# Plasma shaping effects on the geodesic acoustic mode in the large orbit drift width limit

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- Response to Schalit and Bellan. Miller, R. L.; Chan, V. S.; Ohkawa, T. // Physics of Fluids B: Plasma Physics;Dec89, Vol. 1 Issue 12, p2534
The ac helicity effect discussed by Schalit and Bellan does not impact the current drive efficiency obtained by Ohkawa.