Abstract
A large number of new physical processes related to the presence of charged dust grains in a plasma have been discovered both theoretically and in experiments. The dynamics of the charging of the grains adds a new degree of complexity to the physics of these dusty plasmas. New phenomena such as damping due to the phase shift between a plasma wave and the dust charge have been found. The response of a plasma to a moving test charge reveals many characteristic aspects of collective effects, such as charge shielding, the excitation of dispersive waves and the formation of wave fronts. The effect of even a slow test charge velocity is significant. The exponential shielding, which limits the influence of a stationary charge to a few Debye lengths, is modified so that there is a potential disturbance with an asymptotic power law dependence. Here we include the influence of grain charging in the plasma dielectric function. A standard description of the charging dynamics is used. Improved models would lead to more realistic forms of the dielectric function, that could be directly incorporated in our analysis. We find analytical expressions for the potential structure using a power series expansion in the test
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Raadu, Michael A;
Shafiq, M
[1]
- Alfven Laboratory, Royal Institute of Technology, SE-100 44, Stockholm (Sweden)
Citation Formats
Raadu, Michael A, and Shafiq, M.
Effect of grain charging dynamics on the response of a dusty plasma to a moving test charge.
United States: N. p.,
2002.
Web.
doi:10.1063/1.1527816.
Raadu, Michael A, & Shafiq, M.
Effect of grain charging dynamics on the response of a dusty plasma to a moving test charge.
United States.
https://doi.org/10.1063/1.1527816
Raadu, Michael A, and Shafiq, M.
2002.
"Effect of grain charging dynamics on the response of a dusty plasma to a moving test charge."
United States.
https://doi.org/10.1063/1.1527816.
@misc{etde_20621182,
title = {Effect of grain charging dynamics on the response of a dusty plasma to a moving test charge}
author = {Raadu, Michael A, and Shafiq, M}
abstractNote = {A large number of new physical processes related to the presence of charged dust grains in a plasma have been discovered both theoretically and in experiments. The dynamics of the charging of the grains adds a new degree of complexity to the physics of these dusty plasmas. New phenomena such as damping due to the phase shift between a plasma wave and the dust charge have been found. The response of a plasma to a moving test charge reveals many characteristic aspects of collective effects, such as charge shielding, the excitation of dispersive waves and the formation of wave fronts. The effect of even a slow test charge velocity is significant. The exponential shielding, which limits the influence of a stationary charge to a few Debye lengths, is modified so that there is a potential disturbance with an asymptotic power law dependence. Here we include the influence of grain charging in the plasma dielectric function. A standard description of the charging dynamics is used. Improved models would lead to more realistic forms of the dielectric function, that could be directly incorporated in our analysis. We find analytical expressions for the potential structure using a power series expansion in the test particle velocity. The modifications to the potential are clearly evident from extra terms which depend on the parameters for the dust charging. Experimentally, the form of the potential could therefore be used to diagnose the charging dynamics and as an indirect test of the model.}
doi = {10.1063/1.1527816}
journal = []
issue = {1}
volume = {649}
journal type = {AC}
place = {United States}
year = {2002}
month = {Dec}
}
title = {Effect of grain charging dynamics on the response of a dusty plasma to a moving test charge}
author = {Raadu, Michael A, and Shafiq, M}
abstractNote = {A large number of new physical processes related to the presence of charged dust grains in a plasma have been discovered both theoretically and in experiments. The dynamics of the charging of the grains adds a new degree of complexity to the physics of these dusty plasmas. New phenomena such as damping due to the phase shift between a plasma wave and the dust charge have been found. The response of a plasma to a moving test charge reveals many characteristic aspects of collective effects, such as charge shielding, the excitation of dispersive waves and the formation of wave fronts. The effect of even a slow test charge velocity is significant. The exponential shielding, which limits the influence of a stationary charge to a few Debye lengths, is modified so that there is a potential disturbance with an asymptotic power law dependence. Here we include the influence of grain charging in the plasma dielectric function. A standard description of the charging dynamics is used. Improved models would lead to more realistic forms of the dielectric function, that could be directly incorporated in our analysis. We find analytical expressions for the potential structure using a power series expansion in the test particle velocity. The modifications to the potential are clearly evident from extra terms which depend on the parameters for the dust charging. Experimentally, the form of the potential could therefore be used to diagnose the charging dynamics and as an indirect test of the model.}
doi = {10.1063/1.1527816}
journal = []
issue = {1}
volume = {649}
journal type = {AC}
place = {United States}
year = {2002}
month = {Dec}
}