Observation of a critical gradient threshold for electron temperature fluctuations in the DIII-D Tokamak.
Phys Rev Lett
; 110(4): 045003, 2013 Jan 25.
Article
em En
| MEDLINE
| ID: mdl-25166172
ABSTRACT
A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L(T(e))(-1) = |∇T(e)|/T(e) and toroidal rotation were varied, long wavelength (k(θ)ρ(s) â² 0.4) electron temperature fluctuations exhibit a threshold in L(T(e))(-1) below, they change little; above, they steadily increase. The increase in δT(e)/T(e) is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T(e)-driven trapped electron mode turbulence.
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MEDLINE
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En
Revista:
Phys Rev Lett
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos