Particle Simulation Of Plasma Wave In Cyclical Resonance Heating Of Alvin

In order to cope with the increasingly serious energy crisis, scientists are studying theohmic heating, neutral beam heating, radio-frequency (RF) heating and other heatingmethods to make the plasma in controlled thermonuclear fusion device to obtain the idealignition temperature. Alfvén waves heating (AWH), as an important method of RF heating,has received more and more attentions.In this paper, based on a particle simulation (PIC) method, we study the sub-cyclotronresonant interaction process of Alfvén waves propagation along the background magneticfield and homogenous magnetized plasma. The simulation results show that the during thesub-cyclotron resonance heating process the proton temperature increases both in paralleland perpendicular to the background magnetic field direction; but along the verticaldirection the temperature rise quickly. Moreover, different wave frequencies influence theresonance heating effects of wave particles. Compared to non-resonance heating, theresonance heating has higher efficiency. The particles’ dynamics temperature extremumobtained by the random heating is only related to the phase velocity of the wave, while hasnothing to do with wave’s frequency.In addition, the article also detailed comparison of the Alfvén waves sub-cyclotronresonance heating and stochastic heating process. In Alfvén waves resonance heating theproton is captured in the vertical direction, which results in proton presenting periodicdistribution in the Z-Vx phase space. The proton will generate phase difference because ofthe thermal motion in parallel direction, which makes the proton heat along the direction ofthe wave. This can be attributed to the nonlinear coupling of motion and rotary motion ofthe guidance center which is triggered by wave, this model not only can explain theprocess of laboratory plasma heating, but also can interpret the high-speed charged particlephenomenons in the astrophysical environments.The sub-cyclotron resonance heating for two Alfvén waves with different phasedifference is studied. It is found that when two left-handed waves sub-cyclotron resonatewith proton at the same time,(1) the particle is first heated in the direction perpendicular tothe magnetic field, after a period of time the particle velocity in the parallel directionexceeds the vertical direction. Finally, the particle heating appears anisotropy.(2) a large particles velocity flow appears in plasma, and the growth rate of the velocity flowincreases first and then decreases.