Abstract
It is shown that poloidal polarization of the plasma during ion cyclotron resonance heating (ICRH) can provide the source of free energy for excitation of the geodesic acoustic mode (GAM). A rough estimate for the threshold rf electric field amplitude necessary for GAM instability is given by νQL∕νi>q−3, where νQL is the rate of ICRH-induced quasilinear diffusion in velocity space, νi is the ion collision rate, and q is the safety factor.
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