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Slow Plastic Creep Of 2d Dusty Plasma Solids, Angela Douglass, Peter Hartmann, Aniko Zs. Kovacs, Jorge C. Reyes, Lorin S. Matthews, Truell W. Hyde
Slow Plastic Creep Of 2d Dusty Plasma Solids, Angela Douglass, Peter Hartmann, Aniko Zs. Kovacs, Jorge C. Reyes, Lorin S. Matthews, Truell W. Hyde
Articles
We report complex plasma experiments, assisted by numerical simulations, providing an alternative qualitative link between the macroscopic response of polycrystalline solid matter to small shearing forces and the possible underlying microscopic processes. In the stationary creep regime we have determined the exponents of the shear rate dependence of the shear stress and defect density. We show that the formation and rapid glide motion of dislocation pairs in the lattice are dominant processes.
Determination Of The Levitation Limits Of Dust Particles Within The Sheath In Complex Plasma Experiments, Angela Douglass, Victor Land, Ke Qiao, Lorin Matthews, Truell Hyde
Determination Of The Levitation Limits Of Dust Particles Within The Sheath In Complex Plasma Experiments, Angela Douglass, Victor Land, Ke Qiao, Lorin Matthews, Truell Hyde
Articles
Experiments are performed in which dust particles are levitated at varying heights above the powered electrode in a radio frequency plasma discharge by changing the discharge power. The trajectories of particles dropped from the top of the discharge chamber are used to reconstruct the vertical electric force acting on the particles. The resulting data, together with the results from a self-consistent fluid model, are used to determine the lower levitation limit for dust particles in the discharge and the approximate height above the lower electrode where quasineutrality is attained, locating the sheath edge. These results are then compared with current …