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Two-Fluid Simulations of Field-Reversed Configuration Rotation Control and Stability

Author: Ammar H Hakim
Requested Type: Poster Only
Submitted: 2011-06-10 16:07:53

Co-authors: J. Loverich

Contact Info:
Tech-X Corporation
5621 Arapahoe Avenue
Boulder, CO   80303
USA

Abstract Text:
We use Tech-X Corporation’s plasma fluid code, Nautilus, to understand FRC rotation mechanisms and means of controlling it. Rotational instabilities are the dominant mode of FRC disruption and controlling them can lead to longer confinement times required to achieve high temperatures. The simulations presented here are for pre-formed FRCs in 2D axisymmetric geometries. The physical model used is the non-neutral electromagnetic two-fluid model that allows the separate resolution of electron and ion dynamics.

The simulations are initialized with an ideal MHD equilibrium with the magnetic field determined from current flowing in poloidal field coils. The FRCs are allowed to relax and the rotation profile studied. The effect of end-shorting and viscous and resistive walls is investigated. In particular, electric field reduction is studied and the coupling of this to FRC rotation investigated. The ability to reduce the rotation via active control of the electric field is investigated.

Characterization: A7

Comments:

University of Washington

Workshop on Innovation in Fusion Science (ICC2011) and
US-Japan Workshop on Compact Torus Plasma
August 16-19, 2011
Seattle, Washington

ICC 2011