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- W1983753996 abstract "We propose to utilize a high--phase-velocity wave driven indirectly within the plasma via a nonlinear interaction of two high-frequency pump waves in order to improve the efficiency of rf current drive as compared to the one induced by lower-hybrid waves. The use of this wave can be advantageously combined with a lower-hybrid wave having a slower phase velocity to generate a stochastic band in phase space due to a nonlinear interaction of resonances which results in a raised plateau in the electron velocity distribution function, leading to the generation of a current in the plasma. The threshold for onset of stochasticity is evaluated for the relativistic motion of electrons in a two--electrostatic-wave system and the dynamics of the electrons in this configuration is described through a generalized relativistic Fokker-Planck equation, the solution of which enables a prediction of the efficiency ratio J/${P}_{d}$. The efficiency of generating the beat wave itself is estimated and the constraints on the radiation sources needed for its production are considered. The dependency of the J/${P}_{d}$ ratio on the parameters of the system is investigated. The advantages of this current-drive scheme as compared to the scheme constrained by the accessibility conditions are discussed." @default.
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- W1983753996 date "1985-06-01" @default.
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- W1983753996 title "Employment of plasma beat waves in stochastic current drive" @default.
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- W1983753996 doi "https://doi.org/10.1103/physreva.31.3846" @default.
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