Collision and recombination driven instabilities in variable charged dusty plasmas
- PDF / 706,587 Bytes
- 22 Pages / 510.236 x 680.315 pts Page_size
- 0 Downloads / 179 Views
c Indian Academy of Sciences
— journal of physics
Vol. 80, No. 4 April 2013 pp. 643–664
Collision and recombination driven instabilities in variable charged dusty plasmas S BAL1,2 and M BOSE1,∗ 1 Department
of Physics, Jadavpur University, Kolkata 700 032, India of AEIE, Dream Institute of Technology, Kolkata, India ∗ Corresponding author. E-mail: [email protected] 2 Department
MS received 15 February 2012; accepted 12 October 2012 Abstract. The dust-acoustic instability driven by recombination of electrons and ions on the surface of charged and variably-charged dust grains as well as by collisions in dusty plasmas with significant pressure of background neutrals have been theoretically investigated. The recombination driven instability is shown to be dominant in the long wavelength regime even in the presence of dust-neutral and ion-neutral collisions, while in the shorter wavelength regime, the dust-neutral collision is found to play a major role. In an earlier research work, the dust-neutral collision was neglected in comparison to the effect due to the recombination for estimating the dust-acoustic instability; later the other report shows that the recombination effect is negligible in the presence of dust-neutral collisions. In line of this present situation our investigation revealed that the recombination is more important than dust-neutral collisions in laboratory plasma and fusion plasma, while the dust-neutral collision frequency is dominant in the interstellar plasmas. The effects of ion and dust densities and ion streaming on the recombination and collision driven mode in parameter regimes relevant for many experimental studies on dusty plasmas have also been calculated. Keywords. Dusty plasma; recombination; dust-neutral collision. PACS Nos 52.25.Vy; 52.27.Lw; 52.35.–g; 52.35.Fp; 52.35.Qz; 52.20.Hv
1. Introduction Dusty plasma is loosely defined as normal electron–ion plasma with an additional charged component of micron or submicron-sized particulates. This extra component of macroparticles increases the complexity of the system even further. Dusty plasmas have acquired considerable importance because of their presence in controlled fusion devices [1], astrophysics and planetary physics [2], problems of plasma processing [3], physics of strongly coupled systems [4] etc. Experimentally, one of the important areas of investigation is the study of low-frequency fluctuations in plasma with dust grains. Barkan et al [5] has shown that the phase velocity of an ion-acoustic wave increases with the density of negatively charged dust grains and thus ion Landau damping becomes less severe in plasma DOI: 10.1007/s12043-013-0511-x; ePublication: 27 March 2013
643
S Bal and M Bose with charged dust grains or negative ions [6]. The massive dust grains in the plasma collect electrons and ions from the background plasma thereby acquiring a large electric discharge. The dynamics of these massive particles introduces a variety of new collective wave modes. The study of damping and instability mechanisms
Data Loading...
