Ion Larmour radius effect on rf ponderomotive forces and induced poloidal flow in tokamak plasmas

Analytical approximations are used to clarify the effect of Larmour radius on rf ponderomotive forces and on poloidal flows induced by them in tokamak plasmas. The electromagnetic force is expressed as a sum of a gradient par t and of a wave momentum transfer force, which is proportional to wave diss ipation. The first part, called the gradient electromagnetic stress force; is combined with fluid dynamic (Reynolds) stress force, and gyrovicosity is included into viscosity force to model finite ion Larmour radius effects i n the momentum response to the rf fields in plasmas. The expressions for th e relative magnitude of different forces for kinetic Alfven waves and fast waves are derived.