Inward particle transport by plasma collective modes

Antonsen, Thomas M.; Coppi, B.; Englade, R.

doi:10.1088/0029-5515/19/5/007

Cited by 119 publications

(73 citation statements)

References 19 publications

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“…Comparing with the corresponding term in (14) we find that the effect of the boundary layer reduces the collisional term, with a factor (π/2 logν −1/2 ). In Ref.…”

Section: Discussionmentioning

confidence: 79%

Collisionality dependence of the quasilinear particle flux due to microinstabilities

2008

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The collisionality dependence of the quasilinear particle flux due to the ion temperature gradient (ITG) and trapped electron mode (TEM) instabilities is studied, by including electron collisions modeled by a pitch-angle scattering collision operator in the gyrokinetic equation. The inward transport due to ITG-modes is mainly caused by magnetic curvature and thermodiffusion and can be reversed as electron collisions are introduced, if the plasma is far from marginal stability. However, if the plasma is close to marginal stability, collisions may even enhance the inward transport. The sign and the magnitude of the transport are sensitive to the form of the collision operator, to the magnetic drift normalized to the real frequency of the mode, and to the density and temperature scale lengths. These analytical results are in agreement with previously published gyrokinetic simulations. Unlike the ITG-driven flux, the TEM-driven flux is expected to be outwards for conditions far from marginal stability and inwards otherwise.

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“…Comparing with the corresponding term in (14) we find that the effect of the boundary layer reduces the collisional term, with a factor (π/2 logν −1/2 ). In Ref.…”

Section: Discussionmentioning

confidence: 79%

Collisionality dependence of the quasilinear particle flux due to microinstabilities

2008

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“…(21) represents the linear E X B advection of the background density profile and results in che response of Eq. (8). The third term is the nonlinear term written with real nonlinear coefficients n and 6± defined by dividing the sum of all of the terms resulting from averaging the nonlinear terms of Eq.…”

Section: B Self-consistencymentioning

confidence: 99%

“…3,2 Furthermore, similar phenomena are seen in simulations of the rj\ mode, 7 which has been invoked to explain ion thermal transport in tokamaks. 8 Thus, the understanding of these simulations may provide important insight into the behavior of more realistic cases.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear mechanisms for drift wave saturation and induced particle transport

Dimits

Lee

1991

Physics of Fluids B: Plasma Physics

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A detailed theoretical study of the nonlinear dynamics of gyrokinetic particle simulations of electrostatic collisionless and weakly collisionai drift waves is pre sented. In previous studies it was shown that, in the nonlinearly saturated phase of the evolution, the saturation levels and especially the particle fluxes have an unexpected dependence on collisionality. In this paper, the explanations for these collisionality dependences are found to be as follows: The saturation level is deter mined by a balance between the electron and ion fluxes. The ion flux is small for levels of the potential below an E X B-trapping threshold and increases sharply once this threshold is crossed. Due to the presence of resonant electrons, the elec tron flux has a much smoother dependence on the potential. In the 2 ^-dimensional ("pseudo-3D") geometry, the electrons are accelerated away from the resonance as they diffuse spatially, resulting in an inhibition of their diffusion. Collisions and three-dimensional effects can repopulate the resonance thereby increasing the value of the particle flux. DISCLAIMERThis report was prepared is an account of -work sponsored by an agency of ihe Uniiiai Slates Government. Neither Ihe United Stales Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents thai its use would not infringe privately owned rights Refer ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise docs not necessarily constitute or imply its endorsement, recom mendation, or favoring by the United States Government or any agency thereof The views and opinions or authors expressed herein do not necessarily Hale or reflect those of Ihe United States Government or any agency thereof MASTER tp n jt/tl-J' •-

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“…II-IV into a transport code [46]. Here a brief description of this simulation model is given along with a numerical example relevant to the Alcator C lower hyb.rid heating experiment.…”

Section: Simulation Model For Lower Hybrid Heatingmentioning

confidence: 99%

“…The radial transport code [46] consists of a set of mass and energy conservation equations for ions aud electrons. *For simplicity, the density profile is taken to be constant in time (no density transport).…”

Section: A Transport Codementioning

confidence: 99%

Linear Theory of Lower Hybrid Heating

Bonoli

1984

IEEE Trans. Plasma Sci.

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The linear theory of wave propagation in the lower hybrid range of frequencies is presented. The topics of accessibility, linear and quasilinear theories of electron Landau damping, and the linear theory of ion Landau damping are covered. The theory of wave propagation is extended to include the effect of toroidal geometry. A simulation model incorporating these theories is described and numerical results obtained with the model are given.

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Inward particle transport by plasma collective modes

Cited by 119 publications

References 19 publications

Collisionality dependence of the quasilinear particle flux due to microinstabilities

Collisionality dependence of the quasilinear particle flux due to microinstabilities

Nonlinear mechanisms for drift wave saturation and induced particle transport

Linear Theory of Lower Hybrid Heating

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