Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks

Ker-Chung Shaing, P. Cahyna, M. Becoulet, J. K. Park, S. A. Sabbagh, M. S. Chu

Research output: Contribution to journalArticle

55 Citations (Scopus)

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.

Original languageEnglish
Article number082506
JournalPhysics of Plasmas
Volume15
Issue number8
DOIs
Publication statusPublished - 2008 Sep 8

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toroidal plasmas
boundary layers
pitch (inclination)
viscosity
physics
divergence
collisions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Shaing, Ker-Chung ; Cahyna, P. ; Becoulet, M. ; Park, J. K. ; Sabbagh, S. A. ; Chu, M. S. / Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks. In: Physics of Plasmas. 2008 ; Vol. 15, No. 8.
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Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks. / Shaing, Ker-Chung; Cahyna, P.; Becoulet, M.; Park, J. K.; Sabbagh, S. A.; Chu, M. S.

In: Physics of Plasmas, Vol. 15, No. 8, 082506, 08.09.2008.

Research output: Contribution to journalArticle

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