Experimental Evidence on Inward Momentum Pinch on JET and Comparison with Theory and Modelling

Experiments have been carried out on the Joint European Torus (JET) tokamak to determine the diffusive and convective momentum transport. Torque, injected by neutral beams, was modulated to create a periodic perturbation in the toroidal rotation velocity. Novel transport analysis shows the magnitude and profile shape of the momentum diffusivity is similar to those of the ion heat diffusivity. A significant inward momentum pinch, up to 20m/s, has been found. Both results are consistent with recent developments in momentum transport theory and gyro-kinetic simulations. This evidence is complemented in plasmas with internal transport barriers.
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