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Edge Radial Electric Field in Positive and Negative Triangularity Plasmas in the TCV Tokamak

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arxiv 2507.08682 v1 pith:4YFJG5KO submitted 2025-07-11 physics.plasm-ph

Edge Radial Electric Field in Positive and Negative Triangularity Plasmas in the TCV Tokamak

S. Rien\"acker , P. Hennequin , L. Vermare , C. Honor\'e , R. Bouffet-Klein , S. Coda , B. Labit , B. Vincent
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K.E. Thome O. Krutkin A. Balestri Y. Nakeva the TCV team
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classification physics.plasm-ph
keywords triangularityplasmasedgemeasurementsnegativepositivewellapprox
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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.

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