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Abstract
This work uses self-consistent 3D kinetic simulations to quantify and profile currents collected along a Langmuir probe. These results can be used to design optimal probes for a wide range of parameters relevant to the ionosphere, and low density laboratory plasma experiments.
Highlights
Langmuir probes are amongst the most widely used instruments in laboratory and space plasma experiments
Collected current profiles along thin finite-length cylindrical probes have been studied with a particular attention to end effects
Based on kinetic simulation results for the normalized current collected per unit length g(ζ ), as a function of the normalized axial position ζ, it was possible to construct accurate empirical fits involving coefficients that can be interpolated in parameter space, in order to predict magnitudes and profiles of collected currents for arbitrary values ζ, λ, and η within the range of parameters considered
Summary
Langmuir probes are amongst the most widely used instruments in laboratory and space plasma experiments. A currentvoltage characteristic for idealized infinite probes can be derived analytically from orbital motionlimited (OML) theory, which suggests these probes are well suited for electron density measurements [1,8,9]. In order to better understand edge effects, we investigate the attracted-species current per unit length, i(z), as a function of the position z along a thin, cylindrical probe with both ends free. This approach is widely applicable: edge effects are clearly visible on i(z), which can be used to evaluate how long a guard must be in order to mitigate edge effects.
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