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A theoretical study of parametric absorption in electron cyclotron resonance heating (ECRH) of tokamak plasmas is presented. The problem of primary and secondary decays including their temporal and spatial growth rates is studied. In the nonlinear phase of development of the excited waves, a cascading saturation mechanism is invoked for both convective and absolute instabilities. Anomalous absorption frequencies and anomalous absorption lengths are evaluated for a variety of parametric excitations.
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A. Bers (1984) studied this question.
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