Twisted dust-acoustic waves and kinetic instability in a dusty plasma

International conference on Atomic, Nuclear and Plasma Physics

November 19-20, 2018 Sydney, Australia

Shujaht Bukhari

The University of Azad Jammu & Kashmir, Pakistan

Scientific Tracks Abstracts: J Astrophys Aerospace Technol

Abstract :

The kinetic instability of twisted Dust-Acoustic (DA) wave with distinct Orbital Angular Momentum (OAM) states is studied in un-magnetized multi-components dusty plasma. For this purpose, the linearized Vlasov-Poisson equations are solved together by expressing the perturbed distribution function and electrostatic potential in terms of Laguerre-Gauss functions or solutions. A generalized plasma dielectric constant is derived and the existence conditions for damping/growth rates are discussed showing significant modifications in twisted dusty modes as compared to straight propagating modes. The impact of streaming speed and twist parameter are numerically examined on the growth rate instability. It has been found that parametric variation significantly modifies the threshold conditions and associated growth rate instability of twisted DA waves. The relevance of the present results to interstellar dust clouds and in laboratory plasmas is illustrated, where massive dust grains follow a Maxwellian distribution in addition to streaming electrons and non-streaming ions.

Biography :

Shujaht Bukhari has his expertise in the study of “Laser-Plasma Collective Processes” and “Waves and instabilities in Space & Astrophysical Complex Plasmas” with non-planner or helical wavefronts owing to the finite orbital angular momentum states. He supervised many students at BS and MS level programs. Currently he is working in the Department of Physics, University of Azad Jammu and Kashmir.

E-mail: shujaht_physics@yahoo.com