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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:"Reduction of Core Turbulence in I-mode Plasmas in Alcator C-Mod"
DTSTART:20130121T103000
DTEND:20130121T113000
DTSTAMP:20260916T010849Z
UID:1b82332ed4ee8ed28d28e4e62a95177f88180a77238aad34e58aa127
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. A.E. White\, Plasma Science and Fusion Center\, Alcator 
 C-Mod Team\, MIT\, Cambridge\, USA\nIn this talk\, recent observations of 
 reduced core fluctuations in the ELM-free high confinement regime\, I-mode
 \, at Alcator C-Mod [E.S. Marmar\, et al. Nuclear Fusion\, 49(10):104014\,
  2009] will be presented. Measurements of core and edge electron temperatu
 re fluctuations are possible using C-Mod’s ECE systems\, including a new
 ly installed Correlation ECE diagnostic. Both long wavelength (kθρs < 0.
 5) density and electron temperature fluctuation levels decrease from L-mod
 e levels by up to 30%-50% in I-mode. The reduction in core turbulence is c
 orrelated with increases in confinement in I-mode compared to L-mode. Core
  density fluctuations (ρ < 0.8) are reduced prior to the onset of the edg
 e-localized (0.95 < ρ < 1.0) weakly coherent mode (WCM) and prior to the 
 reduction of low-frequency edge turbulence during I-mode. This result has 
 significant implications for our understanding of the dynamics of confinem
 ent transitions such as I-mode and H-mode\, where changes in edge turbulen
 ce are typically observed to occur prior to changes in core turbulence.
LOCATION:PPB 019
STATUS:CONFIRMED
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