Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas

L. Schmitz; A. E. White; T. A. Carter; W. A. Peebles; T. L. Rhodes; K. H. Burrell; W. Solomon; G. M. Staebler

doi:10.1103/PhysRevLett.100.035002

Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas

L. Schmitz, A. E. White, T. A. Carter, W. A. Peebles, T. L. Rhodes, K. H. Burrell, W. Solomon, G. M. Staebler

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

21 Scopus citations

Abstract

Core electron-temperature fluctuations [0.5%≤T e/Te≤2%, kθρs≤0.3 in neutral-beam-heated low confinement-mode (L-mode) plasmas] are observed to decrease by at least a factor of 4 in standard and quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-D tokamak (r/a=0.7). These fluctuations are attributed to ion temperature gradient (ITG) modes stabilized by rotational shear at the H-mode transition. The simultaneous reduction in electron heat diffusivity (χeQH/χeL<0.25) suggests that T e fluctuations can contribute significantly to L-mode electron heat transport.

Original language	English
Article number	035002
Journal	Physical Review Letters
Volume	100
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.100.035002
State	Published - Jan 23 2008
Externally published	Yes

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title = "Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas",

abstract = "Core electron-temperature fluctuations [0.5%≤T e/Te≤2%, kθρs≤0.3 in neutral-beam-heated low confinement-mode (L-mode) plasmas] are observed to decrease by at least a factor of 4 in standard and quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-D tokamak (r/a=0.7). These fluctuations are attributed to ion temperature gradient (ITG) modes stabilized by rotational shear at the H-mode transition. The simultaneous reduction in electron heat diffusivity (χeQH/χeL<0.25) suggests that T e fluctuations can contribute significantly to L-mode electron heat transport.",

author = "L. Schmitz and White, {A. E.} and Carter, {T. A.} and Peebles, {W. A.} and Rhodes, {T. L.} and Burrell, {K. H.} and W. Solomon and Staebler, {G. M.}",

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doi = "10.1103/PhysRevLett.100.035002",

language = "English",

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T1 - Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas

AU - Schmitz, L.

AU - White, A. E.

AU - Carter, T. A.

AU - Peebles, W. A.

AU - Rhodes, T. L.

AU - Burrell, K. H.

AU - Solomon, W.

AU - Staebler, G. M.

PY - 2008/1/23

Y1 - 2008/1/23

N2 - Core electron-temperature fluctuations [0.5%≤T e/Te≤2%, kθρs≤0.3 in neutral-beam-heated low confinement-mode (L-mode) plasmas] are observed to decrease by at least a factor of 4 in standard and quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-D tokamak (r/a=0.7). These fluctuations are attributed to ion temperature gradient (ITG) modes stabilized by rotational shear at the H-mode transition. The simultaneous reduction in electron heat diffusivity (χeQH/χeL<0.25) suggests that T e fluctuations can contribute significantly to L-mode electron heat transport.

AB - Core electron-temperature fluctuations [0.5%≤T e/Te≤2%, kθρs≤0.3 in neutral-beam-heated low confinement-mode (L-mode) plasmas] are observed to decrease by at least a factor of 4 in standard and quiescent high-confinement-mode (H-mode and QH-mode) regimes in the DIII-D tokamak (r/a=0.7). These fluctuations are attributed to ion temperature gradient (ITG) modes stabilized by rotational shear at the H-mode transition. The simultaneous reduction in electron heat diffusivity (χeQH/χeL<0.25) suggests that T e fluctuations can contribute significantly to L-mode electron heat transport.

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DO - 10.1103/PhysRevLett.100.035002

M3 - Article

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

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ER -

Observation of reduced electron-temperature fluctuations in the core of H-mode plasmas

Abstract

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