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The linear stability of electrostatic drift waves in three-dimensional helical advanced stellerator configurations is investigated. Effects of local geometrical properties and optimization due to reduction of Pfirsch-Schluter currents on drift waves are discussed in a comparative numerical study for various configurations of Helias stellerators. The ballooning mode representation is used both for a basic approach with arbitrary nonadiabacity 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 equilibrium. Local shear properties are found to have considerable influence on stability.

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Authors: KENDL A, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);WOBIG H, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Physics of Plasmas, 6 (1999)12, 4714-4721
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