Issue |
E3S Web Conf.
Volume 632, 2025
The 5th Edition of Oriental Days for the Environment “Green Lab. Solution for Sustainable Development” (JOE5)
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Article Number | 04001 | |
Number of page(s) | 12 | |
Section | Renewable Energies & Circular Economy | |
DOI | https://doi.org/10.1051/e3sconf/202563204001 | |
Published online | 03 June 2025 |
Behavior of thermal electropositive plasma near electron emitting surfaces
LPTPME, Department of Physics, Faculty of Sciences, Mohammed First University, Oujda 60000, Morocco
* Corresponding author: a.asserghine@ump.ac.ma
This study investigates the behavior of a thermal plasma sheath comprising positive ions as well as primary electrons in contact with electron-emitting surfaces. The Bohm sheath criterion is found to depend on the parameter of nonextensivity, the temperature ratio of positive ions to primary electrons, the secondary electron emission coefficients for primary electrons and positive ions, as well as the floating potential. Considering both thermal and cold plasma cases with superextensive (q < 1) and extensive (Maxwellian, q = 1) primary electron distributions, the influence of positive ion temperature on sheath properties is numerically examined using the Bohm sheath criterion and the wall potential. A comparative study is also conducted between the results with and without secondary electron emission. Furthermore, it is found that for high-energy primary electrons (superextensive plasma), the presence of secondary electron emission significantly reduces the sheath thickness compared to that in a Maxwellian plasma. This work provides significant insights into plasma- surface interactions which have potential applications in plasma processing technologies and magnetic confinement fusion devices, contributing to the advancement of efficient energy systems.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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