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Electron reflection...
Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission
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- Vignitchouk, Ladislas (författare)
- KTH,Rymd- och plasmafysik
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- Delzanno, G. L. (författare)
- Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA.
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- Tolias, Panagiotis, 1984- (författare)
- KTH,Rymd- och plasmafysik
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- Ratynskaia, Svetlana V. (författare)
- KTH,Rymd- och plasmafysik
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(creator_code:org_t)
- AMER INST PHYSICS, 2018
- 2018
- Engelska.
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Ingår i: Physics of Plasmas. - : AMER INST PHYSICS. - 1070-664X .- 1089-7674. ; 25:6
- Relaterad länk:
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https://www.osti.gov...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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. 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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