Reduction of core turbulence in I-mode plasmas in Alcator C-Mod

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In this paper, we report observations of reduced core (0.40 < rho < 0.95) fluctuations in the edge localized mode (ELM)free high-confinement regime, I-mode, at Alcator C-Mod (Marmar et al 2009 Nucl. Fusion 49 104014). Long wavelength (k(theta)rho(s) < 0.5) density fluctuation levels are observed to decrease from L-mode levels by up to 30% in I-mode, while long wavelength (k(theta)rho(s) < 0.3) electron temperature fluctuation levels are observed to decrease by up to 70% in I-mode. This reduction in core turbulence is correlated with the increases in confinement in I-mode compared to L-mode. As the pedestal temperature increases across the L-I transition, core density fluctuations (0.40 < rho < 0.95) are reduced prior to the onset of the edge-localized (rho similar to 0.99-1.0) weakly coherent mode (WCM) and prior to the reduction of low-frequency (rho similar to 0.99-1.0) turbulence in the edge/pedestal region. This result helps add to our understanding of the dynamics of confinement transitions such as I-mode and H-mode, where changes in edge turbulence are more typically observed to occur prior to changes in core turbulence.
Publisher
IOP PUBLISHING LTD
Issue Date
2014-08
Language
English
Article Type
Article
Citation

NUCLEAR FUSION, v.54, no.8

ISSN
0029-5515
DOI
10.1088/0029-5515/54/8/083019
URI
http://hdl.handle.net/10203/272846
Appears in Collection
NE-Journal Papers(저널논문)
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