Results 251 to 260 of about 2,547,829 (287)

Synergy of turbulent and neoclassical transport through poloidal convective cells

Plasma Physics and Controlled Fusion, 2019
The role of poloidal convective cells—i.e. low frequency axisymmetric modes of the electric potential—on transport processes is studied with the full-F gyrokinetic code GYSELA.
Y. Asahi, V. Grandgirard, Y. Sarazin, P. Donnel, X. Garbet, Y. Idomura, G. Dif-Pradalier, G. Latu   +7 more
semanticscholar   +1 more source

Global calculation of neoclassical impurity transport including the variation of electrostatic potential

Journal of Plasma Physics, 2020
Recently, the validity range of the approximations commonly used in neoclassical calculation has been reconsidered. One of the primary motivations behind this trend is observation of an impurity hole in LHD (Large Helical Device), i.e.
K. Fujita, S. Satake, R. Kanno, M. Nunami, M. Nakata, J. M. García-Regaña, J. Velasco, I. Calvo   +7 more
semanticscholar   +1 more source

Neoclassical Transport Theory

Fusion Technology, 2000
SCOPUS: ar.j ; info:eu-repo/semantics ...
openaire   +1 more source

Neoclassical ripple transport in tokamaks

Nuclear Fusion, 1982
The usual ripple transport calculations lead to a ν−1 scaling of the transport coefficients with collision frequency ν. The paper extends and clarifies this scaling by taking into account the fact that the dominant contributions to transport come from particles in the high-energy tail of the distribution function.
K.C. Shaing, J.D. Callen
openaire   +1 more source

Non-ambipolar neoclassical transport

Nuclear Fusion, 1995
The usual demonstration that neoclassical transport is automatically ambipolar, and independent of the radial electric field (Er), is shown to be valid only in an equilibrium axisymmetric plasma in which there is no other source or damping of toroidal momentum.
openaire   +1 more source

Bifurcated neoclassical particle transport

Physics of Plasmas, 1998
The theory of neoclassical transport in an impure, toroidal plasma is extended to allow for steeper pressure and temperature gradients than are usually considered. It is found that the ion particle flux is a nonmonotonic function of these gradients for plasma parameters typical of the tokamak edge.
openaire   +1 more source

Neoclassical Transport in the Helical Reversed-Field Pinch

Physical Review Letters, 2010
Test particle evaluation of the diffusion coefficient in a fusion plasma in the reversed-field pinch (RFP) configuration shows distinct similarities with stellarators when the plasma spontaneously evolves towards a helical shape. The almost total absence of superbanana particles at the levels of helical deformation seen in experiment (Bh/B=10%) causes ...
Gobbin M, Spizzo G, Marrelli L, White R
openaire   +7 more sources

Nonlinear neoclassical transport in toroidal edge plasmas

Physics of Plasmas, 2001
In conventional neoclassical theory, the density and temperature gradients are not allowed to be as steep as frequently observed in the tokamak edge. In this paper the theory of neoclassical transport in a collisional, impure plasma is extended to allow for steeper profiles than normally assumed.
T. Fülöp, P. Helander
openaire   +1 more source

Drift-Kinetic Simulations of Neoclassical Transport

AIP Conference Proceedings, 2008
We present results from numerical studies of neoclassical transport for multi‐species plasmas. The code, NEO, provides a first‐principles based calculation of the neoclassical transport coefficients directly from solution of the distribution function by solving a hierarchy of equations derived by expanding the fundamental drift‐kinetic equation in ...
E. A. Belli, J. Candy, Olivier Sauter, Xavier Garbet, Elio Sindoni   +4 more
openaire   +1 more source

Thermodynamics of neoclassical and turbulent transport

Plasma Physics and Controlled Fusion, 2012
A variational principle based on the calculation of the entropy production rate is derived, which covers particle, momentum and heat transport. This principle is used to define proper thermodynamical forces and fluxes. When turbulent parallel wavenumbers are small, and fluctuations are ballooned, it is found that the forces are the gradients of density,
Garbet X., Abiteboul J., Strugarek A., Sarazin Y., Dif-Pradalier G., Ghendrih P., Grandgirard V., Bourdelle C., Latu G., Smolyakov A.   +9 more
openaire   +1 more source