Simple kinetic model for plasma in stochastic helical field

The kinetic equation for a plasma in stochastic electromagnetic helical field is constructed and examined. The kinetic equation contains additional term, proportional to the helicity. The solution describing evolution of the distribution function for arbitrary initial conditions is found and the possible consequences of the presence of the helicity term are discussed. Model example is considered when the single-momentum electron beam with inhomogeneous velocity profile creates a new particle flow in transverse direction, so that the resulting flow also possesses helicity. 13 refs. (author)