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The linear stability of electrostatic drift waves in three-dimensional helical advanced stellarator (Helias) configurations is investigated. Effects of local geometrical properties and optimization due to reduction of Pfirsch–Schlüter currents on drift waves are discussed in a comparative numerical study for various configurations of Helias stellarators. The ballooning mode representation is used both for a basic approach with arbitrary nonadiabaticity and perturbatively for the more realistic dissipative trapped electron regime. Mode number spectra and linear growth rates are obtained with an eigenvalue code for three-dimensional equilibria. Local shear properties are found to have considerable influence on stability.
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Kendl et al. (1999) studied this question.
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