A kinetic Landau-Fluid closure for cut-off Maxwellian distribution

A new kinetic Landau-Fluid closure, based on the arbitrary truncated Maxwellian distribution is derived. A special case is considered in the static limit (the frequency ). This analytical closure recovers the kinetic Landau-Fluid closure when the cut-off velocity in the truncated Maxwellian distribution function is infinity. The gradient of perturbed heat flux ∂q/∂z is related with both ∂T/∂z and ∂²T/∂z². We find an additional heat flux caused by the average velocity of particles when the truncated Maxwellian distribution is asymmetric. A physics explanation of the closure will be discussed. It is a general Landau-Fluid closure for fluid moment models, that suits a particles distribution in an open magnetic field line region, such as the Scape-Off-Layer (SOL) of tokamak plasmas.