On beam-plasma interaction in a dust-electron plasma

The generation of electron plasma waves by low-energy electron beams in a dust-electron plasma, generated by UV induced photoemission or radiative heating of grains, is considered. It is shown that finite amplitude Langmuir waves might be produced due to the usual two-stream (beam-plasma) instability under certain conditions. Langmuir waves may saturate by beam trapping and attain finite amplitudes. Large amplitude Langmuir waves can nonlinearly interact with dust acoustic waves due to the parametric process. However, for the parameters considered, the rates of the decay and modulational interactions of Langmuir waves in the dust-electron plasma are much smaller than electron collisional damping rates.