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Title: Electromagnetic dust-lower-hybrid and dust-magnetosonic waves and their instabilities in a dusty magnetoplasma

Abstract

The electromagnetic waves below the ion-cyclotron frequency have been examined in a collisionless and homogeneous dusty plasma in the presence of a dust beam parallel to the direction of the external magnetic field. The low-frequency mixed electromagnetic dust-lower-hybrid and purely transverse magnetosonic waves become unstable for the sheared flow of dust grains and grow in amplitude when the drift velocity of the dust grains exceeds the parallel phase velocity of the waves. The growth rate depends dominantly upon the thermal velocity and density of the electrons.

Authors:
; ; ; ; ;  [1];  [2];  [3];  [3];  [4]
  1. Salam Chair, Government College University, Lahore, Pakistan, Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh, and Department of Physics, Government College University, Lahore (Pakistan)
  2. (Bangladesh)
  3. (Pakistan)
  4. (Germany)
Publication Date:
OSTI Identifier:
20860419
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 12; Other Information: DOI: 10.1063/1.2400846; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CYCLOTRON FREQUENCY; DUSTS; ELECTROMAGNETIC RADIATION; ELECTRONS; ION ACOUSTIC WAVES; IONS; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; MAGNETIC FIELDS; MAGNETOACOUSTIC WAVES; MAGNETOHYDRODYNAMICS; PHASE VELOCITY; PLASMA; PLASMA DENSITY; PLASMA INSTABILITY; RADIATION TRANSPORT; SHEAR

Citation Formats

Salimullah, M., Rahman, M. M., Zeba, I., Shah, H. A., Murtaza, G., Shukla, P. K., Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Department of Physics, Government College University, Lahore, Salam Chair, Government College University, Lahore, and Institut fuer Theoretische Physik IV, Ruhr-Universitaet Bochum, D-44780, Bochum. Electromagnetic dust-lower-hybrid and dust-magnetosonic waves and their instabilities in a dusty magnetoplasma. United States: N. p., 2006. Web. doi:10.1063/1.2400846.
Salimullah, M., Rahman, M. M., Zeba, I., Shah, H. A., Murtaza, G., Shukla, P. K., Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Department of Physics, Government College University, Lahore, Salam Chair, Government College University, Lahore, & Institut fuer Theoretische Physik IV, Ruhr-Universitaet Bochum, D-44780, Bochum. Electromagnetic dust-lower-hybrid and dust-magnetosonic waves and their instabilities in a dusty magnetoplasma. United States. doi:10.1063/1.2400846.
Salimullah, M., Rahman, M. M., Zeba, I., Shah, H. A., Murtaza, G., Shukla, P. K., Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Department of Physics, Government College University, Lahore, Salam Chair, Government College University, Lahore, and Institut fuer Theoretische Physik IV, Ruhr-Universitaet Bochum, D-44780, Bochum. Fri . "Electromagnetic dust-lower-hybrid and dust-magnetosonic waves and their instabilities in a dusty magnetoplasma". United States. doi:10.1063/1.2400846.
@article{osti_20860419,
title = {Electromagnetic dust-lower-hybrid and dust-magnetosonic waves and their instabilities in a dusty magnetoplasma},
author = {Salimullah, M. and Rahman, M. M. and Zeba, I. and Shah, H. A. and Murtaza, G. and Shukla, P. K. and Department of Physics, Jahangirnagar University, Savar, Dhaka-1342 and Department of Physics, Government College University, Lahore and Salam Chair, Government College University, Lahore and Institut fuer Theoretische Physik IV, Ruhr-Universitaet Bochum, D-44780, Bochum},
abstractNote = {The electromagnetic waves below the ion-cyclotron frequency have been examined in a collisionless and homogeneous dusty plasma in the presence of a dust beam parallel to the direction of the external magnetic field. The low-frequency mixed electromagnetic dust-lower-hybrid and purely transverse magnetosonic waves become unstable for the sheared flow of dust grains and grow in amplitude when the drift velocity of the dust grains exceeds the parallel phase velocity of the waves. The growth rate depends dominantly upon the thermal velocity and density of the electrons.},
doi = {10.1063/1.2400846},
journal = {Physics of Plasmas},
number = 12,
volume = 13,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • Kinetic Alfven waves with finite Larmor radius effects have been examined rigorously in a uniform dusty plasma in the presence of an external/ambient magnetic field. Two-potential theory has been applied for these electromagnetic waves and the dispersion relation is derived which shows a cutoff frequency at the dust-lower-hybrid frequency due to the hybrid motion of magnetized ions and cold and unmagnetized dust dynamics. The dust charge fluctuation effect was analyzed for finding the damping of the electromagnetic kinetic Alfven waves, which arises on account of the electrostatic parallel component of the waves. The dust charge fluctuation damping is seen tomore » be contributed dominantly by the perpendicular motion of electrons and ions in the dusty magnetoplasma.« less
  • A rigorous theoretical investigation is made for the low frequency electrostatic waves in a cylindrically bounded magnetized dusty plasmas with nonadiabatic dust charge variation, and the dispersion relation for the low frequency modes is derived. The combined effects of the cylindrical boundary, the external magnetized field, the nonadiabatic dust charge fluctuation, the nonthermally distributed ions and the ratio of electron to ion density on the low frequency waves are studied in great detail. It is shown that the mentioned effects have a strong influence on the dispersion properties of the low frequency modes.
  • Current drive by fast magnetosonic waves is successfully performed in the JIPP T-IIU tokamak by means of a four-element dipole antenna array with a Faraday shield. A plasma current of about 50 kA is sustained by an RF power of about 80 kW in a low-density plasma (3 x 10/sup 12/ cm/sup -3/) with an efficiency comparable to that of slow wave current drive. A density limit for fast magnetosonic current drive is observed contrary to theoretical expectations based on linear wave propagation.
  • A theoretical investigation has shown that energy could be fed into a microturbulence from an externally excited low frequency magneto-acoustic source. A magnetosonic wave, normally undamped in a quiescent plasma, is shown to be damped in the presence of a lower hybrid microturbulence which in turn effectively heats the plasma ions. This process does not require any threshold amplitude of the external pump wave and therefore, very small amplitude waves can deposit their energy into the plasma unlike the usual parametric heating schemes which demand a minimum threshold amplitude.
  • We investigated linear and nonlinear properties of electromagnetic ion-temperature-gradient driven mode for a dissipative, nonuniform dust-contaminated electron-ion plasma with sheared ion flows. In the linear limit, a new dispersion relation has been derived and several interesting limiting cases are also discussed. On the other hand, in the nonlinear case, by ignoring dissipative effects, the nonlinear set of equations admits a dipolar vortex type solution. The results of the present investigation should be helpful to understand some linear as well as nonlinear properties of magnetically confined dust-contaminated tokamak edge plasmas.