Particle in cell calculation of plasma force on a small grain in a non-uniform collisional sheath
Author(s)Hutchinson, Ian H.
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The plasma force on grains of specified charge and height in a collisional DC plasma sheath is calculated using the multidimensional particle in cell code COPTIC. The background ion velocity distribution functions for the unperturbed sheath vary substantially with collisionality. The grain force is found to agree quite well with a combination of background electric-field force plus ion drag force. However, the drag force must take account of the non-Maxwellian (and spatially varying) ion distribution function, and the collisional drag enhancement. It is shown how to translate the dimensionless results into practical equilibrium including other forces such as gravity.
DepartmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Plasma Physics and Controlled Fusion
Hutchinson, I H. “Particle in Cell Calculation of Plasma Force on a Small Grain in a Non-Uniform Collisional Sheath.” Plasma Physics and Controlled Fusion 55, no. 11 (October 18, 2013): 115014.