Ion velocity distributions in the sheath and presheath of a biased object in plasma

Miloch, W. J.; Gulbrandsen, N.; Mishra, L. N.; Fredriksen, Å.
August 2011
Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p083502
Academic Journal
Ion velocity distributions in the vicinity of a spherical object with a negative potential with respect to collisionless, source-free plasma are studied with three-dimensional numerical simulations. The ion dynamics around the object leads to distorted radial velocity distributions in the presheath and the sheath edge region. Far in the sheath, an increase in the thermal velocity in the radial direction is observed. Different potentials of the object, ion temperatures, and ion masses are considered, as well as the role of spatial and temporal resolutions in laboratory measurements of ion velocity distributions. The simulations are carried out with the DiP3D, a three-dimensional particle-in-cell numerical code.


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