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Models for the Collecting Area of Langmuir Probes Comparable to the Ion Larmor Radius

โœ Scribed by D. Desideri; G. Serianni; V. Antoni; M. Bagatin

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
457 KB
Volume
38
Category
Article
ISSN
0005-8025

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โœฆ Synopsis

An analytical model has been developed to estimate the collecting area of a "gapped" single Langmuir probe flush to a local limiter, when the probe characteristic dimension perpendicular to the magnetic field direction is comparable to the ion Larmor radius. The problem has been solved for angles between the magnetic field direction and the probe surface between 12' and 42', and for square and circular probe cross-sections. A numerical model, adopting a Montecarlo type approach, has also been developed in order to generalize the solution. Both models also estimate the dependence of the collecting area on the sheath thickness. The models are in good agreement and have been applied to the probes used on the RFX experiment.

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## Abstract A numerical study is made of the dynamics of Ar^+^ ions collected by a 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.