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On thermionic emission from plasma-facing components in tokamak-relevant conditions
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0002-6712-3625
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0001-9632-8104
Vise andre og tillknytning
2017 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 59, nr 9, artikkel-id 094002Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The first results of particle-in-cell simulations of the electrostatic sheath and magnetic pre-sheath of thermionically emitting planar tungsten surfaces in fusion plasmas are presented. Plasma conditions during edge localized modes (ELMs) and during inter-ELM periods have been considered for various inclinations of the magnetic field and for selected surface temperatures. All runs have been performed under two assumptions for the sheath potential drop; fixed or floating. The primary focus lies on the evaluation of the escaping thermionic current and the quantification of the suppression due to the combined effects of space-charge and Larmor gyration. When applicable, the results are compared with the predictions of analytical models. The heat balance in the presence of thermionic emission as well as the contribution of the escaping thermionic current to surface cooling are also investigated. Regimes are identified where emission needs to be considered in the energy budget.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2017. Vol. 59, nr 9, artikkel-id 094002
Emneord [en]
tungsten, tokamak, thermionic emission, plasma facing components, particle-in-cell melting
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-211586DOI: 10.1088/1361-6587/aa78c4ISI: 000405563900001Scopus ID: 2-s2.0-85026767447OAI: oai:DiVA.org:kth-211586DiVA, id: diva2:1133391
Forskningsfinansiär
Swedish Research Council
Merknad

QC 20170815

Tilgjengelig fra: 2017-08-15 Laget: 2017-08-15 Sist oppdatert: 2017-08-15bibliografisk kontrollert

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