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Enhanced transport at high plasma pressure and subthreshold kinetic ballooning modes in Wendelstein 7-X
| Label | Value |
|---|---|
| Author | |
| Abstract |
High-performance fusion plasmas, requiring high pressure B, are not well-understood in stellarator-type experiments. Here, the effect of B on ion-temperature-gradient-driven (ITG) turbulence is studied in Wendelstein 7-X (W7-X), showing that subdominant kinetic ballooning modes (KBMs) are unstable well below the ideal MHD threshold and get strongly excited in the turbulence. By zonal-flow erosion, these sub-threshold KBMs (stKBMs) affect ITG saturation and enable higher heat fluxes. Controlling stKBMs will be essential to allow W7-X and future stellarators to achieve maximum performance. |
| Year of Publication |
2023
|
| Journal |
Physical Review Letters
|
| Volume |
131
|
| Issue |
18
|
| Number of Pages |
185101
|
| Date Published |
11/2023
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| Publisher |
American Physical Society
|
| URL | |
| DOI | |
| PId |
db519aa5e41c2820d32e3f7e7ef21a31
|
| Alternate Journal |
Phys. Rev. Lett.
|
| Label |
OA
|
Journal Article
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|
| Download citation |
Citation
Mulholland, P., Aleynikova, K., Faber, B. J., Pueschel, M., Proll, J. H., Hegna, C. C., … Nührenberg, C. (2023). Enhanced transport at high plasma pressure and subthreshold kinetic ballooning modes in Wendelstein 7-X. Physical Review Letters, 131(18), 185101. https://doi.org/10.1103/PhysRevLett.131.185101 (Original work published 2023)