Bibliographic Details
| Title: |
Enhanced transport at high plasma pressure and sub-threshold kinetic ballooning modes in Wendelstein 7-X |
| Authors: |
Mulholland, P., Aleynikova, K., Faber, B. J., Pueschel, M. J., Proll, J. H. E., Hegna, C. C., Terry, P. W., Nührenberg, C. |
| Publication Year: |
2023 |
| Collection: |
Physics (Other) |
| Subject Terms: |
Physics - Plasma Physics |
| More Details: |
High-performance fusion plasmas, requiring high pressure $\beta$, are not well-understood in stellarator-type experiments. Here, the effect of $\beta$ 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.
Comment: 16 pages, 5 figures |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2306.03694 |
| Accession Number: |
edsarx.2306.03694 |
| Database: |
arXiv |
