Stability and transport of parallel velocity shear driven mode with negative magnetic shear

Stability of the ion-temperature-gradient-driven mode with negative magnetic shear

Electrostatic Ion-cyclotron Waves Driven by Parallel Velocity Shear

Using a fluid treatment, it is shown that electrostatic waves with angular frequencies ~ ωci (ion cyclotron frequency) propagating at large angles to the ambient magnetic field can be excited in a magnetized plasma by perpendicular shear in the magnetic field aligned plasma flow. The role of density gradients in determining the stability of sheardriven EIC modes is also considered. PACS numbers...

REVIEW ARTICLES Effects of E3B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices*

One of the scientific success stories of fusion research over the past decade is the development of the E3B shear stabilization model to explain the formation of transport barriers in magnetic confinement devices. This model was originally developed to explain the transport barrier formed at the plasma edge in tokamaks after the L ~low! to H ~high! transition. This concept has the universality ...

On ion temperature gradient and parallel velocity shear instabilities

The local dispersion relation for waves with frequencies in the range of the diamagnetic frequencies v j * and parallel wave numbers satisfying the conditions k ics /ve*;1 and qRk i@1 has been obtained in the framework of kinetic theory keeping the equilibrium density, temperature, and parallel velocity gradients into account ( j is the species index, qR the connection length, and cs the speed ...

Core Transport Reduction in Tokamak Plasmas with Modified Magnetic Shear

Spontaneous improvements of plasma confinement during auxiliary heating have been observed in many tokamaks when the q profile has been modified from its normal resistive equilibrium so that q > 1 and the magnetic shear is reduced or reversed in a region near the magnetic axis. The effects on the overall plasma confinement result from the formation in the plasma interior of transport barriers, ...