Electric field effects on ion temperature gradient modes in a sheared slab

G. M. Staebler; R. R. Dominguez

doi:10.1088/0029-5515/31/10/007

Electric field effects on ion temperature gradient modes in a sheared slab

G. M. Staebler, R. R. Dominguez

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Abstract

The effects of spatially inhomogeneous equilibrium electric fields on a fully kinetic model of the ion temperature gradient (ITG) mode in a sheared slab magnetic field is investigated. It is found that a gradient in the electric field of either sign, or a positive second derivative, reduces both the growth rate and the transport rates for heat and particles. The electric field structure in the region of a few centimetres inside the separatrix of a DIII-D plasma exhibits a well which is deepened during the transition to the H-mode. This deepening of the electric field well is found to be strongly stabilizing for ITG modes in the experimental range of parameters. This is consistent with the observation of reduced fluctuations in this region.

Original language	English
Pages (from-to)	1891-1898
Number of pages	8
Journal	Nuclear Fusion
Volume	31
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/31/10/007
State	Published - Oct 1991
Externally published	Yes

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abstract = "The effects of spatially inhomogeneous equilibrium electric fields on a fully kinetic model of the ion temperature gradient (ITG) mode in a sheared slab magnetic field is investigated. It is found that a gradient in the electric field of either sign, or a positive second derivative, reduces both the growth rate and the transport rates for heat and particles. The electric field structure in the region of a few centimetres inside the separatrix of a DIII-D plasma exhibits a well which is deepened during the transition to the H-mode. This deepening of the electric field well is found to be strongly stabilizing for ITG modes in the experimental range of parameters. This is consistent with the observation of reduced fluctuations in this region.",

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N2 - The effects of spatially inhomogeneous equilibrium electric fields on a fully kinetic model of the ion temperature gradient (ITG) mode in a sheared slab magnetic field is investigated. It is found that a gradient in the electric field of either sign, or a positive second derivative, reduces both the growth rate and the transport rates for heat and particles. The electric field structure in the region of a few centimetres inside the separatrix of a DIII-D plasma exhibits a well which is deepened during the transition to the H-mode. This deepening of the electric field well is found to be strongly stabilizing for ITG modes in the experimental range of parameters. This is consistent with the observation of reduced fluctuations in this region.

AB - The effects of spatially inhomogeneous equilibrium electric fields on a fully kinetic model of the ion temperature gradient (ITG) mode in a sheared slab magnetic field is investigated. It is found that a gradient in the electric field of either sign, or a positive second derivative, reduces both the growth rate and the transport rates for heat and particles. The electric field structure in the region of a few centimetres inside the separatrix of a DIII-D plasma exhibits a well which is deepened during the transition to the H-mode. This deepening of the electric field well is found to be strongly stabilizing for ITG modes in the experimental range of parameters. This is consistent with the observation of reduced fluctuations in this region.

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JO - Nuclear Fusion

JF - Nuclear Fusion

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ER -

Electric field effects on ion temperature gradient modes in a sheared slab

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