On beam-plasma interaction in a dust-electron plasma

The generation of electron plasma waves by low-energy electron beams in a d ust-electron plasma, generated by UV induced photoemission or radiative hea ting of grains, is considered. It is shown that finite amplitude Langmuir w aves might be produced due to the usual two-stream (beam-plasma) instabilit y under certain conditions. Langmuir waves mag saturate by beam trapping an d attain finite amplitudes. Large amplitude Langmuir waves can nonlinearly interact with dust acoustic waves due to the parametric process. However, f or the parameters considered, the rates of the decay and modulational inter actions of Langmuir waves in the dust-electron plasma are much smaller than electron collisional damping rates.