P40 - Modeling a Novel Laser-Driven Electron Acceleration Scheme: Particle-In-Cell Simulations at the Exascale
DescriptionIntense femtosecond lasers focused on low-density gas jets can accelerate ultra-short electron bunches up to very high energies (from hundreds of MeV to several GeV) over a few millimeters or a few centimeters. However, conventional laser-driven electron acceleration schemes do not provide enough charge for most of the foreseen applications. To address this issue, we have devised a novel scheme consisting of a gas jet coupled to a solid target to accelerate substantially more charge. In 2022 we validated this concept with proof-of-principle experiments at the LOA laser facility (France), and with a large-scale Particle-In-Cell simulation campaign, carried out with the open-source WarpX code. Performing such simulations requires the use of the most powerful supercomputers in the world, as well as advanced numerical techniques such as mesh refinement, which is very challenging to implement in an electromagnetic Particle-In-Cell code, and indeed unique to the WarpX code. A work describing the technical challenges that we addressed to make these simulations possible was awarded the Gordon Bell prize in 2022. In this contribution, we will also discuss the performance portability of the WarpX code by presenting scaling tests on Frontier, Fugaku, Summit, and Perlmutter supercomputers.
TimeTuesday, June 2710:10 - 10:12 CEST