Plasma and Fusion Research

Volume 13, 1203088 (2018)

Rapid Communications


An Ingenious Plasma Simulation Model for Large-Scale System with Self-Consistent Electron Dynamics
Tomonori TAKIZUKA, Kenzo IBANO and Masatoshi YAGI1)
Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
1)
National Institutes for Quantum and Radiological Science and Technology, Rokkasho 039-3212, Japan
(Received 12 April 2018 / Accepted 8 June 2018 / Published 10 July 2018)

Abstract

An ingenious model for large-scale plasma simulations is proposed. An artificial permittivity ε much grater than ε0 (permittivity of free space) is introduced to the Poisson equation, ∇⋅(ε∇φ) = −ρ (φ is electrostatic potential and ρ is charge density), and the Debye length is artificially elongated. A large-scale system with a reasonable number of spatial grids can be treated stably even for including the self-consistent electron dynamics. A dielectric tensor is adopted for the three-dimensional global simulation of tokamak plasmas in the cylindrical coordinates (R, θ, Z). A diagonal element εθθ for toroidal axis θ is set much larger than those for the poloidal plane, εRR = εZZ = ε. Number of toroidal meshes Nθ can be reduced enough smaller than that of poloidal-plane meshes, NR and NZ, in comparison with Nθ > NR, NZ for the usual case of isotropic ε.


Keywords

simulation model, global plasma, electron dynamics, Poisson equation

DOI: 10.1585/pfr.13.1203088


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