Intrinsic Rotation Driven by Non-Maxwellian Equilibria in Tokamak Plasmas

Barnes, Michael; Parra, Félix I.; Lee, Jungpyo; Belli, E. A.; Nave, M. F. F.; White, Anne

doi:10.1103/physrevlett.111.055005

Cited by 51 publications

(95 citation statements)

References 38 publications

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“…al. 17 and studied on MAST 18 which does point to the ion-ion collisionality as an important parameter in the intrinsic momentum transport (and therefore intrinsic rotation). More extensive experimental data and a more detailed theoretical comparison would be necessary to see which model correctly predicts the experimental rotation, but that is left for future work.…”

Section: Discussionmentioning

confidence: 99%

The effects of main-ion dilution on turbulence in low q95 C-Mod ohmic plasmas, and comparisons with nonlinear GYRO

et al. 2016

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Recent experiments on C-mod seeding nitrogen into ohmic plasmas with q95 = 3.4 found that the seeding greatly reduced long-wavelength (ITG-scale) turbulence. The long-wavelength turbulence that was reduced by the nitrogen seeding was localized to the region of r/a≈0.85, where the turbulence is well above marginal stability (as evidenced by Qi/QGB≫1). The nonlinear gyrokinetic code GYRO was used to simulate the expected turbulence in these plasmas, and the simulated turbulent density fluctuations and turbulent energy fluxes quantitatively agreed with the experimental measurements both before and after the nitrogen seeding. Unexpectedly, the intrinsic rotation of the plasma was also found to be affected by the nitrogen seeding, in a manner apparently unrelated to a change in the electron-ion collisionality that was proposed by other experiments.

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Section: Discussionmentioning

confidence: 99%

The effects of main-ion dilution on turbulence in low q95 C-Mod ohmic plasmas, and comparisons with nonlinear GYRO

et al. 2016

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“…In recent years, theoretical [1,2,3,6,15,16,17,18,19] and experimental [20,21,22,23,24,25] work throughout the fusion community has focused on understanding turbulent impurity and momentum transport and their connections in the tokamak core. Several experiments have noted that changes in the toroidal rotation profile shape, from peaked to hollow, are possibly related to the transition from linear ITG to TEM dominance.…”

Section: Introductionmentioning

confidence: 99%

Impurity transport, turbulence transitions and intrinsic rotation in Alcator C-Mod plasmas

Howard¹,

White²,

Greenwald³

et al. 2014

Plasma Phys. Control. Fusion

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Abstract. Linear and nonlinear gyrokinetic simulations are used to probe turbulent impurity transport in intrinsically rotating tokamak plasmas. For this simulation-based study, experimental input parameters are taken from pair of ICRF heated Alcator CMod discharges exhibiting a change in the sign of the normalized toroidal rotation gradient at mid radius (i.e. a change from hollow to peaked intrinsic rotation profiles). The simulations show that there is no change in the peaking of the calcium impurity between the plasmas with peaked and hollow rotation profiles, suggesting that the impurity transport and the shape of the rotation do not always change together. Furthermore, near midradius, r/a =0.5 (normalized midplane minor radius), the linear and nonlinear gyrokinetic simulations exhibit no evidence of a transition in linear dominance from Ion Temperature Gradient (ITG) to Trapped Electron Mode (TEM) when the intrinsic rotation profile changes from peaked to hollow. Extensive nonlinear sensitivity analysis is performed, and there is no change in the ITG critical gradient or in the stiffness of ion heat transport with the change in the intrinsic toroidal rotation profile shape, which suggests that the shape of the rotation profile is not dominated by the ITG onset in these cases.

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“…These new results suggest that the drive for momentum transport differs from drives for heat and particle transport, possibly entering the gyrokinetic model formulation at a higher order. 286 …”

Section: Momentum Transportmentioning

confidence: 99%

20 years of research on the Alcator C-Mod tokamak

et al. 2014

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The object of this review is to summarize the achievements of research on the Alcator C-Mod tokamak [Hutchinson et al., Phys. Plasmas 1, 1511 and Marmar, Fusion Sci. Technol. 51, 261 (2007)] and to place that research in the context of the quest for practical fusion energy. C-Mod is a compact, high-field tokamak, whose unique design and operating parameters have produced a wealth of new and important results since it began operation in 1993, contributing data that extends tests of critical physical models into new parameter ranges and into new regimes. Using only highpower radio frequency (RF) waves for heating and current drive with innovative launching structures, C-Mod operates routinely at reactor level power densities and achieves plasma pressures higher than any other toroidal confinement device. C-Mod spearheaded the development of the vertical-target divertor and has always operated with high-Z metal plasma facing componentsapproaches subsequently adopted for ITER. C-Mod has made ground-breaking discoveries in divertor physics and plasma-material interactions at reactor-like power and particle fluxes and elucidated a) Paper AR1 1, Bull. Am. Phys. Soc. 58, 21 (2013). b) Invited speaker.

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Intrinsic Rotation Driven by Non-Maxwellian Equilibria in Tokamak Plasmas

Cited by 51 publications

References 38 publications

The effects of main-ion dilution on turbulence in low q95 C-Mod ohmic plasmas, and comparisons with nonlinear GYRO

The effects of main-ion dilution on turbulence in low q95 C-Mod ohmic plasmas, and comparisons with nonlinear GYRO

Impurity transport, turbulence transitions and intrinsic rotation in Alcator C-Mod plasmas

20 years of research on the Alcator C-Mod tokamak

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