Topic/Type: 1. Plasma Simulation, Oral

Applications of the wave kinetic approach: From laser wakefields to drift wave turbulence

R. Trines

Rutherford Appleton Laboratory, UK

Nonlinear wave-driven processes in plasmas are normally described by either a
monochromatic pump wave that couples to other monochromatic waves or as a
random phase wave coupling to other random phase waves. An alternative
approach involves a random or broadband pump coupling to monochromatic
and/or coherent structures in the plasma. This approach can be implemented
through the wave kinetic model. In this model, the incoming pump wave is
described by either a bunch for coherent waves or a sea for random phase
waves of quasiparticles. This approach has been applied to both photon
acceleration in laser wakefields and drift wave turbulence in magnetised
plasma edge configurations in tokamaks and space plasmas. A particle model
has been used to describe the individual wave modes, while a fluid description
has been used for the plasma. Numerical simulations have been compared
to experiments, varying from photon acceleration to drift mode-zonal flow
turbulence, and good correspondences have been found in all cases.