Heat and particle exhaust in high-performance plasmas in Wendelstein 7-X
| Autor: | Yu Gao, Joachim Geiger, Marcin W. Jakubowski, Arun Pandey, Sergey Bozhenkov, Yuhe Feng, Michael Endler, Jürgen Baldzuhn, Valeria Perseo, Thierry Kremeyer, Georg Schlisio, Aleix Puig Sitjes, Matthias Otte, Dirk Naujoks, Maciej Krychowiak, Ralf König, Daihong Zhang, Tamás Szepesi, Gábor Kocsis, Gábor Cseh, Attila Buzás, Fabio Pisano, Alexander Knieps, the W7-X Team |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Nuclear Fusion, Vol 64, Iss 7, p 076060 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1741-4326 0029-5515 |
| DOI: | 10.1088/1741-4326/ad5364 |
| Popis: | The paper reports for the first time the heat and particle exhaust at the plasma boundary through various edge diagnostics for the high-performance plasma obtained after pellet injection on Wendelstein 7-X. The plasma density at the edge is found to be reduced by a factor of 2 in the high-performance phase, supporting the previously reported density peaking at the plasma centre. The plasma beta effect on the magnetic topology is reflected by the appearance of the second strike line, which is well understood with simulation. However, during the rapid decay phase of the enhanced confinement, a transient localized heat flow of up to 16 MW m ^−2 is observed at the leading edge of a poorly cooled divertor component, which has not been understood but raises concerns about machine safety. |
| Databáze: | Directory of Open Access Journals |
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