The roadmap towards scalable cross-beam energy transfer simulations

When multiple high-intensity laser beams overlap in a plasma, they can exchange energy via the cross-beam energy transfer (CBET) process. CBET is one of the dominating laser-plasma interactions that influences the efficiency of an inertial confinement fusion (ICF) implosion. However, modeling the CBET interaction within an ICF simulation poses a computational challenge at high resolution in 3D. Existing models either use simplifying assumptions to reduce the problem complexity at the expense of accuracy, or fail to harness modern hardware capabilities. In this work, we report on the testing and implementation of a 3D CBET package that follows best programming practices so it is able to scale efficiently on many processors and GPUs. We present our progress on development and validation, and share the roadmap for MPI and GPU implementations.