Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas |
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| Authors: | Schmitz L White A E Carter T A Peebles W A Rhodes T L Burrell K H Solomon W Staebler G M |
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| Institution: | Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, CA 90024-2704, USA. |
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| Abstract: | Core electron-temperature fluctuations 0.5%< or =Tover ]_(e)/T_(e)< or =2%, k_(theta)rho_(s)< or =0.3 in neutral-beam-heated low confinement-mode (L-mode) plasmas] are observed to decrease by at least a factor of 4 in standard and quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-D tokamak (r/a=0.7). These fluctuations are attributed to ion temperature gradient (ITG) modes stabilized by rotational shear at the H-mode transition. The simultaneous reduction in electron heat diffusivity (chi_(e)(QH)/chi_(e)(L)<0.25) suggests that Tover ]_(e) fluctuations can contribute significantly to L-mode electron heat transport. |
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