Dust-acoustic Waves with a Non-thermal Ion Velocity Distribution

The effect of a non‐thermal ion velocity distribution is studied on linear and nonlinear dust‐acoustic waves in an unmagnetized three component dusty plasma. For the linear theory, electrons are Boltzmann distributed, ions are treated kinetically with a non‐thermal ion velocity distribution and the dust particles are considered to be streaming with respect to ions. It is found that growth of the waves is possible when streaming velocity of the dust particles is larger than the phase velocity of the dust‐acoustic wave. The model is used to study nonlinear dust acoustic waves.