Skip to Main content Skip to Navigation
Journal articles

Strongly emissive plasma-facing material under space-charge limited regime: Application to emissive probes

Abstract : A quasi-static theoretical 1D model is developed to describe the sheath structure of a strongly emissive plasma-facing material and is subsequently applied to emissive probes experimental data-which are usually supposed to be an efficient tool to directly measure plasma potential fluctuations. The model is derived following the space-charge limited emission current model developed in [S. Takamura, N. Ohno, M.Y. Ye, and T. Kuwabara. Contribution to Plasma Physics, 44(1-3):126–137, 2004.], adding the contribution of secondary emission due to back-diffusion of plasma electrons at the emitting surface. From this theory, current-voltage characteristics of emissive probes are derived. A theoretical relation between the floating potential of an emissive probe and plasma parameters is obtained and a criterion is derived to determine the threshold between thermoemission limited current regime and space-charge limited current regime. In the space-charge limited regime, a first order expansion is then applied to the quasi-static relation to study the effect of plasma fluctuations on emissive probe measurements. Both the mean values and the fluctuations of the floating potential of an emissive probe predicted by the model, as well as the potential value at which the transition between emission current regimes occurs, are compared to three sets of experimental data obtained in two different plasma devices. 2
Keywords : plasma emissive probe
Document type :
Journal articles
Complete list of metadata

https://hal.univ-lorraine.fr/hal-01576912
Contributor : Nicolas Lemoine <>
Submitted on : Thursday, August 24, 2017 - 12:28:29 PM
Last modification on : Thursday, February 25, 2021 - 11:04:55 AM

File

Thermoemission_v32.pdf
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution - NoDerivatives 4.0 International License

Identifiers

Citation

Jordan Cavalier, Nicolas Lemoine, Guillaume Bousselin, Nicolas Plihon, Jordan Ledig. Strongly emissive plasma-facing material under space-charge limited regime: Application to emissive probes. Physics of Plasmas, American Institute of Physics, 2017, 24 (1), pp.13506 - 13506. ⟨10.1063/1.4973557⟩. ⟨hal-01576912⟩

Share

Metrics

Record views

300

Files downloads

404