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