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Physics of Plasmas / Volume 4 / Issue 9
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Phys. Plasmas 4, 3230 (1997); http://dx.doi.org/10.1063/1.872465 (13 pages)

Bootstrap current and neoclassical transport in tokamaks of arbitrary collisionality and aspect ratio

W. A. Houlberg1, K. C. Shaing2, S. P. Hirshman1, and M. C. Zarnstorff3

1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
2Institute for Fusion Studies, The University of Texas, Austin, Texas 78712
3Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543

(Received 12 February 1997; accepted 17 June 1997)

A multi-species fluid model is described for the steady state parallel and radial force balance equations in axisymmetric tokamak plasmas. The bootstrap current, electrical resistivity, and particle and heat fluxes are evaluated in terms of the rotation velocities and friction and viscosity coefficients. A recent formulation of the neoclassical plasma viscosity for arbitrary shape and aspect ratio (including the unity aspect ratio limit), arbitrary collisionality, and orbit squeezing from strong radial electric fields is used to illustrate features of the model. The bootstrap current for the very low aspect ratio National Spherical Torus Experiment [J. Spitzer et al., Fusion Technol. 30, 1337 (1996)] is compared with other models; the largest differences occur near the plasma edge from treatment of the collisional contributions. The effects of orbit squeezing on bootstrap current, thermal and particle transport, and poloidal rotation are illustrated for an enhanced reverse shear plasma in the Tokamak Fusion Test Reactor [D. Meade and the TFTR Group, Plasma Physics and Controlled Nuclear Fusion Research, 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. I, p. 9]. Multiple charge states of impurities are incorporated using the reduced ion charge state formalism for computational efficiency. Because the force balance equations allow for inclusion of external momentum and heat sources and sinks they can be used for general plasma rotation studies while retaining the multi-species neoclassical effects. © 1997 American Institute of Physics.

© 1997 American Institute of Physics

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KEYWORDS and PACS

Keywords

plasma transport processes, plasma toroidal confinement, plasma collision processes, plasma theory, TOKAMAK DEVICES, NEOCLASSICAL TRANSPORT THEORY, BOOTSTRAP CURRENT, ELECTRIC CONDUCTIVITY, HEAT FLUX, ASPECT RATIO, ROTATING PLASMA, PLASMA SIMULATION, COLLISIONAL PLASMA

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.872465

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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