A linear collisionless gyrokinetic investigation of ion temperature gradient (ITG) modes—considering both adiabatic and full electron dynamics—and trapped electron modes (TEMs) is presented for the stellarator Wendelstein 7-X (W7-X) [G. Grieger et al., Plasma Physics and Controlled Nuclear Fusion Research 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 3, p. 525]. The study of ITG modes reveals that in W7-X, microinstabilities of distinct character coexist. The effect of changes in the density gradient and temperature ratio is discussed. Substantial differences with respect to the axisymmetric geometry appear in W7-X, concerning the relative separation of regions with a large fraction of helically trapped particles and those of pronounced bad curvature. For both ITG modes and TEMs, the dependence of their linear growth rates on the background gradients is studied along with their parallel mode structure.
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April 2007
Research Article|
April 10 2007
Gyrokinetic analysis of linear microinstabilities for the stellarator Wendelstein 7-X Available to Purchase
P. Xanthopoulos;
P. Xanthopoulos
Max-Planck-Institut für Plasmaphysik
, Teilinstitut Greifswald, Wendelsteinstrasse 1, D-17491 Greifswald, Germany
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F. Jenko
F. Jenko
Max-Planck-Institut für Plasmaphysik
, Boltzmannstrasse 2, D-85748 Garching, Germany
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P. Xanthopoulos
F. Jenko
Max-Planck-Institut für Plasmaphysik
, Teilinstitut Greifswald, Wendelsteinstrasse 1, D-17491 Greifswald, GermanyPhys. Plasmas 14, 042501 (2007)
Article history
Received:
September 27 2006
Accepted:
February 02 2007
Citation
P. Xanthopoulos, F. Jenko; Gyrokinetic analysis of linear microinstabilities for the stellarator Wendelstein 7-X. Phys. Plasmas 1 April 2007; 14 (4): 042501. https://doi.org/10.1063/1.2714328
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