A comparison of weak-turbulence and particle-in-cell simulations of weak electron-beam plasma interaction

摘要: Quasilinear theory has long been used to treat the problem of a weak electron beam interacting with plasma and generating Langmuir waves. Its extension weak-turbulence treats resonant interactions these waves other wave modes, in particular, ion-sound These are strongly damped equal ion temperatures, as sometimes seen in, for example, solar corona wind. Weak turbulence is derived damping limit, term describing then added. In this paper, we use EPOCH particle-in-cell code numerically test range electron-ion temperature ratios. We find that cold results agree well, but increasing three-wave resonance becomes broadened proportion rate. Additionally, establish lower limits on number simulation particles needed accurately reproduce distributions their saturated states intermediate time evolution. should be taken into consideration simulations generation Type III radio bursts from wind investigations ion-acoustic lines ionosphere.