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On thermionic emission from plasma-facing components in tokamak-relevant conditions
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-9632-8104
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2017 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 59, no 9, article id 094002Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. 59, no 9, article id 094002
Keywords [en]
tungsten, tokamak, thermionic emission, plasma facing components, particle-in-cell melting
National Category
Physical Sciences
Identifiers
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
Funder
Swedish Research Council
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2017-08-15Bibliographically approved

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Ratynskaia, SvetlanaTolias, Panagiotis

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