A note on ion-dust streaming instability in a collisional dusty plasma

摘要

This note investigates an ion-dust streaming instability with frequency ω less than the dust collision frequency v_d, in an unmagnetized collisional dusty plasma. Under certain conditions, a resistive instability can be excited by an ion drift on the order of the ion thermal speed, even when the dust acoustic wave is heavily damped. The effect of weak collisions on the usual dust acoustic instability in the regime ω > v_d is also considered. Applications to experimental observations of low-frequency fluctuations in laboratory d.c. glow discharge dusty plasmas are discussed.