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Measurements of the cross-phase angle between density and electron temperature fluctuations and comparison with gyrokinetic simulations

Author(s)
White, Anne E.; Peebles, W. A.; Rhodes, T. L.; Holland, C.; Wang, G.; Schmitz, L.; Carter, T. A.; Hillesheim, J. C.; Doyle, E. J.; Zeng, L.; McKee, G. R.; Staebler, G. M.; Waltz, R. E.; DeBoo, J. C.; Petty, C. C.; Burrell, K. H.; ... Show more Show less
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Abstract
This paper presents new measurements of the cross-phase angle, αneTe [alpha n subscript n subscript e T subscript e], between long-wavelength (kθρs<0.5) [k subscript theta p subscript s < 0.5)] density, n~e [n cedilla subscript e], and electron temperature, T~e [T cedilla subscript e], fluctuations in the core of DIII-D [ J. L. Luxon, Nucl. Fusion 42, 614 (2002) ] tokamak plasmas. The coherency and cross-phase angle between n~e [n cedilla subscript e] and T~e [T cedilla subscript e] are measured using coupled reflectometer and correlation electron cyclotron emission diagnostics that view the same plasma volume. In addition to the experimental results, two sets of local, nonlinear gyrokinetic turbulence simulations that are performed with the GYRO code [ J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003) ] are described. One set, called the pre-experiment simulations, was performed prior to the experiment in order to predict a change in αneTe [alpha n subscript n subscript e T subscript e] given experimentally realizable increases in the electron temperature, Te [T subscript e]. In the experiment the cross-phase angle was measured at three radial locations (ρ = 0.55, 0.65, and 0.75) in both a “Base” case and a “High Te [T subscript e] ” case. The measured cross-phase angle is in good qualitative agreement with the pre-experiment simulations, which predicted that n~e [n cedilla subscript e] and T~e [T cedilla subscript e] would be out of phase. The pre-experiment simulations also predicted a decrease in cross-phase angle as Te [T subscript e] is increased. Experimentally, this trend is observed at the inner two radial locations only. The second set of simulations, the postexperiment simulations, is carried out using local parameters taken from measured experimental profiles as input to GYRO. These postexperiment simulation results are in good quantitative agreement with the measured cross-phase angle, despite disagreements with transport fluxes. Directions for future modeling and experimental work are discussed.
Date issued
2010-03
URI
http://hdl.handle.net/1721.1/65841
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
Physics of Plasmas
Publisher
American Institute of Physics
Citation
White, A. E. et al. “Measurements of the Cross-phase Angle Between Density and Electron Temperature Fluctuations and Comparison with Gyrokinetic Simulations.” Physics of Plasmas 17.5 (2010) : 056103. © 2010 American Institute of Physics
Version: Final published version
ISSN
1070-664X
1089-7674

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