Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D

A. E. White; L. Schmitz; W. A. Peebles; T. L. Rhodes; T. A. Carter; G. R. McKee; M. W. Shafer; G. M. Staebler; K. H. Burrell; J. C. Deboo; R. Prater

doi:10.1063/1.3318469

Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D

A. E. White, L. Schmitz, W. A. Peebles, T. L. Rhodes, T. A. Carter, G. R. McKee, M. W. Shafer, G. M. Staebler, K. H. Burrell, J. C. Deboo, R. Prater

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

27 Scopus citations

Abstract

New measurements show that long-wavelength (k_θ ρ _s <0.5) electron temperature fluctuations can play an important role in determining electron thermal transport in low-confinement mode (L-mode) tokamak plasmas. In neutral beam-heated L-mode tokamak plasmas, electron thermal transport and the amplitude of long-wavelength electron temperature fluctuations both increase in cases where local electron cyclotron heating (ECH) is used to modify the plasma profiles. In contrast, the amplitude of simultaneously measured long-wavelength density fluctuations does not significantly increase. Linear stability analysis indicates that the ratio of the trapped electron mode (TEM) to ion temperature gradient (ITG) mode growth rates increases in the cases with ECH. The increased importance of the TEM drive relative to the ITG mode drive in the cases with ECH may be associated with the increases in electron thermal transport and electron temperature fluctuations.

Original language	English
Article number	020701
Journal	Physics of Plasmas
Volume	17
Issue number	2
DOIs	https://doi.org/10.1063/1.3318469
State	Published - 2010
Externally published	Yes

Funding

This work was supported in part by the U.S. Department of Energy under Contract Nos. DE-AC05-06IR23100, DE-FG03-01ER54615, DE-FG02-89ER53296, and DE-FC02-04ER54698. A.E.W. thanks M. E. Austin for ECE analysis, C. C. Petty for error analysis discussions, R. J. Groebner for CER analysis, M. A. Makowski for MSE and EFIT analysis, and the entire DIII-D team for their support of these experiments.

Funders	Funder number
U.S. Department of Energy

UN SDGs

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White, A. E., Schmitz, L., Peebles, W. A., Rhodes, T. L., Carter, T. A., McKee, G. R., Shafer, M. W., Staebler, G. M., Burrell, K. H., Deboo, J. C., & Prater, R. (2010). Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D. Physics of Plasmas, 17(2), Article 020701. https://doi.org/10.1063/1.3318469

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title = "Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D",

abstract = "New measurements show that long-wavelength (kθ ρ s <0.5) electron temperature fluctuations can play an important role in determining electron thermal transport in low-confinement mode (L-mode) tokamak plasmas. In neutral beam-heated L-mode tokamak plasmas, electron thermal transport and the amplitude of long-wavelength electron temperature fluctuations both increase in cases where local electron cyclotron heating (ECH) is used to modify the plasma profiles. In contrast, the amplitude of simultaneously measured long-wavelength density fluctuations does not significantly increase. Linear stability analysis indicates that the ratio of the trapped electron mode (TEM) to ion temperature gradient (ITG) mode growth rates increases in the cases with ECH. The increased importance of the TEM drive relative to the ITG mode drive in the cases with ECH may be associated with the increases in electron thermal transport and electron temperature fluctuations.",

author = "White, {A. E.} and L. Schmitz and Peebles, {W. A.} and Rhodes, {T. L.} and Carter, {T. A.} and McKee, {G. R.} and Shafer, {M. W.} and Staebler, {G. M.} and Burrell, {K. H.} and Deboo, {J. C.} and R. Prater",

year = "2010",

doi = "10.1063/1.3318469",

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AU - White, A. E.

AU - Schmitz, L.

AU - Peebles, W. A.

AU - Rhodes, T. L.

AU - Carter, T. A.

AU - McKee, G. R.

AU - Shafer, M. W.

AU - Staebler, G. M.

AU - Burrell, K. H.

AU - Deboo, J. C.

AU - Prater, R.

PY - 2010

Y1 - 2010

N2 - New measurements show that long-wavelength (kθ ρ s <0.5) electron temperature fluctuations can play an important role in determining electron thermal transport in low-confinement mode (L-mode) tokamak plasmas. In neutral beam-heated L-mode tokamak plasmas, electron thermal transport and the amplitude of long-wavelength electron temperature fluctuations both increase in cases where local electron cyclotron heating (ECH) is used to modify the plasma profiles. In contrast, the amplitude of simultaneously measured long-wavelength density fluctuations does not significantly increase. Linear stability analysis indicates that the ratio of the trapped electron mode (TEM) to ion temperature gradient (ITG) mode growth rates increases in the cases with ECH. The increased importance of the TEM drive relative to the ITG mode drive in the cases with ECH may be associated with the increases in electron thermal transport and electron temperature fluctuations.

AB - New measurements show that long-wavelength (kθ ρ s <0.5) electron temperature fluctuations can play an important role in determining electron thermal transport in low-confinement mode (L-mode) tokamak plasmas. In neutral beam-heated L-mode tokamak plasmas, electron thermal transport and the amplitude of long-wavelength electron temperature fluctuations both increase in cases where local electron cyclotron heating (ECH) is used to modify the plasma profiles. In contrast, the amplitude of simultaneously measured long-wavelength density fluctuations does not significantly increase. Linear stability analysis indicates that the ratio of the trapped electron mode (TEM) to ion temperature gradient (ITG) mode growth rates increases in the cases with ECH. The increased importance of the TEM drive relative to the ITG mode drive in the cases with ECH may be associated with the increases in electron thermal transport and electron temperature fluctuations.

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JO - Physics of Plasmas

JF - Physics of Plasmas

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Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D

Abstract

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