MODELING COMBINED COLLISIONAL COLLISIONLESS PLASMA INTERPENETRATION/

This paper describes one technique by which multifluid modeling capabi lity can be achieved within the context of a Lagrangean single-fluid m odel, This technique is applied to the interpenetration of laser-produ ced, substantially collisionless plasmas. A single-fluid model by itse lf cannot simulate the interpenetration of a collisionless plasma corr ectly, but must be augmented with some other tool, One tool that can c alculate collisionless plasma interpenetration correctly is ISIS, a pa rticle code for plasma simulations which includes appropriate collisio n models. However, ISIS does not have the necessary physics to do the laser deposition, the atomic physics, the radiation transport, and doe s not possess a realistic electron temperature model, With appropriate integration of the single-fluid code and ISIS, a new capability is ac hieved which allows simulation of the colliding plasma problem, a prob lem that neither code can properly simulate individually.