Eur. Phys. J. AP
Volume 22, Number 1, April 2003
|Page(s)||29 - 39|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||25 February 2003|
A particle-in-cell/Monte Carlo model of the Ar+ ion collection in He gas by a cylindrical Langmuir probe in the transition regime
Dipartimento di Chimica dell'Università and IMIP-CNR, sect. Bari, via Orabona 4,
70126 Bari, Italy
Corresponding author: firstname.lastname@example.org
Revised: 20 December 2002
Accepted: 20 December 2002
Published online: 25 February 2003
This article presents a particle-in-cell (PIC)/test-particle Monte Carlo (TPMC) simulation of the dynamics of Ar+ ions in the region (sheath and presheath) surrounding an attracting cylindrical Langmuir probe at medium He buffer gas pressure. The numerical model is based on a combination of PIC simulation for the ion component and fluid description for the electrons using the Boltzmann relation. The electric field is self-consistently computed via the Poisson equation. The neutrals are modeled directly by an analytical method. The elastic collisions between Ar+ ions and He atoms are accounted for using a TPMC method based on the polarization potential theory. The results of the present simulation are compared with measurements, with other probe theories and the results of other authors simulations.
PACS: 52.65.Rr – Particle-in-cell method / 52.25.Dg – Plasma kinetic equations / 52.40.Hf – Plasma-material interactions; boundary layer effects
© EDP Sciences, 2003
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