The generation of radial electric fields through radiofrequency has been investigated in a toroidal magnetized plasma without rotational transform. By launching different kinds of electrostatic waves the plasma profiles were modified and sheared electric fields were generated. Direct observation of sheared E × B flows driven by fluctuations via Reynolds stress at the resonance layer of ion Bernstein is reported. These experiments provide a new bridge between experimental measurements and theoretical models in understanding the underlying physics of improved confinement regimes using RF in magnetically confined plasmas.
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