Abstract
We report the results of injecting 90 kW of microwave power near the lower hybrid frequency into the Alcator-$A$ tokamak through a two-waveguide array. The observed plasma heating is in disagreement with that expected from linear waveguide-plasma coupling theory. From these results and auxiliary rf probe measurements we infer the nonlinear formation of a high-${k}_{\ensuremath{\parallel}}$ wave power spectrum at the plasma edge.
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