NIFS-484

FULL TEXT (PDF, 403 KB)


Author(s):

T. Ohkawa

Title:

Reduction of Turbulence by Sheared Toroidal Flow on a Flux Surface

Date of publication:

Feb. 1997

Key words:

sheared toroidal flow, turbulence suppression, energetic ions, anomalous transport, confinement improvement, negative magnetic shear

Abstract:

When the tokamak plasma is heated by neutral beam injection, the pressure of the high energy ions is generally not uniform on a flux surface. The distribution depends on the injection geometry. The response of the electrons, described by Ohm's law results in the sheared toroidal rotation of the plasma on a flux surface. Because the turbulence has long correlation lengths parallel to the magnetic field, the rotational shear on a flux surface is more effective for suppressing the turbulences with short radial correlation length than the rotational shear across the flux surface.

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