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Title: Grain in weakly ionized plasma in the presence of an external magnetic field: Charging by plasma currents and effective potential

The problem of grain screening is solved numerically for the case of weakly ionized plasma in the presence of an external magnetic field. The plasma dynamics is described within the drift-diffusion approximation under the assumption that the grain absorbs all encountered electrons and ions. We also assume that the plasma current through the grain surface is equal to zero in the stationary state. This condition is used to perform self-consistent calculations of the grain charge. The spatial distribution of the screened grain potential is studied and compared with the analytical estimates. It is shown that at the distances larger than the Debye length such potential has the Coulomb-like asymptotics with the effective charge dependent on the angle between the radius vector and the external magnetic field direction. The numerical solutions show that in the direction parallel to the external magnetic field the effective potential can have nonmonotonic behavior.
Authors:
 [1] ;  [2]
  1. Faculty of Physics, Taras Shevchenko National University of Kyiv, 64, Volodymyrs'ka St., Kyiv 01601 (Ukraine)
  2. (Ukraine)
Publication Date:
OSTI Identifier:
22227993
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 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; APPROXIMATIONS; ASYMPTOTIC SOLUTIONS; COMPARATIVE EVALUATIONS; DEBYE LENGTH; EFFECTIVE CHARGE; ELECTRIC CURRENTS; ELECTRONS; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; NUMERICAL ANALYSIS; NUMERICAL SOLUTION; PLASMA; PLASMA DRIFT; PLASMA POTENTIAL; SPATIAL DISTRIBUTION