A three-field model to study drift-resistive, low-frequency waves in low-beta, non-axisymmetric plasmas (J.L.V. Lewandowski, Phys. Plasmas, 4 (11) 4023 (1997)) is used to analyze the effect of the inhomogeneities in the stellarator magnetic field on the fastest (linear) growth rate, gamma.Extensive numerical calculations for a toroidal heliac show that not all Fourier components in the representation of the equilibrium configuration are important as far as gamma is concerned.
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