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- W1988547102 abstract "The results of a theoretical study of nonlinear coupling of waves in the ion cyclotron range of frequencies (ICRF) to tokamak dissipative trapped electron modes (DTEM) via sidebands of the ICRF source wave are presented. These interactions can affect the stability of the DTEM spectrum and thus tokamak energy confinement. Explicit expressions are derived for the nonlinear growth rates of DTEM both for fast magnetosonic and ion Bernstein source waves. Fast wave coupling is found to be destabilizing for frequencies in the ICRF at low plasma ion beta, but can be stabilizing for wave frequencies well above the ion gyrofrequency (ω0≳ωciβ−1/2i). Ion Bernstein coupling can also be stabilizing or destabilizing depending on details of the source wave. Waves with ω0>ωci, k0>k, and k0 ρi≳1 appear better suited for stabilization (k0, k are the wavenumbers of the source wave, DTEM). For example, if these conditions are met and 2k0y<k (k0y is the poloidal source wavenumber), it is shown that the whole DTEM spectrum for kρi <1 can be stabilized. Analytic expressions for the ICRF wave electric field strengths for DTEM stabilization are given." @default.
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- W1988547102 date "1988-01-01" @default.
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- W1988547102 title "Nonlinear coupling of waves in the ion cyclotron range of frequencies to tokamak trapped electron modes" @default.
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- W1988547102 doi "https://doi.org/10.1063/1.866561" @default.
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