Drift wave test particle transport in reversed shear profile
1998; American Institute of Physics; Volume: 5; Issue: 11 Linguagem: Inglês
10.1063/1.873110
ISSN1527-2419
AutoresW. Horton, Hyoung‐Bin Park, Jae-Min Kwon, D. J. Strozzi, P. Morrison, Duk‐In Choi,
Tópico(s)Ionosphere and magnetosphere dynamics
ResumoDrift wave maps, area preserving maps that describe the motion of charged particles in drift waves, are derived. The maps allow the integration of particle orbits on the long time scale needed to describe transport. Calculations using the drift wave maps show that dramatic improvement in the particle confinement, in the presence of a given level and spectrum of E×B turbulence, can occur for q(r) profiles with reversed shear. A similar reduction in the transport, i.e., one that is independent of the turbulence, is observed in the presence of an equilibrium radial electric field with shear. The transport reduction, caused by the combined effects of radial electric field shear and both monotonic and reversed shear magnetic q profiles, is also investigated.
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