Nuclear Fusion (Jan 2024)
Heat and particle exhaust in high-performance plasmas in Wendelstein 7-X
- 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
Affiliations
- Yu Gao
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Joachim Geiger
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Marcin W. Jakubowski
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Arun Pandey
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Sergey Bozhenkov
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Yuhe Feng
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Michael Endler
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Jürgen Baldzuhn
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Valeria Perseo
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Thierry Kremeyer
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Georg Schlisio
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Aleix Puig Sitjes
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Matthias Otte
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Dirk Naujoks
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Maciej Krychowiak
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Ralf König
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Daihong Zhang
- ORCiD
- Max-Planck-Institut für Plasmaphysik , 17491 Greifswald, Germany
- Tamás Szepesi
- ORCiD
- Centre for Energy Research , 1121 Budapest, Hungary
- Gábor Kocsis
- Centre for Energy Research , 1121 Budapest, Hungary
- Gábor Cseh
- ORCiD
- Centre for Energy Research , 1121 Budapest, Hungary
- Attila Buzás
- ORCiD
- Centre for Energy Research , 1121 Budapest, Hungary
- Fabio Pisano
- ORCiD
- University of Cagliari, Department of Electrical and Electronic Engineering , 09123 Cagliari, Italy
- Alexander Knieps
- ORCiD
- Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC) , 52425 Jülich, Germany
- the W7-X Team
- DOI
- https://doi.org/10.1088/1741-4326/ad5364
- Journal volume & issue
-
Vol. 64,
no. 7
p. 076060
Abstract
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.
Keywords