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approvedsherwoodabs17.pdf2017-03-16 17:48:19Chris Hegna

Abstracts

Author: Chris C Hegna
Requested Type: Poster
Submitted: 2017-03-16 17:47:22

Co-authors: P. W. Terry, B. J. Faber

Contact Info:
University of WIsconsin-Madison
1500 Engineering Drive
Madison, WI   53706
USA

Abstract Text:
A three field fluid model is developed to describe ion temperature gradient turbulent saturation
processes in stellarators. The theory relies on the paradigm of zonal flow catalyzed transfer of
energy from unstable to damped modes as the dominant saturation mechanism. The model allows
for generally 3D equilibrium geometry. The nonlinear saturation process is controlled by a triplet
correlation lifetime that is determined by a three-wave frequency mismatch associated with an
instability, a stable mode and a zonal flow. This triplet correlation time can be used as a proxy
in optimization procedures for improving turbulent transport in stellarators. Preliminary estimates
indicate that quasi-helically symmetric devices have an advantage with regard
to turbulent saturation physics relative to other stellarator configurations.

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