Dust-acoustic wave instabilities in collisional plasmas
Current-driven dust-acoustic wave instabilities in a collisional plasma with variable-charge dusts are studied. The effects of electron and ion capture by the dust grains, the ion drag force, as well as dissipative mechanisms leading to changes in the particle numbers and momenta, are taken into account. Conditions for the instability are obtained and discussed for both weak and strong ion drag. It is shown that the threshold external electric field driving the current is relatively large in dusty plasmas because of the large dissipation rates induced by the dusts. The current-driven instability may be associated with dust cloud filamentation at the initial stages of void formation in dusty RF discharge experiments.
Ostrikov
KN
Institut fur Theoretische Physik I, Ruhr-Universitat Bochum, D-44780 Bochum, Germany and School of Science, Nanyang Technological University, 259756 Singapore.
Vladimirov
SV
Yu
MY
Morfill
GE