Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

A. E. White; L. Schmitz; G. R. McKee; C. Holland; W. A. Peebles; T. A. Carter; M. W. Shafer; M. E. Austin; K. H. Burrell; J. Candy; J. C. Deboo; E. J. Doyle; M. A. Makowski; R. Prater; T. L. Rhodes; G. M. Staebler; G. R. Tynan; R. E. Waltz; G. Wang

doi:10.1063/1.2895408

Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

A. E. White
, L. Schmitz
, G. R. McKee
, C. Holland
, W. A. Peebles
, T. A. Carter
, M. W. Shafer
, M. E. Austin
, K. H. Burrell
, J. Candy
, J. C. Deboo
, E. J. Doyle
, M. A. Makowski
, R. Prater
, T. L. Rhodes
, G. M. Staebler
, G. R. Tynan
, R. E. Waltz
, G. Wang

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

109 Scopus citations

Abstract

For the first time, profiles (0.3<ρ <0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low confinement mode (L-mode) plasmas in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] are found to be similar in frequency and normalized amplitude, with amplitude increasing with radius. The measured radial profile of two fluctuation fields allows for a new and rigorous comparison with gyrokinetic results. Nonlinear gyrokinetic flux-tube simulations predict that electron temperature and density fluctuations have similar normalized amplitudes in L-mode. At ρ =0.5, simulation results match experimental heat diffusivities and density fluctuation amplitude, but overestimate electron temperature fluctuation amplitude and particle diffusivity. In contrast, simulations at ρ =0.75 do not match either the experimentally derived transport properties or the measured fluctuation levels.

Original language	English
Article number	056116
Journal	Physics of Plasmas
Volume	15
Issue number	5
DOIs	https://doi.org/10.1063/1.2895408
State	Published - 2008
Externally published	Yes

Funding

This research is supported by the U.S. Department of Energy under Contract Nos. DE-FG03-01ER54615, JP333701, DE-FG02-89ER53296, DE-FG02-04ER54758, DE-FC02-04ER54698, DE-FG03-97ER54415, and W-7405-ENG-48. A.E.W.’s research was performed under appointment to the Fusion Energy Sciences Fellowship Program administered by Oak Ridge Institute for Science and Education under a contract between the U.S. Department of Energy and the Oak Ridge Associated Universities. We thank the DIII-D team for their support of these experiments. A.E.W. is grateful to Steve Cowley for his many insightful comments and discussions of this work.

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White, A. E., Schmitz, L., McKee, G. R., Holland, C., Peebles, W. A., Carter, T. A., Shafer, M. W., Austin, M. E., Burrell, K. H., Candy, J., Deboo, J. C., Doyle, E. J., Makowski, M. A., Prater, R., Rhodes, T. L., Staebler, G. M., Tynan, G. R., Waltz, R. E., & Wang, G. (2008). Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations. Physics of Plasmas, 15(5), Article 056116. https://doi.org/10.1063/1.2895408

@article{1b2f1e178e5e407482c60b2ced0c0400,

title = "Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations",

abstract = "For the first time, profiles (0.3<ρ <0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low confinement mode (L-mode) plasmas in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] are found to be similar in frequency and normalized amplitude, with amplitude increasing with radius. The measured radial profile of two fluctuation fields allows for a new and rigorous comparison with gyrokinetic results. Nonlinear gyrokinetic flux-tube simulations predict that electron temperature and density fluctuations have similar normalized amplitudes in L-mode. At ρ =0.5, simulation results match experimental heat diffusivities and density fluctuation amplitude, but overestimate electron temperature fluctuation amplitude and particle diffusivity. In contrast, simulations at ρ =0.75 do not match either the experimentally derived transport properties or the measured fluctuation levels.",

author = "White, \{A. E.\} and L. Schmitz and McKee, \{G. R.\} and C. Holland and Peebles, \{W. A.\} and Carter, \{T. A.\} and Shafer, \{M. W.\} and Austin, \{M. E.\} and Burrell, \{K. H.\} and J. Candy and Deboo, \{J. C.\} and Doyle, \{E. J.\} and Makowski, \{M. A.\} and R. Prater and Rhodes, \{T. L.\} and Staebler, \{G. M.\} and Tynan, \{G. R.\} and Waltz, \{R. E.\} and G. Wang",

year = "2008",

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White, AE, Schmitz, L, McKee, GR, Holland, C, Peebles, WA, Carter, TA , Shafer, MW, Austin, ME, Burrell, KH, Candy, J, Deboo, JC, Doyle, EJ, Makowski, MA, Prater, R, Rhodes, TL, Staebler, GM, Tynan, GR, Waltz, RE & Wang, G 2008, 'Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations', Physics of Plasmas, vol. 15, no. 5, 056116. https://doi.org/10.1063/1.2895408

TY - JOUR

T1 - Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

AU - White, A. E.

AU - Schmitz, L.

AU - McKee, G. R.

AU - Holland, C.

AU - Peebles, W. A.

AU - Carter, T. A.

AU - Shafer, M. W.

AU - Austin, M. E.

AU - Burrell, K. H.

AU - Candy, J.

AU - Deboo, J. C.

AU - Doyle, E. J.

AU - Makowski, M. A.

AU - Prater, R.

AU - Rhodes, T. L.

AU - Staebler, G. M.

AU - Tynan, G. R.

AU - Waltz, R. E.

AU - Wang, G.

PY - 2008

Y1 - 2008

N2 - For the first time, profiles (0.3<ρ <0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low confinement mode (L-mode) plasmas in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] are found to be similar in frequency and normalized amplitude, with amplitude increasing with radius. The measured radial profile of two fluctuation fields allows for a new and rigorous comparison with gyrokinetic results. Nonlinear gyrokinetic flux-tube simulations predict that electron temperature and density fluctuations have similar normalized amplitudes in L-mode. At ρ =0.5, simulation results match experimental heat diffusivities and density fluctuation amplitude, but overestimate electron temperature fluctuation amplitude and particle diffusivity. In contrast, simulations at ρ =0.75 do not match either the experimentally derived transport properties or the measured fluctuation levels.

AB - For the first time, profiles (0.3<ρ <0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low confinement mode (L-mode) plasmas in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] are found to be similar in frequency and normalized amplitude, with amplitude increasing with radius. The measured radial profile of two fluctuation fields allows for a new and rigorous comparison with gyrokinetic results. Nonlinear gyrokinetic flux-tube simulations predict that electron temperature and density fluctuations have similar normalized amplitudes in L-mode. At ρ =0.5, simulation results match experimental heat diffusivities and density fluctuation amplitude, but overestimate electron temperature fluctuation amplitude and particle diffusivity. In contrast, simulations at ρ =0.75 do not match either the experimentally derived transport properties or the measured fluctuation levels.

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DO - 10.1063/1.2895408

M3 - Article

AN - SCOPUS:44649199803

SN - 1070-664X

VL - 15

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056116

ER -

Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

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