Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak | Zendy

J.C. Hillesheim | Zendy; J. C. DeBoo | Zendy; W. A. Peebles | Zendy; Troy Carter | Zendy; G. Wang | Zendy; T. L. Rhodes | Zendy; L. Schmitz | Zendy; G. R. McKee | Zendy; Z. Yan | Zendy; G. M. Staebler | Zendy; K.H. Burrell | Zendy; E. J. Doyle | Zendy; C. Holland | Zendy; C. C. Petty | Zendy; S. P. Smith | Zendy; A. E. White | Zendy; L. Zeng | Zendy

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Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak

Author(s) -

J.C. Hillesheim,

J. C. DeBoo,

W. A. Peebles,

Troy Carter,

G. Wang,

T. L. Rhodes,

L. Schmitz,

G. R. McKee,

Z. Yan,

G. M. Staebler,

K.H. Burrell,

E. J. Doyle,

C. Holland,

C. C. Petty,

S. P. Smith,

A. E. White,

L. Zeng

Publication year - 2013

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.110.045003

Subject(s) - diii d , tokamak , electron temperature , physics , turbulence , electron , atomic physics , plasma , toroid , heat flux , flux (metallurgy) , materials science , nuclear physics , heat transfer , mechanics , metallurgy

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[subscript T[subscript e]][superscript -1]=|∇T[subscript e]|/T[subscript e] and toroidal rotation were varied, long wavelength (k[subscript θρs]≲0.4) electron temperature fluctuations exhibit a threshold in L[subscript T[subscript e]][superscript -1]: below, they change little; above, they steadily increase. The increase in δT[subscript e]/T[subscript 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[subscript e]-driven trapped electron mode turbulence.United States. Dept. of Energy (Grant DE-FG03-01ER54615)United States. Dept. of Energy (Grant DE-FG02-08ER54984)United States. Dept. of Energy (Grant DE-FC02-04ER54698)United States. Dept. of Energy (Grant DE-FG02-95ER54309)United States. Dept. of Energy (Grant DE-FG02-89ER53296)United States. Dept. of Energy (Grant DE-FG02-08ER54999)United States. Dept. of Energy (Grant DE-FG02-06ER54871)United States. Dept. of Energy (Grant DE-FG02-07ER54917)United States. Dept. of Energy (Grant DE-FC02-93ER54186

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