Results 221 to 230 of about 41,540 (235)

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
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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
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Internal Transport Barrier Triggered by Neoclassical Transport in W7-AS

Physical Review Letters, 2001
Physical Review ...
U. Stroth, K. Itoh, S.-I. Itoh, H. Hartfuss, H. Laqua, null the ECRH team, null the W7-AS team   +6 more
openaire   +3 more sources

Neoclassical transport considerations for advanced tokamaks

Nuclear Fusion, 1988
Interest in attaining high beta has stimulated the study of strongly shaped tokamak configurations. The influence of strong shaping on neoclassical transport, specifically on the ion thermal flux and the diffusion induced (or 'bootstrap') current, has been investigated.
C.O. Beasley, J.T. Hogan
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Attaining neoclassical transport in ignited tokamaks

Nuclear Fusion, 2000
The requirements to stabilize microinstabilities with velocity shear in tokamaks are examined for both aspect ratio A = 3 and A = 1.4. A comprehensive linear gyrokinetic code is used to compute growth rates in realistic numerical equilibria. Growth rates for A = 3 and A = 1.4 are generally similar for electron drift modes and ion temperature gradient ...
M Kotschenreuther, W Dorland, Q.P Liu, M.C Zarnstorff, R.L Miller, Y.R Lin-Liu   +5 more
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Neoclassical Transport Properties of Tokamak Plasmas

Fusion Science and Technology, 2004
The classical transport theory is strictly valid for a plasma in a homogeneous and stationary magnetic field. In the '60, experiments have shown that this theory does not apply as a local theory of transport in Tokamaks. It was shown that global geometric characteristics of the confining elements have a strong influence on the transport.
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NEOCLASSICAL TRANSPORT

1987
Frances Bauer, Octavio Betancourt, Paul Garabedian, Masahiro Wakatani   +3 more
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Relativistic effects in electron neoclassical transport

2015
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Marushchenko, I., Azarenkov, N.A.
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