Current drive by plasma waves and helicity conservation

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Abstract
The connection between current drive by plasma waves and helicity conservation is discussed. The mean current drive depends on the difference between the viscous and resistive damping whereas the helicity input depends on the sum of the damping rates. The discrepancy is due to the helicity lost through flucutating currents. In a purely resistive plasma this loss is twice the helicity input and the helicity used in current drive is equal but opposite to the input.

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