2. Po-Yen Lai and Wen- Jun Ding, “Discrete-particle effect on weibel-type instability in Particle-in-cell simulations with monte-carlo collisions”, 47th IEEE International Conference on Plasma Science (ICOPS2020), Singapore, 6-10 December 2020.
Abstract:
According to observations in earlier works, discrete-particle effect in electrostatic (ES) particle-in-cell (PIC) simulations is an intrinsic artifact to potentially change dynamic properties of the simulated plasma system. The full convergent results will be quite difficult to achieve when Monte-Carlo collisions are considered into simulations. However, the literatures about the study of discrete-particle effects on physical scenarios in electromagnetic (EM) PIC simulations are very rare.
In this work, we aim to reexamine Weibel-type instability in anisotropic plasmas using standard EM PIC schemes with consideration of Monte-Carlo collisions. Based on our simulation results, the numerical deviation of growth rate and saturation energy of Weibel-type instability, caused by discrete-particle effect, in 1D and 2D EM PIC simulations will be shown in this presentation. Furthermore, the relation between plasma parameter ND (i.e., number of particles in a Debye length for the 1D system or a Debye square for the 2D system) and the growth rate as well as saturation energy have been derived from the simulation results, which can be a guideline for choosing numerical parameters.
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Funding Info:
A*STAR SERC Young Individual Research Grants (YIRG No. A1784c0020)