Response to “Comment on ‘Turbulent equipartition theory of toroidal momentum pinch’ ” [Phys. Plasmas 16, 034703 (2009)]

Hahm, T.S.; Diamond, P. H.; Gürcan, Özgür; Rewoldt, G.

doi:10.1063/1.3096714

Cited by 8 publications

(11 citation statements)

References 8 publications

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“…( (4) The physical picture of parallel momentum pinch described in this paper is related to the Stokes-Einstein flux driven by the Lorentz force generated by the magnetic drift, which is different from the previous understanding by invoking the Coriolis force [8][9][10][11]. Note the fact that the Coriolis force is in a rotating frame, it does not exist in the laboratory frame, however, the radial transport fluxes should not be changed by simply switching from the laboratory frame [9,11] to a toroidally-rotating frame [8,10]. Note that the Lorentz force proposed here is independent of the choice of reference frame.…”

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confidence: 81%

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Anomalous pinch of turbulent plasmas driven by the magnetic-drift-induced Lorentz force through the Stokes-Einstein relation

Wang

2016

Physics of Plasmas

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confidence: 81%

“…A parallel momentum pinch due to the Coriolis force in a toroidally-rotating frame was proposed by using the fluid model to analyze the quasilinear transport induced by the ion temperature gradient mode [8]. However, the effects of density gradient and Coriolis force have not been resolved in the momentum pinch theory [9][10][11].…”

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confidence: 99%

Anomalous pinch of turbulent plasmas driven by the magnetic-drift-induced Lorentz force through the Stokes-Einstein relation

Wang

2016

Physics of Plasmas

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“…comparing the ExFC simulation results with those from gyrokinetic theories and codes, including linear growth rate and frequency of electrostatic ITG and residual flow level in CBC profiles, where , growth rate and frequency versus compared with GTC and FULL cases [24] are shown in figure 1. There is good agreement among the three codes.…”

Section: Linear and Nonlinear Benchmark Of Exfcmentioning

confidence: 99%

Gyro-Landau-fluid simulations of impurity effects on ion temperature gradient driven turbulence transport

LIU 刘,

LI 李

2024

Plasma Sci. Technol.

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The impurity effects on ion temperature gradient (ITG) driven turbulence transport in tokamak core plasmas are investigated numerically via global simulations of microturbulence with carbon impurities and adiabatic electrons using extended fluid code (ExFC) based on a four-field gyro-Landau-fluid (GLF) model. The multispecies form of the normalized GLF equations guaranteeing self-consistent evolution of both bulk ions and impurities is presented. With parametric profiles of the cyclone base case (CBC), well-benchmarked ExFC is employed to perform simulations focusing on different impurity density profiles. For fixed temperature profile, it is found that the turbulent heat diffusivity of bulk ions in quasi-steady state is usually lower than that without impurity, which is contrary to the linear and quasi-linear predictions. The evolutions of the temperature gradient and heat diffusivity exhibit a fast relaxation process, indicating that the destabilization of the outwardly peaked impurity profile is a transient state response. Furthermore, the impurity effects of different profiles can obviously influence the nonlinear critical temperature gradient, which are likely to be dominated by linear effects. These results may evidence the plasma confinement improvement by the impurities probably through adjusting both heat diffusivity and critical temperature gradient.

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“…The FBW effect can be added to Eqs. ( 7) and ( 8) by a so-called banana-orbit-average (or bounceaverage) method borrowed from the bounce-kinetic theory [21,22] . The bounce-kinetic theory is a reduced kinetic description of plasma dynamics based on the existence of the second adiabatic invariant corresponding to the bounce motion of trapped particles.…”

Section: Fbw Effect On Neoclassical Polarization Currentmentioning

confidence: 99%

Effect of Finite-Ion-Banana-Width on the Polarization Contribution to the Neoclassical Tearing Modes Evolution

Hongpeng¹,

Peng²,

Yong³

et al. 2014

Plasma Sci. Technol.

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In the previous analytical description of the neoclassical polarization current effect on the neoclassical tearing modes (NTMs), it is usually assumed that the magnetic island is much larger than the finite-ion-banana-width (FBW). This assumption is questionable when the experimentally observed seed island width of the NTMs is comparable to the FBW. We introduce a simple and direct theoretical method to investigate the FBW effect on the neoclassical polarization contribution to the NTM evolution in collisional plasmas. The results show that, the FBW effect can strongly modify the neoclassical polarization current profile near the island separatrix, and thus weaken its probably stabilizing effect on the NTMs.

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Response to “Comment on ‘Turbulent equipartition theory of toroidal momentum pinch’ ” [Phys. Plasmas 16, 034703 (2009)]

Abstract: This response demonstrates that the comment by Peeters et al. contains an incorrect and misleading interpretation of our paper [T. S. Hahm et al., Phys. Plasmas 15, 055902 (2008)] regarding the density gradient dependence of momentum pinch and the turbulent equipartition theory.

Cited by 8 publications

References 8 publications

Anomalous pinch of turbulent plasmas driven by the magnetic-drift-induced Lorentz force through the Stokes-Einstein relation

Anomalous pinch of turbulent plasmas driven by the magnetic-drift-induced Lorentz force through the Stokes-Einstein relation

Gyro-Landau-fluid simulations of impurity effects on ion temperature gradient driven turbulence transport

Effect of Finite-Ion-Banana-Width on the Polarization Contribution to the Neoclassical Tearing Modes Evolution

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