Spontaneous rotation sources in a quiescent tokamak edge plasma
- Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States) and Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Korea 3050701
- Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States)
Spontaneous rotation sources in a quiescent tokamak edge plasma are studied without an external momentum source, such as, beam injected or wall-born neutrals. Discussions are based upon example neoclassical solutions from an edge gyrokinetic particle code. The main study is performed in a DIII-D plasma [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] with the ion Grad-B drift directed toward the single-null divertor. Comparison with a reversed Grad-B drift case is also shown. It is found that there is a robust spontaneous co-current toroidal plasma rotation source in the far scrape-off plasma due to the wall sheath effect. As the edge pedestal width becomes narrower, the co-current rotation in the far scrape-off becomes weaker, but there appears a stronger co-current rotation in the pedestal top/shoulder from the X-point orbit loss effect, possibly providing a co-rotation boundary condition to the core plasma. Reversal of the magnetic field and plasma current brings down the overall co-rotation, especially in the far scrape-off plasma.
- OSTI ID:
- 21120444
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 6; Other Information: DOI: 10.1063/1.2937116; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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