Edge Radial Electric Field in Positive and Negative Triangularity Plasmas in the TCV Tokamak
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arXiv
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| Format: | Preprint |
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2025
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| author | Rienäcker, S. Hennequin, P. Vermare, L. Honoré, C. Bouffet-Klein, R. Coda, S. Labit, B. Vincent, B. Thome, K. E. Krutkin, O. Balestri, A. Nakeva, Y. team, the TCV |
| author_facet | Rienäcker, S. Hennequin, P. Vermare, L. Honoré, C. Bouffet-Klein, R. Coda, S. Labit, B. Vincent, B. Thome, K. E. Krutkin, O. Balestri, A. Nakeva, Y. team, the TCV |
| contents | We present the first edge $E_r$ measurements in negative triangularity (NT) TCV plasmas. The Doppler backscattering measurements of $v_\perp \approx E_r/B$ reveal a significant impact of triangularity on the $E_r$ well: In Ohmic, NBI, and ECRH heated discharges, the $E_r$ well and associated $E_r \times B$ shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08682 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Edge Radial Electric Field in Positive and Negative Triangularity Plasmas in the TCV Tokamak Rienäcker, S. Hennequin, P. Vermare, L. Honoré, C. Bouffet-Klein, R. Coda, S. Labit, B. Vincent, B. Thome, K. E. Krutkin, O. Balestri, A. Nakeva, Y. team, the TCV Plasma Physics We present the first edge $E_r$ measurements in negative triangularity (NT) TCV plasmas. The Doppler backscattering measurements of $v_\perp \approx E_r/B$ reveal a significant impact of triangularity on the $E_r$ well: In Ohmic, NBI, and ECRH heated discharges, the $E_r$ well and associated $E_r \times B$ shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode. |
| title | Edge Radial Electric Field in Positive and Negative Triangularity Plasmas in the TCV Tokamak |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2507.08682 |