Molecular dynamics simulation for colletive phenomena in collisionless plasmas

Plasmas are constituted of many charged particles interacting via the long range Coulomb force, and exhibit various collective phenomena. To describe plasma dynamics, we usually utilize some theoretical models, such as fluid models, or kinetic models, depending on the scale we are focusing on. Those theories are developed by employing some coarse-graining assumptions. However, essentially, plasma dynamics can be understood by individual particle dynamics. Particle based simulations for macroscopic plasma dynamics are still computationally demanding, yet they become feasible (eg. [1]) thanks to the rapid growth of computation technology and simulation techniques.

In this work, we develop a molecular dynamics simulation code for collisionless plasmas using FDPS [2] (a framework for developing parallele particle simulation codes). The aim of this study is to demonstrate collective phenomena in plasmas, such as Debye shielding, waves, and Landau damping, from the first principle. This code will provide a useful tool to study mutiscale nature of plasmas.

[1] A. Panarese, J. Plasma Phys., 84, 905840308 (2018).
[2] M. Iwasawa, Publ. Astron. Sco. Japan, 68, 1 (2016).