Magneto-gravitational dynamics of microparticles in complex plasma

by Dr Mostafa Salahshoor (School of Particles and Accelerators, IPM)

Wednesday 12 Apr 2017, 15:00 → 16:00 Asia/Tehran

Particles and Accelerators School Seminar Room (Larak)

Complex (dusty) plasma as an interdisciplinary research field has been considered as a test bed for fundamental research, after the discovery of crystalline plasma. Long response time and possibility of light video imaging of large sized massive dust grains facilitate experimental study of many important physical phenomena, at the most fundamental kinetic level. The most familiar examples are the self-organized structures such as chain, cluster and crystal, the phase transition, the formation of void, lane, vortex, the non-linear structures such as soliton and shock and the collective modes. In this talk, after a short review of aforementioned physical phenomena, we will present the electromagnetic spectrum of complex plasma in g×B configurations. Focusing on the low frequency dynamics associated with force balanced motions of microparticles, we report on the emergence of stability switching of dust gravitational drift wave at a critical wavenumber and the onset of stationary structure of dust magneto gravitational drift wave at a cut-off wavenumber. The scaling formulas derived for the predicted threshold phenomena can be used as an alternative tool for complex plasma diagnostics. These scenarios are expected to be observed in fully magnetized dusty plasma experiments as the next frontier for complex plasma research.