible,instead,these precious energy sources are rapidly depleting.In order to solve the energy crisis,countless researchers have devoted themselves into the search for new energy sources which can replace or even surpass traditional fossil energy sources,such as solar energy,wind energy,tidal energy and so on.But these energy sources cannot lift the crisis fundamentally,for these new energy sources still have various drawbacks in the process of development and use.Under this circumstance,light nuclear fusion technology provides an effective way to solve the energy crisis problem.Among which,Tokamak is regarded as the most likely device to achieve controlled nuclear fusion technology.However,there are still many difficulties in achieving this technology.The biggest obstacle is the unstable mode existing in the plasma,the so called “tearing mode”.According to the Magnetohydrodynamics(MHD)model,the effects of different initial equilibrium magnetic shears(s)on the double tearing mode(DTM)which triggered by the resonant magnetic perturbation(RMP)is studied by computer numerical simulation,and the evolution process of the inner and outer magnetic island structures under different magnetic shear is drawn.Based on our simulation results,as the initial equilibrium magnetic shear increases,the reverse magnetic flux in the system increases,and the time required for the system to evolve from the initial state to the steady state become shorter;what’s more,the polar velocity of the inner and outer magnetic islands has the same trend,which increase with the increasing s,and are approximately linear while the maximum polar velocity of the outer magnetic island is always greater than what of the inner magnetic island.