Abstract
A consistent picture of the mode conversion (MC) process at the ion–ion hybrid resonance in a bounded plasma of a tokamak is discussed, which clarifies the role of the global fast wave interference and cavity effects in the determination of the MC efficiency. This picture is supported by simulations with the kinetic code “VICE” [Fraboulet et al., “One-D full-wave description of plasma emission and absorption in the Ion Cyclotron Range of Frequency in tokamaks,” submitted to Phys. Plasmas]. The concept of the “global resonator,” formed by the R=n∥2 boundary cutoffs [Saoutic et al., Phys. Rev. Lett. 76, 1647 (1996)], is justified, as well as the importance of a proper tunneling factor choice ηcr=0.22 [Ram et al., Phys. Plasmas 3, 1976 (1996)]. The MC scheme behavior appears to be very sensitive to the MC layer position relative to the global wave field pattern. Optimal MC regimes are found to be attainable without requirement of a particular parallel wave number choice.
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