Results 21 to 30 of about 158 (153)
Transport in gyrokinetic tokamaks [PDF]
Physics of Plasmas, 1995 A comprehensive study of transport in full-volume gyrokinetic (GK) simulations of ion temperature gradient driven turbulence in core tokamak plasmas is presented. Though this ‘‘gyrokinetic tokamak’’ is much simpler than experimental tokamaks, such simplicity is an asset, because a dependable nonlinear transport theory for such systems should be more ...
H. E. Mynick, S. E. Parker
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Isotope mass dependence of pedestal transport in JET H-mode plasmas
Nuclear Fusion, 2023 We present a comparative transport analysis of the isotope mass dependence in the pedestal of two pairs of deuterium/hydrogen type I ELMy H-mode discharges in JET with ITER-like wall, one characterized by the same input power, the other one by the same ...
I. Predebon +8 more
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Free Energy Cascade in Gyrokinetic Turbulence [PDF]
Physical Review Letters, 2011 In gyrokinetic theory, the quadratic nonlinearity is known to play an important role in the dynamics by redistributing (in a conservative fashion) the free energy between the various active scales. In the present study, the free energy transfer is analyzed for the case of ion temperature gradient driven turbulence.
Banon Navarro, Alejandro +6 more
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Quasilinear gyrokinetic theory: a derivation of QuaLiKiz [PDF]
Journal of Plasma Physics, 2021 In order to predict and analyse turbulent transport in tokamaks, it is important to model transport that arises from microinstabilities. For this task, quasilinear codes have been developed that seek to calculate particle, angular momentum and heat fluxes, both quickly and accurately.
C.D. Stephens +5 more
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Theory and modeling of electron fishbones
New Journal of Physics, 2016 Internal kink instabilities exhibiting fishbone like behavior have been observed in a variety of experiments where a high energy electron population, generated by strong auxiliary heating and/or current drive systems, was present. After briefly reviewing
G Vlad +5 more
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Nuclear Fusion, 2023 Multi-scale gyrokinetic theory and simulations of a toroidal magnetized plasma have revealed the existence of cross-scale interactions of the trapped electron mode (TEM) and the electron temperature gradient (ETG) turbulence.
T.-H. Watanabe, S. Maeyama, M. Nakata
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Journal of Plasma Physics, 2019 Thousands of gyrokinetic papers have been published since the introduction of the gyrokinetic change of variables. The intent here is not to review the field, but rather the goal is to present a tutorial providing insight into why gyrokinetics is an appropriate description of turbulent transport.
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Advances in stellarator gyrokinetics [PDF]
Nuclear Fusion, 2015 Recent progress in the gyrokinetic theory of stellarator microinstabilities and turbulence simulations is summarized. The simulations have been carried out using two different gyrokinetic codes, the global particle-in-cell code EUTERPE and the continuum code GENE, which operates in the geometry of a flux tube or a flux surface but is local in the ...
Helander, P. +7 more
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Linear signatures in nonlinear gyrokinetics: interpreting turbulence with pseudospectra
New Journal of Physics, 2016 A notable feature of plasma turbulence is its propensity to retain features of the underlying linear eigenmodes in a strongly turbulent state—a property that can be exploited to predict various aspects of the turbulence using only linear information.
D R Hatch +5 more
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Self-generated vortex flows in a tokamak magnetic island with a background flow
Nuclear Fusion, 2023 We present a gyrokinetic theory of self-generated E × B vortex flows in a magnetic island in a collisionless tokamak plasma with a background vortex flow.
G.J. Choi
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