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Author: C. C. Hegna
Requested Type: Poster
Submitted: 2018-02-26 13:39:27

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

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

Abstract Text:
In this work, a five field fluid is developed to describe electromagnetic turbulence saturation processes in 3D geometry. This work is an extension of a previous calculation of ITG turbulent saturation processes in the electrostatic limit [1]. The theory employs a paradigm of nonlinear energy
transfer from unstable to damped modes at comparable wavelength as the dominant saturation mechanism. Nonlinear energy transfer is enabled by a third mode that primarily regulates the energy
transfer. Nonlinear energy transfer is quantified by the product of turbulent correlation lifetimes and a corresponding geometric coupling coefficient, both of which are functions of 3D shaping. Large values of this quantity indicate small saturated turbulence levels and lowered turbulent transport. The primary goal of this work is identify means by which 3D shaping can be used to alter nonlinear turbulent energy transfer and the associated change in turbulent transport.

[1] C. C. Hegna, P. W. Terry and B. J. Faber, Physics of Plasmas 25, 022511 (2018).

*Research supported by U. S. DoE under grants DE-FG02-99ER54546, DE-FG02-89ER53291 and DE-FG02-93ER54222.