Modernization of the PIC codes for exascale plasma simulation

摘要

Particle simulation in the field of nuclear fusion is a well-established technique which has spawned dozens of codes around the world through years (e.g. BIT1, VPIC, VSIM, OSIRIS, REMP, EPOCH, SMILEI, FBPIC, GENE, WARP, PEPC) with varying degrees of specialization for different physic areas and accessibility. By leveraging advanced algorithmic features we propose to implement key for genuine pre-exascale capability. While more expensive than conventional mesh-based particle simulation, proposed approach eliminates artificial grid-generated noise by design and offers a more direct method for treating complex simulation case. A combined library would make coupling of mesh-based and mesh-free methods a lot easier. Strategically this work is expected to benefit not only by future users, but will also provide a fully alternative approach for high-fidelity modelling.