Phys. Rev. Lett. 100, 035002 (2008) [4 pages]Observation of Reduced Electron-Temperature Fluctuations in the Core of H-Mode PlasmasReceived 9 October 2007; published 23 January 2008 Core electron-temperature fluctuations [0.5%≤T˜e/Te≤2%, kθρs≤0.3 in neutral-beam-heated low confinement-mode(L-mode) plasmas] are observed to decrease by at least a factor of 4 in standardand quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-Dtokamak (r/a=0.7). These fluctuations areattributed to ion temperature gradient (ITG) modes stabilized by rotationalshear at the H-mode transition. The simultaneous reduction in electron heatdiffusivity (χeQH/χeL<0.25)suggests that T˜e fluctuations can contribute significantly to L-mode electron heattransport. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.035002
DOI:
10.1103/PhysRevLett.100.035002
PACS:
52.55.Fa, 52.25.Fi, 52.35.Ra, 52.70.Gw
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