Phys. Rev. Lett. 99, 035002 (2007) [4 pages]Nonlinear Gyrokinetic Simulations of Ion-Temperature-Gradient Turbulence for the Optimized Wendelstein 7-X StellaratorReceived 5 April 2007; published 20 July 2007 Ion-temperature-gradient turbulence constitutes a possibly dominant transport mechanism for optimized stellarators, in view of the effective suppression of neoclassical losses characterizing these devices. Nonlinear gyrokinetic simulation results for the Wendelstein 7-X stellarator [G. Grieger et al., in Proceedings of the IAEA Conference on Plasma Physics and Controlled Nuclear Fusion Research, 1990 (IAEA, Vienna, 1991) Vol. 3, p. 525]—assuming an adiabatic electron response—are presented. Several fundamental features are discussed, including the role of zonal flows for turbulence saturation, the resulting flux-gradient relationship, and the coexistence of ion-temperature-gradient modes with trapped ion modes in the saturated state. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.035002
DOI:
10.1103/PhysRevLett.99.035002
PACS:
52.65.Tt, 52.30.Gz, 52.35.Ra, 52.55.Hc
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