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Drift wave test particle transport in reversed shear profile

Authors :
Philip J. Morrison
Hyoung-Bin Park
D. Stronzzi
D. I. Choi
Jae-Min Kwon
Wendell Horton
Publication Year :
1998
Publisher :
Office of Scientific and Technical Information (OSTI), 1998.

Abstract

Drift 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 x 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.

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........b10c847cfc2e076242b0734d9f6c936a
Full Text :
https://doi.org/10.2172/674816