Electromagnetic effects on toroidal momentum transport

Mahmood, M. Ansar; Eriksson, Annika; Weiland, Jan

doi:10.1063/1.3511441

Cited by 14 publications

(11 citation statements)

References 24 publications

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“…Full agreement was obtained between the fluid approach in [60] and the gyrofluid equations in [57,58]. We have here included electromagnetic effects for the toroidal momentum [15,65,70]. Also electromagnetic effects may enhance the pinch [70].…”

Section: Momentum Transportmentioning

confidence: 92%

Review of mixing length estimates and effects of toroidicity in a fluid model for turbulent transport in tokamaks

Weiland

2016

Plasma Phys. Rep.

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Basic aspects of turbulent transport in toroidal magnetized plasmas are discussed. In particular the fluid closure has strong effects on zonal flows which are needed to create an absorbing boundary for long wave lengths and also to obtain the Dimits nonlinear upshift. The fluid resonance in the energy equation is found to be instrumental for generating the L-H transition, the spin-up of poloidal rotation in internal transport barriers, as well as the nonlinear Dimits upshift. The difference between the linearly fastest growing mode number and the corresponding longer nonlinear correlation length is also addressed. It is found that the Kadomtsev mixing length result is consistent with the non-Markovian diagonal limit of the transport at the nonlinearly obtained correlation length.

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Section: Momentum Transportmentioning

confidence: 92%

Review of mixing length estimates and effects of toroidicity in a fluid model for turbulent transport in tokamaks

Weiland

2016

Plasma Phys. Rep.

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“…The net toroidal momentum flux is outward in equilibrium since there is a torque deposition in the interior. There is, however, a strong inward component of the toroidal flux which enhances the inward peaking 9 . We notice that the simulated profiles have somewhat more pronounced barriers (in particular Vtor) but the central values are quite similar to the experimental.…”

Section: Simulationsmentioning

confidence: 99%

“…It was recently found that electromagnetic effects increase the toroidal momentum pinch 9 . The first term on the right hand side is the ExB convection in the background velocity gradient.…”

Section: Formulationmentioning

confidence: 99%

Comparison of Edge and Internal Transport Barriers in Drift Wave Predictive Simulations

Crombé¹,

Mantica²,

Naulin³

et al. 2011

AIP Conference Proceedings

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Abstract.We have simulated the formation of an internal transport barrier on JET including a self-consistent treatment of ion and electron temperatures and poloidal and toroidal momentum. Similar simulations of edge transport barriers, including the L-H transition have also been made. However, here only polodal momentum and the temperatures were simulated. The internal barrier included an anomalous spinup of poloidal momentum similar to that in the experiment. Also the edge barrier was accompanied by a spinup of poloidal momentum. The experimental density (with no barrier) was used and kept fixed for the internal barrier. For the edge barrier the edge density was varied and it turned out that a lower edge density gave a stronger barrier. Electromagnetic and nonlocal effects were important for both types of barriers.

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“…In previous works, electromagnetic effects on toroidal momentum flux including diffusivity and off-diagonal component were reported [21,22]. The intrinsic stress force driven by electromagnetic turbulence has also been done [23,24].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic parallel rotation drive by electromagnetic ion temperature gradient turbulence

2016

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The quasilinear intrinsic parallel flow drive including parallel residual stress, kinetic stress, cross Maxwell stress and parallel turbulent acceleration by electromagnetic ion temperature gradient (ITG) turbulence is calculated analytically using electromagnetic gyrokinetic theory. Both the kinetic stress and cross Maxwell stress also enter the mean parallel flow velocity equation via their divergence, as for the usual residual stress. The turbulent acceleration driven by ion pressure gradient along the total magnetic field (including equilibrium magnetic field and fluctuating radial magnetic field) cannot be written as a divergence of stress, and so should be treated as a local source/sink. All these terms can provide intrinsic parallel rotation drive.Electromagnetic effects reduce the non-resonant electrostatic stress force and even reverse it, but enhance the resonant stress force. Both the non-resonant and resonant turbulent acceleration terms are also enhanced by electromagnetic effects. The possible implications of our results for experimental observations are discussed.

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Electromagnetic effects on toroidal momentum transport

Cited by 14 publications

References 24 publications

Review of mixing length estimates and effects of toroidicity in a fluid model for turbulent transport in tokamaks

Review of mixing length estimates and effects of toroidicity in a fluid model for turbulent transport in tokamaks

Comparison of Edge and Internal Transport Barriers in Drift Wave Predictive Simulations

Intrinsic parallel rotation drive by electromagnetic ion temperature gradient turbulence

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