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Hillesheim, J C; DeBoo, J C; Peebles, W A; Carter, T A; Wang, G; Rhodes, T L; Schmitz, L; McKee, G R; Yan, Z; Staebler, G M; Burrell, K H; Doyle, E J; Holland, C; Petty, C C; Smith, S P; White, A E; Zeng, L
Physical review letters, 01/2013, Letnik: 110, Številka: 4Journal Article
A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L(T(e))(-1) = |∇T(e)|/T(e) and toroidal rotation were varied, long wavelength (k(θ)ρ(s) ≲ 0.4) electron temperature fluctuations exhibit a threshold in L(T(e))(-1): below, they change little; above, they steadily increase. The increase in δT(e)/T(e) is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T(e)-driven trapped electron mode turbulence.
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