Ultrahigh-order Maxwell solver with extreme scalability for electromagnetic PIC simulations of plasmas

Henri Vincenti 1, 2, 3 Jean-Luc Vay 2
3 PHI - Physique à Haute Intensité
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)
Abstract : The advent of massively parallel supercomputers, with their distributed-memory technology using many processing units, has favored the development of highly-scalable local low-order solvers at the expense of harder-to-scale global very high-order spectral methods. Indeed, FFT-based methods, which were very popular on shared memory computers, have been largely replaced by finite-difference (FD) methods for the solution of many problems, including plasmas simulations with electromagnetic Particle-In-Cell methods. For some problems, such as the modeling of so-called “plasma mirrors” for the generation of high-energy particles and ultra-short radiations, we have shown that the inaccuracies of standard FD-based PIC methods prevent the modeling on present supercomputers at sufficient accuracy. We demonstrate here that a new method, based on the use of local FFTs, enables ultrahigh-order accuracy with unprecedented scalability, and thus for the first time the accurate modeling of plasma mirrors in 3D.
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https://hal-cea.archives-ouvertes.fr/cea-01894332
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Submitted on : Friday, October 12, 2018 - 12:31:50 PM
Last modification on : Thursday, February 7, 2019 - 5:14:44 PM

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Henri Vincenti, Jean-Luc Vay. Ultrahigh-order Maxwell solver with extreme scalability for electromagnetic PIC simulations of plasmas. Computer Physics Communications, Elsevier, 2018, 228, pp.22 - 29. ⟨10.1016/j.cpc.2018.03.018⟩. ⟨cea-01894332⟩

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