Radiofrequency current drive in tokamak plasmas in the presence of trapped electrons is investigated. The appropriate response function, allowing the current drive efficiency, J/P, to be expressed by a simple analytical formula, is evaluated. It is shown that a significant degradation of the current generated away from the plasma axis is to be expected for methods relying on perpendicular diffusion only, even for appreciably high resonant parallel velocities.
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G. Giruzzi (1987) studied this question.
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