FLUID CLOSURES WHICH MIMIC WAVE-PARTICLE INTERACTIONS IN STRONG LANGMUIR TURBULENCE

A new two-time-scale model of strong Langmuir turbulence has been cons tructed, using higher-moment fluid equations with dissipative closures designed to better simulate Vlasov theory predictions of linear wave properties, and to treat collisionless heating of particles by waves. Numerical solutions are carried out in a study of electron heating ass ociated with collapse and burnout of a large-amplitude initial Langmui r wave and in a study of radiation-driven Langmuir turbulence interact ing with ion-acoustic quasimodes in plasmas with T(e) almost-equal-to T(i).