Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission
Abstract
A new model describing dust charging and heating in unmagnetized plasmas in the presence of large electron emission currents is presented. By accounting for the formation of a potential well due to trapped emitted electrons when the dust is positively charged, this model extends the so-called OML+ approach, thus far limited to thermionic emission, by including electron-induced emission processes, and in particular low-energy quasi-elastic electron reflection. Revised semi-analytical formulas for the current and heat fluxes associated with emitted electrons are successfully validated against particle-in-cell simulations and predict an overall reduction of dust heating by up to a factor of 2. Finally, when applied to tungsten dust heating in divertor-like plasmas, the new model predicts that the dust lifetime increases by up to 80%, as compared with standard orbital-motion-limited estimates.
- Authors:
-
[1];
- KTH Royal Inst. of Technology, Stockholm (Sweden). Space and Plasma Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); USDOE
- OSTI Identifier:
- 1481988
- Alternate Identifier(s):
- OSTI ID: 1454349
- Report Number(s):
- LA-UR-18-21064
Journal ID: ISSN 1070-664X
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Fusion Energy
Citation Formats
Vignitchouk, L., Delzanno, G. L., Tolias, P., and Ratynskaia, S. Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission. United States: N. p., 2018.
Web. doi:10.1063/1.5026384.
Vignitchouk, L., Delzanno, G. L., Tolias, P., & Ratynskaia, S. Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission. United States. https://doi.org/10.1063/1.5026384
Vignitchouk, L., Delzanno, G. L., Tolias, P., and Ratynskaia, S. Wed .
"Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission". United States. https://doi.org/10.1063/1.5026384. https://www.osti.gov/servlets/purl/1481988.
@article{osti_1481988,
title = {Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission},
author = {Vignitchouk, L. and Delzanno, G. L. and Tolias, P. and Ratynskaia, S.},
abstractNote = {A new model describing dust charging and heating in unmagnetized plasmas in the presence of large electron emission currents is presented. By accounting for the formation of a potential well due to trapped emitted electrons when the dust is positively charged, this model extends the so-called OML+ approach, thus far limited to thermionic emission, by including electron-induced emission processes, and in particular low-energy quasi-elastic electron reflection. Revised semi-analytical formulas for the current and heat fluxes associated with emitted electrons are successfully validated against particle-in-cell simulations and predict an overall reduction of dust heating by up to a factor of 2. Finally, when applied to tungsten dust heating in divertor-like plasmas, the new model predicts that the dust lifetime increases by up to 80%, as compared with standard orbital-motion-limited estimates.},
doi = {10.1063/1.5026384},
journal = {Physics of Plasmas},
number = 6,
volume = 25,
place = {United States},
year = {Wed Jun 13 00:00:00 EDT 2018},
month = {Wed Jun 13 00:00:00 EDT 2018}
}
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Figures / Tables:
FIG. 1: Critical thermionic current $\hat I^{∗}_{th}$ required to reach zero dust charge in presence of quasi-elastic electron reflection, as a function of the dust temperature $T$d. The critical current is expressed as a fraction the corresponding OML value at zero yield, which is obtained by setting $φ$d = 0more »
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Works referencing / citing this record:
Validating heat balance models for tungsten dust in cold dense plasmas
journal, September 2018
- Vignitchouk, L.; Ratynskaia, S.; Kantor, M.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 11
Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.