Space-charge limited thermionic sheaths in magnetized fusion plasmas

0531218 - ÚFP 2021 RIV AT eng J - Journal Article
Komm, Michael - Ratynskaia, S. - Tolias, P. - Podolník, Aleš
Space-charge limited thermionic sheaths in magnetized fusion plasmas.
Nuclear Fusion. Roč. 60, č. 5 (2020), č. článku 054002. ISSN 0029-5515. E-ISSN 1741-4326
R&D Projects: GA MŠMT(CZ) EF16_013/0001551
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : tungsten * space-charge limitation * particle-in-cell
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.179, year: 2020
Method of publishing: Open access
https://iopscience.iop.org/article/10.1088/1741-4326/ab7c27/pdf

A systematic particle-in-cell investigation is reported focusing on the sheaths surrounding hot planar surfaces that are embedded in fusion plasmas with an arbitrary magnetic field inclination angle. The transition to the space-charge limited regime and the subsequent strict limitation of the escaping thermionic current density are demonstrated to be global characteristics of strongly emitting sheaths also in the presence of inclined magnetic fields. A physically transparent semi-empirical expression has been identified for the limited thermionic current as a function of the plasma conditions and inclination angle that is accurate for both the inter-And intra-ELM plasmas of present-day tokamaks.
Permanent Link: http://hdl.handle.net/11104/0309929