Possibility of weakly charged nonlinear solitary dust clouds near the continuum threshold of dust population in a quasi-neutral dusty plasma |
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Authors: | S K Baishya Joyanti Chutia M K Kalita G C Das C B Dwivedi |
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Institution: | (1) Institute of Advanced Study in Science and Technology, Khanapara, 781 022 Guwahati, India;(2) Department of Physics, Cotton College, 781 001 Guwahati, India |
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Abstract: | Considering the Boltzmann response of the plasma ions and electrons and inertial dynamics of the charged dust grains, the
possibility of very weak compressive soliton near the continuum limit of the dust population has been inferred. It is concluded
that the behaviour of such coherent structures could be well described by the numerical analysis of the derived nonlinear
classical energy integral equation for bounded solutions. These seem to be higher order dispersive structures within acoustic
limit of the nonlinear turbulence. It is observed that the dust density enhancement beyond the continuum threshold causes
regular increment in width and amplitude of the soliton structures. It is found that the soliton amplitude sensitively depends
on the massive impurity’s population. These coherent structures could be visualized as weakly charged solitary dust clouds
of finite extension (∼ plasma Debye length) within Boltzmann environment of plasma particles in their local surroundings.
The seeding mechanism of such clouds may be attributed to some plasma instabilities driven by either internal or external
free energy sources. Numerical analysis of the problem concludes that the experimental observations of such clouds could be
possible in low density plasma regime. It is deduced that for plasma density ∼ 106 cm-3 at temperatures of a few electron volts and for micron to l0nm sized dust grains, the observation of such structures could
be possible within wide range variability of the dust population density. |
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Keywords: | Dusty plasmas soliton dust grains solitary dust clouds colloidal suspension coherent structures |
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