Dynamo effect and current drive due to magnetic fluctuations in sheared magnetic field

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Abstract
It is shown that when the mean electromotive force in a plasma is evaluated in terms of the two‐point correlation of driven magnetic field fluctuations (as would be appropriate for problems related to current drive by waves), there is no β effect; i.e., the terms associated with gradients of the mean field vanish. The relevance of this result to the problem of current drive is discussed.