Search for the ion temperature gradient mode in a tokamak plasma and comparison with theoretical predictions

C. L. Rettig; T. L. Rhodes; J. N. Leboeuf; W. A. Peebles; E. J. Doyle; G. M. Staebler; K. H. Burrell; R. A. Moyer

doi:10.1063/1.1362537

Search for the ion temperature gradient mode in a tokamak plasma and comparison with theoretical predictions

C. L. Rettig, T. L. Rhodes, J. N. Leboeuf, W. A. Peebles, E. J. Doyle, G. M. Staebler, K. H. Burrell, R. A. Moyer

Research output: Contribution to journal › Conference article › peer-review

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Abstract

In recent experiments in DIII-D, comparison of specific turbulence characteristics, with linear and nonlinear modeling has identified common features associated with the ion temperature gradient (ITG) mode. A low-frequency turbulence feature is observed in high-density saturated Ohmic confinement discharges, which is absent in low-density linear Ohmic confinement discharges. The feature is in a range of wavelength (k_⊥ρ_v≈0.2-0.5) and the frequency expected for the ITG mode and onset of the feature is coincident with onset of confinement saturation. The density profile is significantly broader in the high-density discharge, a known destabilizing effect on the ITG mode. Gyrokinetic stability calculations of the growth rate of the most unstable drift ballooning mode show the ITG mode to be more unstable in the high-density discharges.

Original language	English
Pages (from-to)	2232-2237
Number of pages	6
Journal	Physics of Plasmas
Volume	8
Issue number	5 II
DOIs	https://doi.org/10.1063/1.1362537
State	Published - May 2001
Externally published	Yes
Event	42nd Annual Meeting of the APS Division of Plasma Physics - Quebec, Que, Canada Duration: Oct 23 2000 → Oct 27 2000

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title = "Search for the ion temperature gradient mode in a tokamak plasma and comparison with theoretical predictions",

abstract = "In recent experiments in DIII-D, comparison of specific turbulence characteristics, with linear and nonlinear modeling has identified common features associated with the ion temperature gradient (ITG) mode. A low-frequency turbulence feature is observed in high-density saturated Ohmic confinement discharges, which is absent in low-density linear Ohmic confinement discharges. The feature is in a range of wavelength (k⊥ρv≈0.2-0.5) and the frequency expected for the ITG mode and onset of the feature is coincident with onset of confinement saturation. The density profile is significantly broader in the high-density discharge, a known destabilizing effect on the ITG mode. Gyrokinetic stability calculations of the growth rate of the most unstable drift ballooning mode show the ITG mode to be more unstable in the high-density discharges.",

author = "Rettig, {C. L.} and Rhodes, {T. L.} and Leboeuf, {J. N.} and Peebles, {W. A.} and Doyle, {E. J.} and Staebler, {G. M.} and Burrell, {K. H.} and Moyer, {R. A.}",

year = "2001",

month = may,

doi = "10.1063/1.1362537",

language = "English",

volume = "8",

pages = "2232--2237",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5 II",

note = "42nd Annual Meeting of the APS Division of Plasma Physics ; Conference date: 23-10-2000 Through 27-10-2000",

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TY - JOUR

T1 - Search for the ion temperature gradient mode in a tokamak plasma and comparison with theoretical predictions

AU - Rettig, C. L.

AU - Rhodes, T. L.

AU - Leboeuf, J. N.

AU - Peebles, W. A.

AU - Doyle, E. J.

AU - Staebler, G. M.

AU - Burrell, K. H.

AU - Moyer, R. A.

PY - 2001/5

Y1 - 2001/5

N2 - In recent experiments in DIII-D, comparison of specific turbulence characteristics, with linear and nonlinear modeling has identified common features associated with the ion temperature gradient (ITG) mode. A low-frequency turbulence feature is observed in high-density saturated Ohmic confinement discharges, which is absent in low-density linear Ohmic confinement discharges. The feature is in a range of wavelength (k⊥ρv≈0.2-0.5) and the frequency expected for the ITG mode and onset of the feature is coincident with onset of confinement saturation. The density profile is significantly broader in the high-density discharge, a known destabilizing effect on the ITG mode. Gyrokinetic stability calculations of the growth rate of the most unstable drift ballooning mode show the ITG mode to be more unstable in the high-density discharges.

AB - In recent experiments in DIII-D, comparison of specific turbulence characteristics, with linear and nonlinear modeling has identified common features associated with the ion temperature gradient (ITG) mode. A low-frequency turbulence feature is observed in high-density saturated Ohmic confinement discharges, which is absent in low-density linear Ohmic confinement discharges. The feature is in a range of wavelength (k⊥ρv≈0.2-0.5) and the frequency expected for the ITG mode and onset of the feature is coincident with onset of confinement saturation. The density profile is significantly broader in the high-density discharge, a known destabilizing effect on the ITG mode. Gyrokinetic stability calculations of the growth rate of the most unstable drift ballooning mode show the ITG mode to be more unstable in the high-density discharges.

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U2 - 10.1063/1.1362537

DO - 10.1063/1.1362537

M3 - Conference article

AN - SCOPUS:0035335472

SN - 1070-664X

VL - 8

SP - 2232

EP - 2237

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5 II

T2 - 42nd Annual Meeting of the APS Division of Plasma Physics

Y2 - 23 October 2000 through 27 October 2000

ER -

Search for the ion temperature gradient mode in a tokamak plasma and comparison with theoretical predictions

Abstract

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