A Fluid-kinetic Hybrid Electron Model for Electromagnetic Simulations

Lin, Zhihong ; Chen, Liu

Princeton University. Plasma Physics Laboratory.

关键词: Electrons;    Plasma Instability;    70 Plasma Physics And Fusion Technology;    Dielectric Materials;    Plasma Simulation;   

DOI  :  10.2172/775535
RP-ID  :  PPPL-3536
RP-ID  :  AC02-76CH03073
RP-ID  :  775535

美国|英语

来源: UNT Digital Library

【 摘 要 】

A fluid-kinetic hybrid electron model for electromagnetic simulations of finite-beta plasmas is developed based on an expansion of the electron response using the electron-ion mass ratio as a small parameter (Here beta is the ratio of plasma pressure to magnetic pressure.) The model accurately recovers low-frequency plasma dielectric responses and faithfully preserves nonlinear kinetic effects (e.g., phase space trapping). Maximum numerical efficiency is achieved by overcoming the electron Courant condition and suppressing high-frequency modes. This method is most useful for nonlinear kinetic (particle-in-cell or Vlasov) simulations of electromagnetic microturbulence and Alfvenic instabilities in magnetized plasmas.