NIFS-070

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Author(s):

K. Ida, H. Yamada, H. Iguchi, K. Itoh and CHS Group

Title:

Observation of Parallel Viscosity in the CHS Heliotron/Torsatron

Date of publication:

Jan. 1991

Key words:

Plasma flow, Viscosity, Heliotron/Torsatron

Abstract:

Damping of the toroidal velocity owing to parallel viscosity is observed in the plasma with a tangential neutral beam injection in the CHS Heliotron/Torsatron device. Toroidal velocity profile is dominated by the perpendicular viscosity when magnetic field modulation is weak near axis. However, the parallel viscosity is found to be dominant when the modulation is strong enough and to increase in proportion to the square of the modulation of magnetic field. The absolute values of the viscosity agree with the neoclassical prediction within a factor of three.

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