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Title: Grain-grain interaction in stationary dusty plasma

Abstract

We present a particle-in-cell simulation study of the steady-state interaction between two stationary dust grains in uniform stationary plasma. Both the electrostatic force and the shadowing force on the grains are calculated explicitly. The electrostatic force is always repulsive. For two grains of the same size, the electrostatic force is very nearly equal to the shielded electric field due to a single isolated grain, acting on the charge of the other grain. For two grains of unequal size, the electrostatic force on the smaller grain is smaller than the isolated-grain field, and the force on the larger grain is larger than the isolated-grain field. In all cases, the attractive shadowing force exceeds the repulsive electrostatic force when the grain separation d is greater than an equilibrium separation d{sub 0}. d{sub 0} is found to be between 6λ{sub D} and 9λ{sub D} in all cases. The binding energy is estimated to be between 19 eV and 900 eV for various cases.

Authors:
;  [1]
  1. Department of Astronomy, University of Maryland, College Park, Maryland 20740 (United States)
Publication Date:
OSTI Identifier:
22408157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BINDING ENERGY; COMPUTERIZED SIMULATION; DUSTS; ELECTRIC FIELDS; EV RANGE; INTERACTIONS; PARTICLES; PLASMA; STEADY-STATE CONDITIONS

Citation Formats

Lampe, Martin, and Joyce, Glenn. Grain-grain interaction in stationary dusty plasma. United States: N. p., 2015. Web. doi:10.1063/1.4907649.
Lampe, Martin, & Joyce, Glenn. Grain-grain interaction in stationary dusty plasma. United States. doi:10.1063/1.4907649.
Lampe, Martin, and Joyce, Glenn. 2015. "Grain-grain interaction in stationary dusty plasma". United States. doi:10.1063/1.4907649.
@article{osti_22408157,
title = {Grain-grain interaction in stationary dusty plasma},
author = {Lampe, Martin and Joyce, Glenn},
abstractNote = {We present a particle-in-cell simulation study of the steady-state interaction between two stationary dust grains in uniform stationary plasma. Both the electrostatic force and the shadowing force on the grains are calculated explicitly. The electrostatic force is always repulsive. For two grains of the same size, the electrostatic force is very nearly equal to the shielded electric field due to a single isolated grain, acting on the charge of the other grain. For two grains of unequal size, the electrostatic force on the smaller grain is smaller than the isolated-grain field, and the force on the larger grain is larger than the isolated-grain field. In all cases, the attractive shadowing force exceeds the repulsive electrostatic force when the grain separation d is greater than an equilibrium separation d{sub 0}. d{sub 0} is found to be between 6λ{sub D} and 9λ{sub D} in all cases. The binding energy is estimated to be between 19 eV and 900 eV for various cases.},
doi = {10.1063/1.4907649},
journal = {Physics of Plasmas},
number = 2,
volume = 22,
place = {United States},
year = 2015,
month = 2
}
  • We have studied the lattice structure and grain charge of dusty plasma Coulomb crystals formed in rectangular conductive grooves as a function of plasma temperature and density. The crystal appears to be made of mutually repulsive columns of grains confined by the walls of the groove. The columns are oriented along the direction of the electrode sheath electric field. A simple phenomenological model wherein the inter-grain spacing results from an attractive electric field induced dipole-dipole force balanced by a repulsive monopole Coulomb force is consistent with observed features of the Coulomb crystal. {copyright} {ital 1998 American Institute of Physics.}
  • We have studied the lattice structure and grain charge of dusty plasma Coulomb crystals formed in rectangular conductive grooves as a function of plasma temperature and density. The crystal appears to be made of mutually repulsive columns of grains confined by the walls of the groove. The columns are oriented along the direction of the electrode sheath electric field. A simple phenomenological model wherein the inter-grain spacing results from an attractive electric field induced dipole-dipole force balanced by a repulsive monopole Coulomb force is consistent with observed features of the Coulomb crystal.
  • Using the equations of self-consistent charge dynamics for the grain charge fluctuations, electron plasma oscillations in a dusty plasma are studied. It is shown that the instability in longitudinal plasma oscillations disappears if the self-consistent grain charge dyanmics is taken into account. The relation of this result with previous work is discussed. {copyright} {ital 1997} {ital The American Physical Society}
  • Accounting for the lattice discreteness and the sheath electric field nonlinearity in dusty plasma crystals, it is demonstrated that highly localized structures (discrete breathers) involving vertical (transverse, off-plane) oscillations of charged dust grains may exist in a dust lattice. These structures correspond to either extremely localized bright breather excitations (pulses) or dark excitations composed of dips/voids. Explicit criteria for selecting different breather modes are presented.
  • The dynamical charging of dust grains is an important process and is found to enhance the shielding of a test charge passing through a multi-component dusty plasma. In the present work, the energy loss of a test charge projectile passing through a dusty plasma in the presence of dynamical grain charging is studied. The electric forces can be written in terms of the Maxwell stress tensor for a sphere around the test charge. For sphere with radius tending to zero the force is just that on the test charge. For a finite radius, forces on the plasma are also includedmore » which makes it possible to see how the force on the test charge is balanced by the force on the plasma. The method fails for the zero radius but the drag force can be found from a simple physical model. The general analytical results are presented and are compared with the previous results.« less