TITLE

Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks

AUTHOR(S)
Shaing, K. C.; Cahyna, P.; Becoulet, M.; Park, J.-K.; Sabbagh, S. A.; Chu, M. S.
PUB. DATE
August 2008
SOURCE
Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p082506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
It is demonstrated that the pitch angle integrals in the transport fluxes in the ν regime calculated in K. C. Shang [Phys. Plasmas 10, 1443 (2003)] are divergent as the trapped-circulating boundary is approached. Here, ν is the collision frequency. The origin of this divergence results from the logarithmic dependence in the bounce averaged radial drift velocity. A collisional boundary layer analysis is developed to remove the singularity. The resultant pitch angle integrals now include not only the original physics of the ν regime but also the boundary layer physics. The transport fluxes, caused by the particles inside the boundary layer, scale as ν.
ACCESSION #
34169236

 

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