外加弱引力场对复杂等离子体的动力学影响

Dynamics of Charged Particles Under Weak External Force in the Complex Plasma

采用分子动力学模拟方法,结合带电粒子的牛顿运动方程及周期性边界条件,研究外加弱引力场对复杂等离子体中带电颗粒动力学性质所产生的影响。模拟计算结果发现:在外加弱引力的作用下,带电粒子最终位形均呈一个圆形晶体相分布,每个粒子在各自的平衡位置附近做周期性简谐振动,振动属性与所加外力有关。最后,通过速度自相关函数进一步分析了位形演变过程中带电粒子之间的关联属性。

The dynamic characteristics of charged particles with the effect of weak external force in the complex plasma system are studied by molecular dynamics numerical simulation method,combined with Newton equation of motion of charged particles and periodic boundary conditions.The simulation results show that the final configuration of charged particles is a circular crystal phase distribution.In steady state,the charged particles make a periodic simple harmonic oscillation near their equilibrium position.The oscillation direction and period are related to the direction and the magnitude of the external force.The velocity autocorrelation function(VACF)is employed to further analyze the internal relations of charged particles.