9:30 AM–12:30 PM, Wednesday, November 14, 2007
Rosen Centre Hotel - Junior Ballroom
Chair: Stanley Kaye, Princeton Plasma Physics Laboratory
Abstract ID: BAPS.2007.DPP.NI1.2
10:00 AM–10:30 AM
A.E. White
(UCLA)
Electron temperature fluctuations have been measured for the
first time in
the core of high-performance, neutral-beam-heated DIII-D plasmas.
Simultaneous local characterization of temperature and density
fluctuations
presents an opportunity to challenge theoretical/simulation
predictions.
Data from long-duration quiescent H-mode plasmas indicate that, at
$r/a$=0.75, \underline {normalized} fluctuation levels are
reduced by a factor of
5 below L-mode levels, with a detectability limit of $\le
$0.25{\%}. In
these QH-mode plasmas, the \underline {absolute} temperature
fluctuation
amplitude is observed to decrease by a factor of 2, correlating with
increasing electron temperatures and improved electron thermal
confinement.
Temperature fluctuation levels and frequency spectra,
$k_{\theta}\rho_{s}\le $0.5, are determined via correlation
electron cyclotron emission
radiometry [1]. In L-mode, temperature fluctuations (20$
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.NI1.2