Transport theory for potato orbits in an axisymmetric torus with finite toroidal flow speed

Journal Article · Thu Jan 01 00:00:00 EST 2004 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1761536· OSTI ID:1081831

Shaing, K. C. ^[1]; Peng, Yueng Kay Martin ^[2]

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1. University of Wisconsin
2. ORNL

Transport theory for potato orbits in the region near the magnetic axis in an axisymmetric torus such as tokamaks and spherical tori is extended to the situation where the toroidal flow speed is of the order of the sonic speed as observed in National Spherical Torus Experiment [E. J. Synakowski, M. G. Bell, R. E. Bell et al., Nucl. Fusion 43, 1653 (2003)]. It is found that transport fluxes such as ion radial heat flux, and bootstrap current density are modified by a factor of the order of the square of the toroidal Mach number. The consequences of the orbit squeezing are also presented. The theory is developed for parabolic (in radius r) plasma profiles. A method to apply the results of the theory for the transport modeling is discussed.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1081831
• Journal Information: Physics of Plasmas, Vol. 11, Issue 8; ISSN 1070-664X
• Country of Publication: United States
• Language: English