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Electron reflection...
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Vignitchouk, LadislasKTH,Rymd- och plasmafysik
(författare)
Electron reflection effects on particle and heat fluxes to positively charged dust subject to strong electron emission
- Artikel/kapitelEngelska2018
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AMER INST PHYSICS,2018
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-232414
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232414URI
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https://doi.org/10.1063/1.5026384DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20180726
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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 och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Delzanno, G. L.Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA.
(författare)
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Tolias, Panagiotis,1984-KTH,Rymd- och plasmafysik(Swepub:kth)u1p3186s
(författare)
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Ratynskaia, Svetlana V.KTH,Rymd- och plasmafysik(Swepub:kth)u1p4172h
(författare)
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KTHRymd- och plasmafysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Physics of Plasmas: AMER INST PHYSICS25:61070-664X1089-7674
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