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In this paper, the collective dynamics of the large aspect ratio dusty plasmais studied over a wide range of discharge parameters. An inductively coupleddiffused plasma, which creates an electrostatic trap to confine the negativelycharged grains, is used to form a large volume (or large aspect ratio) dustyplasma at low pressure. For introducing the dust grains into the potentialwell, a unique technique using a secondary DC glow discharge plasma isemployed. The dust dynamics is recorded in a 2-dimension (2D) plane at a givenaxial location. The dust fluid exhibits wave like behavior at low pressure (p <0.06 mbar) and high rf power (P > 3 W). The mixed motion, waves and vortices,are observed at an intermediate gas pressure(p = 0.08 mbar) and low power (P <3 W). Above the threshold value of gas pressure (p > 0.1 mbar), the clockwiseand anti-clockwise co-rotating vortex series are observed on the edges of thedust cloud, whereas the particles in central region show the random motion.These vortices are only observed above a threshold width of the dust cloud. Thestreaming ions are considered the available free energy source to excite thewaves in dust grain medium. The occurrence of the co-rotating vortices isunderstood on the basis of the charge gradient of dust particles which isorthogonal to the gravity. The charge gradient is a consequence of the plasmainhomogeneity from the central region to the outer edge of dust fluid. Since, avortex has the characteristic size in the dissipative medium; therefore, aseries of the co-rotating vortex on the both sides of dusty plasma is observed.The experimental results on the vortex formation and its multiplicity arecompared to an available theoretical model and are found to be in closeagreement.

Collective dynamics of large aspect ratio dusty plasma in an inhomogeneous plasma background: Formation of the co--rotating vortex series