Neoclassical ion transport in the edge of axially-symmetric arbitrary cross-section tokamak with plasma subsonic toroidal flows
نویسندگان
چکیده
منابع مشابه
Neoclassical Ion Transport in the Edge of Axially - Symmetric Arbitrary Cross - Section Tokamak with Plasma
The theoretical and experimental study of the neoclassical ion transport in edge tokamak plasmas are nowadays of renewed interest. 4 In particular, these studies are important in the so-called H-regimes in large toroidal facilities, characterized by sharp gradients in the radial pro les of macroscopic plasma quantities in the region of the transport barriers. Plasmas of small tokamaks, which pl...
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We present a numerical and analytic assessment of the transport in two quasi-axially symmetric stellarators, including one variant of the MHH2 class[l] of such devices, and a configuration we refer t o as NHH2, closely related t o MHH2. Monte Carlo simulation results are compared with expectations from established stellarator neoclassical theory, and with some empirical stellarator scalings, us...
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The interaction of passing-ion drift orbits with spatially inhomogeneous but purely diffusive radial transport is demonstrated to cause spontaneous toroidal spin-up in a simple model of the tokamak edge. Physically, major-radial orbit shifts cause orbit-averaged diffusivities to depend on v(∥), including its sign, leading to residual stress. The resulting pedestal-top intrinsic rotation scales ...
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Abstract: In this paper, we establish existence of global subsonic and subsonic-sonic flows through infinitely long axially symmetric nozzles by combining variational method, various elliptic estimates and a compensated compactness method. More precisely, it is shown that there exist global subsonic flows in nozzles for incoming mass flux less than a critical value; moreover, uniformly subsonic...
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It has recently been reported that ion thermal transport levels in enhanced confinement tokamak plasmas have been observed to fall below the "irreducible minimum level" predicted by standard neoclassical theory. This apparent contradiction is resolved in the present analysis by relaxing the basic neoclassical assumption that the ions orbital excursions are much smaller than the local toroidal m...
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ژورنال
عنوان ژورنال: Brazilian Journal of Physics
سال: 2002
ISSN: 0103-9733
DOI: 10.1590/s0103-97332002000100003