Toward the modeling of chains of plasma accelerator stages with WarpX

The Particle-In-Cell code WarpX is being developed by a team of the U.S. DOE Exascale Computing Project to enable the modeling of chains of tens of plasma accelerators on exascale supercomputers, for future collider designs. The code is combining the latest algorithmic advances (e.g., boosted frame, pseudo-spectral Maxwell solvers) with mesh refinement and runs on the latest CPU and GPU architectures. An example of the application to the modeling of up to three successive muti-GeV stages is presented. The latest implementation on GPU architectures is also reported.