ON A MODIFICATION OF MHD-MODELS FOR Z-PINCH

Numerical modeling of fast Z-pinch dynamics which allows for effects o f electron magnetohydrodynamics is discussed; of these, the most impor tant manifestation proves to be nonlinear convective penetration of fi eld (current) into the plasma of Z-pinch. This highly nontrivial dynam ics can be modeled using a relatively simple modification of the diffu sion equation for magnetic field and the equation of heating of plasma particles. Two models of this type are suggested - for a one-scale pi nch and for a thin liner. As a consequence, this opens possibilities o f numerical modeling of processes that involve the effects of electron magnetohydrodynamics on the basis of reliable, simple, and well-opera ting MHD codes.