Physics – Plasma Physics
Scientific paper
2006-07-24
Phys. Plasmas 14, 010704 (2007)
Physics
Plasma Physics
4 pages, 4 figures
Scientific paper
10.1063/1.2435319
The effect of a narrow sub-Alfvenic shear flow layer near the minimum q_min of the tokamak safety factor profile in a configuration with reversed central shear is analyzed. Sufficiently strong velocity shear gives rise to a broad spectrum of fast growing Kelvin-Helmholtz (KH)-like ideal magnetohydrodynamic (MHD) modes with dominant mode numbers m,n ~ 10. Nonlinear simulations with finite resistivity show magnetic reconnection near ripples caused by KH-like vortices, the formation of turbulent structures, and a flattening of the flow profile. The KH modes are compared to double tearing modes (DTM) which dominate at lower shearing rates. The possible application of these results in tokamaks with internal transport barrier is discussed.
Bierwage Andreas
Günter Sibylle
Yu Qingquan
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