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A Gyrokinetic simulation model for low frequency electromagnetic fluctuations in magnetized plasmas

Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 90-95页

作者： Liu Chen HaoTian Chen Fulvio Zonca Yu Lin Institute for Fusion Theory and Simulation and Department of Physics Zhejiang UniversityHangzhou 310027China Department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA Institute of Space Science and Technology Nanchang UniversityNanchang 330031China Center for Nonlinear plasma Science and C.R.ENEA Frascati-C.P.65 Frascati 00044Italy Physics Department Auburn UniversityAuburn AL 36849USA

We present a new model for simulating the electromagnetic fluctuations with frequencies much lower than the ion cyclotron frequency in plasmas confined in general magnetic configurations.This novel model(termed as GK-E&B)employs nonlinear gyrokinetic equations formulated in terms of electromagnetic fields along with momentum balance equations for solving fields.It,thus,not only includes kinetic effects,such as wave-particle interaction and microscopic(ion Larmor radius scale)physics;but also is computationally more efficient than the conventional formulation described in terms of potentials.As a benchmark,we perform linear as well as nonlinear simulations of the kinetic Alfvén wave;demonstrating physics in agreement with the analytical theories.

关键词： plasma kinetic equations Gyrokinetics Gyrokinetic simulations particle orbit and trajectory

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Electromagnetic High Frequency Gyrokinetic Particle-in-Cell Simulation

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Communications in Computational Physics 2008年第8期4卷 575-591页

作者： R.A.Kolesnikov W.W.Lee H.Qin plasma Physics Laboratory Princeton UniversityP.O.Box 451PrincetonNew Jersey 08543USA

Using the gyrocenter-gauge kinetic theory,an electromagnetic version of the high frequency gyrokinetic numerical algorithm for particle-in-cell simulation has been developed.The new algorithm,being an alternative to a direct Lorentz-force simulation,offers an efficient way to simulate the dynamics of plasma heating and current drive with radio frequency waves.Gyrokinetic formalism enables separation of gyrocenter and gyrophase motions of a particle in a strong magnetic field.From this point of view,a particlemay be viewed as a combination of a slow gyrocenter and a quickly changing Kruskal ring.In this approach,the nonlinear dynamics of high frequency waves is described by the evolution of Kruskal rings based on first principles physics.The efficiency of the algorithm is due to the fact that the simulation particles are advanced along the slow gyrocenter orbits,while the Kruskal rings capture fast gyrophase physics.Moreover,the gyrokinetic formalism allows separation of the cold response from kinetic effects in the current,which allows one to use much smaller number of particles than what is required by a direct Lorentz-force simulation.Also,the new algorithm offers the possibility to have particle refinement together with mesh refinement,when necessary.To illustrate the new algorithm,a simulation of the electromagnetic low-hybrid wave propagating in inhomogeneous magnetic field is presented.

关键词： Gyrokinetics magnetized plasmas plasma kinetic equations

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