Inhibition of the trapped ion mode by drift wave fluctuations

Horton, W.; Choi, Duk In; Terry, P. W.; Biskamp, D.

doi:10.1063/1.863008

Cited by 14 publications

(10 citation statements)

References 19 publications

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“…In sharp contrast to this picture Horton, Choi, et al (1980) argued that the trapped ion mode must coexist in a sea of turbulent drift-wave fluctuations. These shorter scale k y s ϳ0.3, faster growing modes (k, ) were taken into account and shown to dominate.…”

Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 95%

“…Thus, the usual drift-wave space-time scale plasma turbulence must be taken into account in considering the dynamics of the trapped ion mode. Horton, Choi, et al (1980) used standard scale separation procedures (q,⍀)Ӷ(k, ) to show that the trapped ion mode transport (q,⍀) is suppressed by the sea of drift-wave fluctuations (k, ). The calculation is complicated and some assumptions must be made in determining the growth rate of the trapped ion mode renormalized by the background drift-wave fluctuations.…”

Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 99%

“…What is not so clear without the results of the Kingsbury and Waltz simulations is whether the large correlations envisioned by Shapiro et al (1993) can build up or whether the drift-wave turbulence disrupts the trapped ion mode growth mechanism as given by Horton, Choi, et al (1980). The simulations address the issue further by comparing 85 2 , 170 2 , and 340 2 truncated k-space simulations to demonstrate good convergence to the driftwave diffusion coefficient of Dϭ5.2D dw where D dw ϭ( s /L n )(cT e /eB).…”

Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 99%

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Drift waves and transport

1999

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Drift waves occur universally in magnetized plasmas producing the dominant mechanism for the transport of particles, energy and momentum across magnetic field lines. A wealth of information obtained from quasistationary laboratory experiments for plasma confinement is reviewed for drift waves driven unstable by density gradients, temperature gradients and trapped particle effects. The modern understanding of Bohm transport and the role of sheared flows and magnetic shear in reducing the transport to the gyro-Bohm rate are explained and illustrated with large scale computer simulations. The types of mixed wave and vortex turbulence spontaneously generated in nonuniform plasmas are derived with reduced magnetized fluid descriptions. The types of theoretical descriptions reviewed include weak turbulence theory, Kolmogorov anisotropic spectral indices, and the mixing length. A number of standard turbulent diffusivity formulas are given for the various space-time scales of the drift-wave turbulent mixing. [S0034-6861(99)00803-X] CONTENTS

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Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 95%

Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 99%

Section: E Trapped Ion Mode Low-frequency Drift-wave Turbulencementioning

confidence: 99%

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Drift waves and transport

1999

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“…where it is assumed that only the small scale self interactions are the important interactions in the RHS [26]. Using typical tokamak parameters (T i = T e = 10kev, n i = n e = 10 20 m −3 , r = 1m, R = 3m) µ = 0.78ν ii (r/R) and ν ii = 10 −12 n i /T 3/2 i and ν ii is the ion-ion collision frequency, T i is the ion temperature in electron volts.…”

Section: The Wave Kinetic Equation and Zonal Flow Evolutionmentioning

confidence: 99%

Zonal flow generation in ion temperature gradient mode turbulence

et al. 2002

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In the present work the zonal flow (ZF) growth rate in toroidal ion-temperature-gradient (ITG) mode turbulence including the effects of elongation is studied analytically. The scaling of the ZF growth with plasma parameters is examined for typical tokamak parameter values. The physical model used for the toroidal ITG driven mode is based on the ion continuity and ion temperature equations whereas the ZF evolution is described by the vorticity equation. The results indicate that a large ZF growth is found close to marginal stability and for peaked density profiles and these effects may be enhanced by elongation.Comment: 20 pages, 5 figure

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“…It is therefore natural to try to extend those methods to plasma dynamics models relevant to the transport problem, like 3D ion-temperature-gradient-driven turbulence (ITG) models (Horton et al 1980(Horton et al , 1981(Horton et al , 1993.…”

Section: Introductionmentioning

confidence: 99%

Coherent drift-wave structures in toroidal plasmas

Horton

Tajima

Kim³

et al. 1996

J. Plasma Phys.

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Using the ion-temperature-gradient-driven drift waves as a paradigm for drift-wave anomalous transport, we explore the structure of the linear and nonlinear modes. Two phases of transport are shown to exist: (i) Bohm-like transport for parameters close to marginal stability; (ii) gyro-Bohm transport for turbulent convection cells in systems driven away from marginal stability. Nonlinear relaxation to large-scale coherent convective structures is observed in three-dimensional toroidal particle simulations.

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Inhibition of the trapped ion mode by drift wave fluctuations

Cited by 14 publications

References 19 publications

Drift waves and transport

Drift waves and transport

Zonal flow generation in ion temperature gradient mode turbulence

Coherent drift-wave structures in toroidal plasmas

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