Core momentum and particle transport studies in the ASDEX Upgrade tokamak

ASDEX Upgrade Team

Research output: Contribution to journalArticleScientificpeer-review

61 Citations (Scopus)

Abstract

Core momentum and particle transport in ASDEX Upgrade (AUG) have been examined in a wide variety of plasma discharges and via several different methods. Experiments were performed in which ECRH power was added to NBI heated H-modes causing the electron and impurity ion density profiles to peak and the core toroidal rotation to flatten. Turbulence calculations of these plasmas show a change in the dominant regime from ITG to TEM due to the ECRH induced changes in the electron and ion temperature profiles. The impurity and electron density behavior can be fully explained by the changes in the turbulent particle transport. Momentum transport analyses demonstrate that in the TEM regime there is a core localized, counter-current directed, residual stress momentum flux of the same order of magnitude as the applied NBI torque. The initial results from momentum modulation experiments performed on AUG confirm that the Prandtl number in AUG NBI heated H-modes is close to 1 and that there exists a significant inward momentum pinch. Lastly, an intrinsic toroidal rotation database has been developed at AUG which can be used to test theoretically predicted dependences of residual stress momentum fluxes. Initial results show a linear correlation between the gradient of the toroidal rotation and both the electron density gradient scale length and the frequency of the dominant turbulent mode.
Original languageEnglish
Article number124013
Number of pages13
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number12
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed
Event38th EPS Conference on Plasma Physics - Strasbourg, France
Duration: 27 Jun 20111 Jul 2011

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Momentum
momentum
residual stress
Carrier concentration
Residual stresses
Impurities
Fluxes
Transmission electron microscopy
Plasmas
impurities
gradients
transmission electron microscopy
Electrons
Prandtl number
Ions
ion temperature
temperature profiles
plasma jets
torque
counters

Cite this

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title = "Core momentum and particle transport studies in the ASDEX Upgrade tokamak",
abstract = "Core momentum and particle transport in ASDEX Upgrade (AUG) have been examined in a wide variety of plasma discharges and via several different methods. Experiments were performed in which ECRH power was added to NBI heated H-modes causing the electron and impurity ion density profiles to peak and the core toroidal rotation to flatten. Turbulence calculations of these plasmas show a change in the dominant regime from ITG to TEM due to the ECRH induced changes in the electron and ion temperature profiles. The impurity and electron density behavior can be fully explained by the changes in the turbulent particle transport. Momentum transport analyses demonstrate that in the TEM regime there is a core localized, counter-current directed, residual stress momentum flux of the same order of magnitude as the applied NBI torque. The initial results from momentum modulation experiments performed on AUG confirm that the Prandtl number in AUG NBI heated H-modes is close to 1 and that there exists a significant inward momentum pinch. Lastly, an intrinsic toroidal rotation database has been developed at AUG which can be used to test theoretically predicted dependences of residual stress momentum fluxes. Initial results show a linear correlation between the gradient of the toroidal rotation and both the electron density gradient scale length and the frequency of the dominant turbulent mode.",
author = "R.M. McDermott and C. Angioni and R. Dux and E. Fable and T. P{\"u}tterich and F. Ryter and Antti Salmi and Tuomas Tala and G. Tardini and E. Viezzer and {ASDEX Upgrade Team}",
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Core momentum and particle transport studies in the ASDEX Upgrade tokamak. / ASDEX Upgrade Team.

In: Plasma Physics and Controlled Fusion, Vol. 53, No. 12, 124013, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Core momentum and particle transport studies in the ASDEX Upgrade tokamak

AU - McDermott, R.M.

AU - Angioni, C.

AU - Dux, R.

AU - Fable, E.

AU - Pütterich, T.

AU - Ryter, F.

AU - Salmi, Antti

AU - Tala, Tuomas

AU - Tardini, G.

AU - Viezzer, E.

AU - ASDEX Upgrade Team

PY - 2011

Y1 - 2011

N2 - Core momentum and particle transport in ASDEX Upgrade (AUG) have been examined in a wide variety of plasma discharges and via several different methods. Experiments were performed in which ECRH power was added to NBI heated H-modes causing the electron and impurity ion density profiles to peak and the core toroidal rotation to flatten. Turbulence calculations of these plasmas show a change in the dominant regime from ITG to TEM due to the ECRH induced changes in the electron and ion temperature profiles. The impurity and electron density behavior can be fully explained by the changes in the turbulent particle transport. Momentum transport analyses demonstrate that in the TEM regime there is a core localized, counter-current directed, residual stress momentum flux of the same order of magnitude as the applied NBI torque. The initial results from momentum modulation experiments performed on AUG confirm that the Prandtl number in AUG NBI heated H-modes is close to 1 and that there exists a significant inward momentum pinch. Lastly, an intrinsic toroidal rotation database has been developed at AUG which can be used to test theoretically predicted dependences of residual stress momentum fluxes. Initial results show a linear correlation between the gradient of the toroidal rotation and both the electron density gradient scale length and the frequency of the dominant turbulent mode.

AB - Core momentum and particle transport in ASDEX Upgrade (AUG) have been examined in a wide variety of plasma discharges and via several different methods. Experiments were performed in which ECRH power was added to NBI heated H-modes causing the electron and impurity ion density profiles to peak and the core toroidal rotation to flatten. Turbulence calculations of these plasmas show a change in the dominant regime from ITG to TEM due to the ECRH induced changes in the electron and ion temperature profiles. The impurity and electron density behavior can be fully explained by the changes in the turbulent particle transport. Momentum transport analyses demonstrate that in the TEM regime there is a core localized, counter-current directed, residual stress momentum flux of the same order of magnitude as the applied NBI torque. The initial results from momentum modulation experiments performed on AUG confirm that the Prandtl number in AUG NBI heated H-modes is close to 1 and that there exists a significant inward momentum pinch. Lastly, an intrinsic toroidal rotation database has been developed at AUG which can be used to test theoretically predicted dependences of residual stress momentum fluxes. Initial results show a linear correlation between the gradient of the toroidal rotation and both the electron density gradient scale length and the frequency of the dominant turbulent mode.

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DO - 10.1088/0741-3335/53/12/124013

M3 - Article

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JO - Plasma Physics and Controlled Fusion

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