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Neoclassical Transport in the Helical Reversed-Field Pinch
Physical Review Letters, 2010Test 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
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Internal Transport Barrier Triggered by Neoclassical Transport in W7-AS
Physical Review Letters, 2001Physical Review ...
U. Stroth +6 more
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Studies of the neoclassical transport for CNT
Plasma Physics and Controlled Fusion, 2007The original optimization of the Columbia Nonneutral Torus (CNT) considering only volume (and error field resilience) was also successful in optimizing the stored energy. To assess the general confinement properties of a device, studies of the 1/ν neoclassical transport (effective ripple eff) are important.
B Seiwald +3 more
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Neoclassical Transport Properties of Tokamak Plasmas
Fusion Science and Technology, 2004The 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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Thermodynamics of neoclassical and turbulent transport
Plasma Physics and Controlled Fusion, 2012A 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. +9 more
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Neoclassical ripple transport in tokamaks
Nuclear Fusion, 1982The 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
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Monte-Carlo simulation of neoclassical transport in stellarators
Nuclear Fusion, 1984Neoclassical transport coefficients are computed by Monte-Carlo simulation over a wide range of mean free paths in the approximation of small-gyroradius, mono-energetic-particle distribution, and vanishing electric field for several stellarator fields. Pfirsch-Schluter, plateau, and ripple transport coefficients are obtained. The transport coefficients
Dommaschk, W., Lotz, W., Nuehrenberg, J.
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Nonlinear neoclassical transport in toroidal edge plasmas
Physics of Plasmas, 2001In 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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Bifurcated neoclassical particle transport
Physics of Plasmas, 1998The 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.
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