Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak

A.D. Gurchenko, E.Z. Gusakov, D.V. Kouprienko, S. Leerink, A.B. Altukhov, Jukka A. Heikkinen, S.I. Lashkul, L.A. Esipov, A.Yu. Stepanov

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Abstract

Implementation of the correlative enhanced scattering technique in the FT-2 tokamak has resulted in measurements of both frequency and wave number spectra of a small-scale microturbulence. It is found that during the dynamic current ramp-up discharge the turbulence possesses a wide wave number spectrum which could be described by universal exponential dependence in the range of 3–4 orders of amplitude characterized by two parameters—the turbulence level and scale length. Both parameters are found to decrease substantially when the shear of the poloidal plasma rotation estimated from Doppler frequency shift of the enhanced scattering signal increases at plasma periphery. Simultaneously transition to an improved confinement resulting in the suppression of anomalous electron transport and decrease in the electron energy confinement time is observed in the experiment.
Original languageEnglish
Article number035010
JournalPlasma Physics and Controlled Fusion
Volume52
Issue number3
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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Turbulence
turbulence
Scattering
Plasmas
Plasma confinement
Ions
ramps
scattering
Discharge (fluid mechanics)
frequency shift
ions
retarding
electron energy
shear
Electrons
electrons
Experiments
Electron Transport

Cite this

Gurchenko, A. D., Gusakov, E. Z., Kouprienko, D. V., Leerink, S., Altukhov, A. B., Heikkinen, J. A., ... Stepanov, A. Y. (2010). Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak. Plasma Physics and Controlled Fusion, 52(3), [035010]. https://doi.org/10.1088/0741-3335/52/3/035010
Gurchenko, A.D. ; Gusakov, E.Z. ; Kouprienko, D.V. ; Leerink, S. ; Altukhov, A.B. ; Heikkinen, Jukka A. ; Lashkul, S.I. ; Esipov, L.A. ; Stepanov, A.Yu. / Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak. In: Plasma Physics and Controlled Fusion. 2010 ; Vol. 52, No. 3.
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title = "Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak",
abstract = "Implementation of the correlative enhanced scattering technique in the FT-2 tokamak has resulted in measurements of both frequency and wave number spectra of a small-scale microturbulence. It is found that during the dynamic current ramp-up discharge the turbulence possesses a wide wave number spectrum which could be described by universal exponential dependence in the range of 3–4 orders of amplitude characterized by two parameters—the turbulence level and scale length. Both parameters are found to decrease substantially when the shear of the poloidal plasma rotation estimated from Doppler frequency shift of the enhanced scattering signal increases at plasma periphery. Simultaneously transition to an improved confinement resulting in the suppression of anomalous electron transport and decrease in the electron energy confinement time is observed in the experiment.",
author = "A.D. Gurchenko and E.Z. Gusakov and D.V. Kouprienko and S. Leerink and A.B. Altukhov and Heikkinen, {Jukka A.} and S.I. Lashkul and L.A. Esipov and A.Yu. Stepanov",
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Gurchenko, AD, Gusakov, EZ, Kouprienko, DV, Leerink, S, Altukhov, AB, Heikkinen, JA, Lashkul, SI, Esipov, LA & Stepanov, AY 2010, 'Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak', Plasma Physics and Controlled Fusion, vol. 52, no. 3, 035010. https://doi.org/10.1088/0741-3335/52/3/035010

Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak. / Gurchenko, A.D.; Gusakov, E.Z.; Kouprienko, D.V.; Leerink, S.; Altukhov, A.B.; Heikkinen, Jukka A.; Lashkul, S.I.; Esipov, L.A.; Stepanov, A.Yu.

In: Plasma Physics and Controlled Fusion, Vol. 52, No. 3, 035010, 2010.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Observation of turbulence exponential wave number spectra at ion sub-Larmor scales in FT-2 tokamak

AU - Gurchenko, A.D.

AU - Gusakov, E.Z.

AU - Kouprienko, D.V.

AU - Leerink, S.

AU - Altukhov, A.B.

AU - Heikkinen, Jukka A.

AU - Lashkul, S.I.

AU - Esipov, L.A.

AU - Stepanov, A.Yu.

PY - 2010

Y1 - 2010

N2 - Implementation of the correlative enhanced scattering technique in the FT-2 tokamak has resulted in measurements of both frequency and wave number spectra of a small-scale microturbulence. It is found that during the dynamic current ramp-up discharge the turbulence possesses a wide wave number spectrum which could be described by universal exponential dependence in the range of 3–4 orders of amplitude characterized by two parameters—the turbulence level and scale length. Both parameters are found to decrease substantially when the shear of the poloidal plasma rotation estimated from Doppler frequency shift of the enhanced scattering signal increases at plasma periphery. Simultaneously transition to an improved confinement resulting in the suppression of anomalous electron transport and decrease in the electron energy confinement time is observed in the experiment.

AB - Implementation of the correlative enhanced scattering technique in the FT-2 tokamak has resulted in measurements of both frequency and wave number spectra of a small-scale microturbulence. It is found that during the dynamic current ramp-up discharge the turbulence possesses a wide wave number spectrum which could be described by universal exponential dependence in the range of 3–4 orders of amplitude characterized by two parameters—the turbulence level and scale length. Both parameters are found to decrease substantially when the shear of the poloidal plasma rotation estimated from Doppler frequency shift of the enhanced scattering signal increases at plasma periphery. Simultaneously transition to an improved confinement resulting in the suppression of anomalous electron transport and decrease in the electron energy confinement time is observed in the experiment.

U2 - 10.1088/0741-3335/52/3/035010

DO - 10.1088/0741-3335/52/3/035010

M3 - Article

VL - 52

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 3

M1 - 035010

ER -