Impurity-Induced Suppression of Core Turbulence and Transport in the DIII-D Tokamak

G. McKee; K. Burrell; R. Fonck; G. Jackson; M. Murakami; G. Staebler; D. Thomas; P. West

doi:10.1103/PhysRevLett.84.1922

Impurity-Induced Suppression of Core Turbulence and Transport in the DIII-D Tokamak

G. McKee, K. Burrell, R. Fonck, G. Jackson, M. Murakami, G. Staebler, D. Thomas, P. West

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

Turbulence is significantly reduced in a tokamak plasma as a result of neon seeding of an L-mode discharge. Correspondingly, confinement is improved and cross-field ion thermal transport reduced. Fully saturated turbulence in the range 0.1<=k_⊥ρ_s<=0.6 is measured at ρ = 0.7 and exhibits a factor of 5 reduction in total power after neon injection, with almost complete suppression for k_⊥ρ_s>0.35. These observations are consistent with a reduction in the calculated linear growth rate for k_⊥ρ_s>0.5 and an increase in the measured E×B flow shearing rate.

Original language	English
Pages (from-to)	1922-1925
Number of pages	4
Journal	Physical Review Letters
Volume	84
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.84.1922
State	Published - Feb 28 2000
Externally published	Yes

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10.1103/PhysRevLett.84.1922

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abstract = "Turbulence is significantly reduced in a tokamak plasma as a result of neon seeding of an L-mode discharge. Correspondingly, confinement is improved and cross-field ion thermal transport reduced. Fully saturated turbulence in the range 0.1<=k⊥ρs<=0.6 is measured at ρ = 0.7 and exhibits a factor of 5 reduction in total power after neon injection, with almost complete suppression for k⊥ρs>0.35. These observations are consistent with a reduction in the calculated linear growth rate for k⊥ρs>0.5 and an increase in the measured E×B flow shearing rate.",

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AU - Murakami, M.

AU - Staebler, G.

AU - Thomas, D.

AU - West, P.

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AB - Turbulence is significantly reduced in a tokamak plasma as a result of neon seeding of an L-mode discharge. Correspondingly, confinement is improved and cross-field ion thermal transport reduced. Fully saturated turbulence in the range 0.1<=k⊥ρs<=0.6 is measured at ρ = 0.7 and exhibits a factor of 5 reduction in total power after neon injection, with almost complete suppression for k⊥ρs>0.35. These observations are consistent with a reduction in the calculated linear growth rate for k⊥ρs>0.5 and an increase in the measured E×B flow shearing rate.

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Impurity-Induced Suppression of Core Turbulence and Transport in the DIII-D Tokamak

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