Record Details


Field	Value

Title	Suppression of first-wall interaction in negative triangularity plasmas on TCV

Identifier	https://doi.org/10.7910/DVN/JOMOQF

Creator	Han, W.; Offeddu, N.; Golfinopoulos, T.; Theiler, C.; Tsui, C.K.; Boedo, J.A.; Marmar, E.S.

Publisher	Harvard Dataverse

Description	Magnetically confined fusion plasmas with negative triangularity (d) exhibit greater L-mode confinement than with positive d. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within the plasma core. We report on fluctuation measurements in the scrape-off layer (SOL) for −0.61 < d < +0.64 in limited and diverted ohmic L-mode plasmas; these reveal a strong reduction in SOL fluctuation amplitudes at d < −0.25, and, surprisingly, an almost full suppression of plasma interaction with the main-chamber first-wall, which could have important implications for the prospects of using negative d plasmas as a reactor solution. An exploration of several physical mechanisms suggests that a reduced connection length—intrinsic to negative d plasmas—plays a critical role in the origin of this phenomenon.

Subject	Physics DIII-D tokamak fluctuation amplitudes l-mode plasmas magnetically confined fusion plasmas physical mechanism plasma core scrape-off layer triangularity plasmas

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