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A particle-in-cell/Monte Carlo model of the Ar+ ioncollection in He gas by a cylindrical Langmuir probe in the transition regime

Published online by Cambridge University Press:  25 February 2003

F. Taccogna ,
S. Longo  and
M. Capitelli
F. Taccogna*
Affiliation:
Dipartimento di Chimica dell'Università and IMIP-CNR, sect. Bari, via Orabona 4, 70126 Bari, Italy
S. Longo
Affiliation:
Dipartimento di Chimica dell'Università and IMIP-CNR, sect. Bari, via Orabona 4, 70126 Bari, Italy
M. Capitelli
Affiliation:
Dipartimento di Chimica dell'Università and IMIP-CNR, sect. Bari, via Orabona 4, 70126 Bari, Italy
*
[email protected]
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Abstract

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.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 22 , Issue 1 , April 2003 , pp. 29 - 39
Copyright
© EDP Sciences, 2003

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