Detection of zero-mean-frequency zonal flows in the core of a high-temperature tokamak plasma

D. K. Gupta; R. J. Fonck; G. R. McKee; D. J. Schlossberg; M. W. Shafer

doi:10.1103/PhysRevLett.97.125002

Detection of zero-mean-frequency zonal flows in the core of a high-temperature tokamak plasma

D. K. Gupta, R. J. Fonck, G. R. McKee, D. J. Schlossberg, M. W. Shafer

Research output: Contribution to journal › Article › peer-review

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Abstract

A low-frequency, spectrally broad (I 10kHz) poloidal flow structure that peaks near zero frequency is observed in time-resolved measurements of the turbulence velocity field in the core region (r/0.6a 0.9) of DIII-D tokamak plasmas. These flows exhibit a long poloidal wavelength (low m) and a short radial coherence length comparable to the ambient turbulence decorrelation length. Characteristics of these observed poloidal flows are consistent with the theoretically predicted residual or zero-mean-frequency zonal flows.

Original language	English
Article number	125002
Journal	Physical Review Letters
Volume	97
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.97.125002
State	Published - 2006
Externally published	Yes

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abstract = "A low-frequency, spectrally broad (I 10kHz) poloidal flow structure that peaks near zero frequency is observed in time-resolved measurements of the turbulence velocity field in the core region (r/0.6a 0.9) of DIII-D tokamak plasmas. These flows exhibit a long poloidal wavelength (low m) and a short radial coherence length comparable to the ambient turbulence decorrelation length. Characteristics of these observed poloidal flows are consistent with the theoretically predicted residual or zero-mean-frequency zonal flows.",

author = "Gupta, {D. K.} and Fonck, {R. J.} and McKee, {G. R.} and Schlossberg, {D. J.} and Shafer, {M. W.}",

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AU - McKee, G. R.

AU - Schlossberg, D. J.

AU - Shafer, M. W.

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AB - A low-frequency, spectrally broad (I 10kHz) poloidal flow structure that peaks near zero frequency is observed in time-resolved measurements of the turbulence velocity field in the core region (r/0.6a 0.9) of DIII-D tokamak plasmas. These flows exhibit a long poloidal wavelength (low m) and a short radial coherence length comparable to the ambient turbulence decorrelation length. Characteristics of these observed poloidal flows are consistent with the theoretically predicted residual or zero-mean-frequency zonal flows.

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U2 - 10.1103/PhysRevLett.97.125002

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Detection of zero-mean-frequency zonal flows in the core of a high-temperature tokamak plasma

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