Fully Kinetic, Electromagnetic Particle-in-Cell Simulations of Plasma Microturbulence  

作　　者：J.L.V.Lewandowski L.E.Zakharov Plasma Physics 

机构地区：[1]Laboratory,Princeton University,P.O.Box 451,Princeton,NJ 08543,USA.

出　　处：《Communications in Computational Physics》2007年第4期684-722,共39页计算物理通讯（英文）

摘　　要：A novel numerical method,based on physical intuition,for particle-in-cell simulations of electromagnetic plasma microturbulence with fully kinetic ion and electron dynamics is presented.The method is based on the observation that,for lowfrequency modes of interest[ω/ω_(ci)≪1,ωis the typical mode frequency andωci is the ion cyclotron frequency]the impact of particles that have velocities larger than the resonant velocity,v^(r)∼ω/k_(||)(k_(||) is the typical parallel wavenumber)is negligibly small(this is especially true for the electrons).Therefore it is natural to analytically segregate the electron response into an adiabatic response and a nonadiabatic response and to numerically resolve only the latter:this approach is termed the splitting scheme.However,the exact separation between adiabatic and nonadiabatic responses implies that a set of coupled,nonlinear elliptic equations has to be solved;in this paper an iterative technique based on the multigrid method is used to resolve the apparent numerical difficulty.It is shown that the splitting scheme allows for clean,noise-free simulations of electromagnetic drift waves and ion temperature gradient(ITG)modes.It is also shown that the advantage of noise-free kinetic simulations translates into better energy conservation properties.

关 键 词：Plasma micro-turbulence particle-in-cell simulation multigrid solver. 

分 类 号：O17[理学—数学]