Plasma flow and plasma–wall transition in Hall thruster channel
Open accessAbstract
In this paper a model of the quasineutral plasma and the transition between the plasma and the dielectric wall in a Hall thruster channel is developed. The plasma is considered using a two-dimensional hydrodynamic approximation while the sheath in front of the dielectric surface is considered to be one dimensional and collisionless. The dielectric wall effect is taken into account by introducing an effective coefficient of the secondary electron emission (SEE), s. In order to develop a self-consistent model, the boundary parameters at the sheath edge (ion velocity and electric field) are obtained from the two-dimensional plasma bulk model. In the considered condition, i.e., ion temperature much smaller than that of electrons and significant ion acceleration in the axial direction, the presheath scale length becomes comparable to the channel width so that the plasma channel becomes an effective presheath. It is found that the radial ion velocity component at the plasma–sheath interface varies along the thruster channel from about 0.5Cs (Cs is the Bohm velocity) near the anode up to the Bohm velocity near the exit plane dependent on the SEE coefficient. In addition, the secondary electron emission significantly affects the electron temperature distribution along the channel. For instance in the case of s=0.95, the electron temperature peaks at about 16 eV, while in the case of s=0.8 it peaks at about 30 eV. The predicted electron temperature is close to that measured experimentally. The model predictions of the dependence of the current–voltage characteristic of the E×B discharge on the SEE coefficient are found to be consistent with experiment.
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- Authors
- Keidar, M., Boyd, I. D., & Beilis, I. I.
- Affiliations
- University of Michigan (US)
- Tel Aviv University (IL)
- Venue
- Physics of Plasmas
- Publisher
- AIP Publishing
- Published
- 2001-12-01
- Volume
- 8
- Issue
- 12
- Pages
- 5315-5322
- ISSN
- 1070-664X (ISSN-L)
- 1089-7674
- OpenAlex
- W2015072211
- Cited by
- 198
- References
- 26
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 4 · 2023: 1 · 2022: 5 · 2021: 9 · 2020: 4 · 2019: 9 · 2018: 5 · 2017: 10 · 2016: 8 · 2015: 2 · 2014: 3 · 2013: 4 · 2012: 12
- FWCI
- 11.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Physics of Plasmas (publishedVersion)
- Deep Blue (University of Michigan) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Plasma Diagnostics and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Vacuum and Plasma Arcs
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Magnetic confinement fusion research
- Keywords
- Hall thruster, plasma sheath, secondary electron emission, presheath, electron temperature profile, ion velocity, hydrodynamic plasma model, current-voltage characteristics, dielectric walls
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