A negatively-sheared magnetic field is produced by making the plasma current distribution hollow. The safety factor then decreases from the center to a minimum near the plasma edge.

Fig. 2-2 Simulation results of plasma turbulence and magnetic shear

Dependence of magnitude of plasma turbulence on magnetic shear is calculated by particle simulation technique. In the plasma cross sections shown, less turbulence is observed in the negative shear case (c) compared to the positive shear cases (a) and (b).

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Persistent Quest - Research Activities 1997
Copyright(c) Japan Atomic Energy Research Institute