Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code

E.Z. Gusakov, A.B. Altukhov, V.V. Bulanin, A.D. Gurchenko, Jukka Heikkinen, S.J. Janhunen, S. Leerink, L.A. Esipov, M.Y. Kantor, T.P. Kiviniemi, T. Korpilo, D.V. Kouprienko, S.I. Lashkul, A.V. Petrov, N.V. Teplova

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Abstract

Quantitative reproduction of selected micro-, meso- and macro-scale transport phenomena as measured in the FT-2 tokamak is reached by Elmfire global full-f nonlinear gyrokinetic particle-in-cell simulation predictions. A detailed agreement with mean equilibrium flows, oscillating fine-scale zonal flows and turbulence radial correlation length observed by a set of sophisticated microwave backscattering techniques, as well as a good fit of the thermal diffusivity data in the central and gradient region of discharge are demonstrated. Both the shift and the broadening of the power spectrum of synthetic and experimental Doppler reflectometry diagnostics have been found to overlap perfectly at various radial positions, indicating similar rotation and spreading of the selected density fluctuations. At the same time similar radial electric field dynamics, spatial structure and outward geodesic acoustic mode (GAM) propagation have been observed by comparisons of the probability distribution function, the dominant frequency, the coherence and the cross-phase of the simulated and experimentally measured radial electric field fluctuations, identifying the turbulent driven GAM as a key contributor to the observed strong temporal variation of the radial electric field affected by impurity ions.
Original languageEnglish
Article number124034
JournalPlasma Physics and Controlled Fusion
Volume55
Issue number12
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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Discharge (fluid mechanics)
Turbulence
turbulence
Electric fields
electric fields
high resolution
Oscillating flow
equilibrium flow
propagation modes
acoustics
probability distribution functions
Thermal diffusivity
Backscattering
thermal diffusivity
Power spectrum
Probability distributions
Distribution functions
Macros
power spectra
backscattering

Cite this

Gusakov, E.Z. ; Altukhov, A.B. ; Bulanin, V.V. ; Gurchenko, A.D. ; Heikkinen, Jukka ; Janhunen, S.J. ; Leerink, S. ; Esipov, L.A. ; Kantor, M.Y. ; Kiviniemi, T.P. ; Korpilo, T. ; Kouprienko, D.V. ; Lashkul, S.I. ; Petrov, A.V. ; Teplova, N.V. / Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code. In: Plasma Physics and Controlled Fusion. 2013 ; Vol. 55, No. 12.
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title = "Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code",
abstract = "Quantitative reproduction of selected micro-, meso- and macro-scale transport phenomena as measured in the FT-2 tokamak is reached by Elmfire global full-f nonlinear gyrokinetic particle-in-cell simulation predictions. A detailed agreement with mean equilibrium flows, oscillating fine-scale zonal flows and turbulence radial correlation length observed by a set of sophisticated microwave backscattering techniques, as well as a good fit of the thermal diffusivity data in the central and gradient region of discharge are demonstrated. Both the shift and the broadening of the power spectrum of synthetic and experimental Doppler reflectometry diagnostics have been found to overlap perfectly at various radial positions, indicating similar rotation and spreading of the selected density fluctuations. At the same time similar radial electric field dynamics, spatial structure and outward geodesic acoustic mode (GAM) propagation have been observed by comparisons of the probability distribution function, the dominant frequency, the coherence and the cross-phase of the simulated and experimentally measured radial electric field fluctuations, identifying the turbulent driven GAM as a key contributor to the observed strong temporal variation of the radial electric field affected by impurity ions.",
author = "E.Z. Gusakov and A.B. Altukhov and V.V. Bulanin and A.D. Gurchenko and Jukka Heikkinen and S.J. Janhunen and S. Leerink and L.A. Esipov and M.Y. Kantor and T.P. Kiviniemi and T. Korpilo and D.V. Kouprienko and S.I. Lashkul and A.V. Petrov and N.V. Teplova",
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Gusakov, EZ, Altukhov, AB, Bulanin, VV, Gurchenko, AD, Heikkinen, J, Janhunen, SJ, Leerink, S, Esipov, LA, Kantor, MY, Kiviniemi, TP, Korpilo, T, Kouprienko, DV, Lashkul, SI, Petrov, AV & Teplova, NV 2013, 'Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code', Plasma Physics and Controlled Fusion, vol. 55, no. 12, 124034. https://doi.org/10.1088/0741-3335/55/12/124034

Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code. / Gusakov, E.Z.; Altukhov, A.B.; Bulanin, V.V.; Gurchenko, A.D.; Heikkinen, Jukka; Janhunen, S.J.; Leerink, S.; Esipov, L.A.; Kantor, M.Y.; Kiviniemi, T.P.; Korpilo, T.; Kouprienko, D.V.; Lashkul, S.I.; Petrov, A.V.; Teplova, N.V.

In: Plasma Physics and Controlled Fusion, Vol. 55, No. 12, 124034, 2013.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code

AU - Gusakov, E.Z.

AU - Altukhov, A.B.

AU - Bulanin, V.V.

AU - Gurchenko, A.D.

AU - Heikkinen, Jukka

AU - Janhunen, S.J.

AU - Leerink, S.

AU - Esipov, L.A.

AU - Kantor, M.Y.

AU - Kiviniemi, T.P.

AU - Korpilo, T.

AU - Kouprienko, D.V.

AU - Lashkul, S.I.

AU - Petrov, A.V.

AU - Teplova, N.V.

PY - 2013

Y1 - 2013

N2 - Quantitative reproduction of selected micro-, meso- and macro-scale transport phenomena as measured in the FT-2 tokamak is reached by Elmfire global full-f nonlinear gyrokinetic particle-in-cell simulation predictions. A detailed agreement with mean equilibrium flows, oscillating fine-scale zonal flows and turbulence radial correlation length observed by a set of sophisticated microwave backscattering techniques, as well as a good fit of the thermal diffusivity data in the central and gradient region of discharge are demonstrated. Both the shift and the broadening of the power spectrum of synthetic and experimental Doppler reflectometry diagnostics have been found to overlap perfectly at various radial positions, indicating similar rotation and spreading of the selected density fluctuations. At the same time similar radial electric field dynamics, spatial structure and outward geodesic acoustic mode (GAM) propagation have been observed by comparisons of the probability distribution function, the dominant frequency, the coherence and the cross-phase of the simulated and experimentally measured radial electric field fluctuations, identifying the turbulent driven GAM as a key contributor to the observed strong temporal variation of the radial electric field affected by impurity ions.

AB - Quantitative reproduction of selected micro-, meso- and macro-scale transport phenomena as measured in the FT-2 tokamak is reached by Elmfire global full-f nonlinear gyrokinetic particle-in-cell simulation predictions. A detailed agreement with mean equilibrium flows, oscillating fine-scale zonal flows and turbulence radial correlation length observed by a set of sophisticated microwave backscattering techniques, as well as a good fit of the thermal diffusivity data in the central and gradient region of discharge are demonstrated. Both the shift and the broadening of the power spectrum of synthetic and experimental Doppler reflectometry diagnostics have been found to overlap perfectly at various radial positions, indicating similar rotation and spreading of the selected density fluctuations. At the same time similar radial electric field dynamics, spatial structure and outward geodesic acoustic mode (GAM) propagation have been observed by comparisons of the probability distribution function, the dominant frequency, the coherence and the cross-phase of the simulated and experimentally measured radial electric field fluctuations, identifying the turbulent driven GAM as a key contributor to the observed strong temporal variation of the radial electric field affected by impurity ions.

U2 - 10.1088/0741-3335/55/12/124034

DO - 10.1088/0741-3335/55/12/124034

M3 - Article

VL - 55

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

M1 - 124034

ER -