The Experts below are selected from a list of 232386 Experts worldwide ranked by ideXlab platform
H Sugama - One of the best experts on this subject based on the ideXlab platform.
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a reduced model for Ion Temperature gradient turbulent transport in helical plasmas
Physics of Plasmas, 2013Co-Authors: M Nunami, T H Watanabe, H SugamaAbstract:A novel reduced model for Ion Temperature gradient (ITG) turbulent transport in helical plasmas is presented. The model enables one to predict nonlinear gyrokinetic simulatIon results from linear gyrokinetic analyses. It is shown from nonlinear gyrokinetic simulatIons of the ITG turbulence in helical plasmas that the transport coefficient can be expressed as a functIon of the turbulent fluctuatIon level and the averaged zonal flow amplitude. Then, the reduced model for the turbulent Ion heat diffusivity is derived by representing the nonlinear turbulent fluctuatIons and zonal flow amplitude in terms of the linear growth rate of the ITG instability and the linear response of the zonal flow potentials. It is confirmed that the reduced transport model is in a good agreement with nonlinear gyrokinetic simulatIon results for high Ion Temperature plasmas in the large helical device.
F L Hinton - One of the best experts on this subject based on the ideXlab platform.
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poloidal flow driven by Ion Temperature gradient turbulence in tokamaks
Physical Review Letters, 1998Co-Authors: M N Rosenbluth, F L HintonAbstract:We show that linear collisIonless processes do not damp poloidal flows driven by Ion-Temperature-gradient (ITG) turbulence. Since these flows play an important role in saturating the level of the turbulence, this level, as well as the transport caused by ITG modes, may be overestimated by gyrofluid simulatIons, which employ linear collisIonless rotatIon damping. {copyright} {ital 1998} {ital The American Physical Society}
C Clark - One of the best experts on this subject based on the ideXlab platform.
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Probing the edge Ion Temperature by passive Doppler spectroscopy in the TJ-II stellarator
Journal of Physics B: Atomic Molecular and Optical Physics, 2010Co-Authors: R J Peláez, B Zurro, A Baciero, D Rapisarda, C ClarkAbstract:We report on the measurement of the edge Ion Temperature in TJ-II plasmas, heated by electron cyclotron waves and neutral beam injectIon, using passive spectroscopy of impurity Ions in low IonizatIon stages. The measurements, which provide both temporal and some spatial resolutIon, offer some advantages over more intrusive or more sophisticated methods. The capabilities and limitatIons of this approach are illustrated by showing typical results obtained in conditIons of interest for fusIon plasmas. B Peláez et al, Probing the edge Ion Temperature by passive Doppler spectroscopy in the TJ-II... 2 1.
M Nunami - One of the best experts on this subject based on the ideXlab platform.
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a reduced model for Ion Temperature gradient turbulent transport in helical plasmas
Physics of Plasmas, 2013Co-Authors: M Nunami, T H Watanabe, H SugamaAbstract:A novel reduced model for Ion Temperature gradient (ITG) turbulent transport in helical plasmas is presented. The model enables one to predict nonlinear gyrokinetic simulatIon results from linear gyrokinetic analyses. It is shown from nonlinear gyrokinetic simulatIons of the ITG turbulence in helical plasmas that the transport coefficient can be expressed as a functIon of the turbulent fluctuatIon level and the averaged zonal flow amplitude. Then, the reduced model for the turbulent Ion heat diffusivity is derived by representing the nonlinear turbulent fluctuatIons and zonal flow amplitude in terms of the linear growth rate of the ITG instability and the linear response of the zonal flow potentials. It is confirmed that the reduced transport model is in a good agreement with nonlinear gyrokinetic simulatIon results for high Ion Temperature plasmas in the large helical device.
M N Rosenbluth - One of the best experts on this subject based on the ideXlab platform.
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poloidal flow driven by Ion Temperature gradient turbulence in tokamaks
Physical Review Letters, 1998Co-Authors: M N Rosenbluth, F L HintonAbstract:We show that linear collisIonless processes do not damp poloidal flows driven by Ion-Temperature-gradient (ITG) turbulence. Since these flows play an important role in saturating the level of the turbulence, this level, as well as the transport caused by ITG modes, may be overestimated by gyrofluid simulatIons, which employ linear collisIonless rotatIon damping. {copyright} {ital 1998} {ital The American Physical Society}
