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Department Library

2005

Marshall Hart (Senior Thesis, March 2005, Advisor: Grant Mason )

Abstract

n/a

1995

Jonathan A. Bennett (Honors Thesis, November 1995, Advisor: Grant Mason )

Abstract

1989

Philip L Matheson (PhD Dissertation, August 1989, Advisor: Grant Mason )

Abstract

Magnetic divertors have been shown to be successful in minimizing plasma-wall interactions and in leading to high confinement regimes in Tokamaks. This leads to the hope that similar benefits may occur in an Reversed-Field-Pinch (RFP) fitted with a divertor. Previous experiments using divertors in a RFP have used a poloidal field divertor configuration such as issued in Tokamaks. This study investigates another approach; namely a toroidal field divertor. In this study a simple model of a poloidally symmetric toroidal field divertor is developed and used in a study of stochastic effects due to the divertor and in a 3-D magnetohydrodynamic (MHD) code to study the response of the plasma to the large poloidal m=0 perturbations causes by the divertor coils. It is found that the topology of the RFP-diverter system is much more complex than had been expected. Stochasticity is enhanced in the outer edge region of the plasma because of this geometrical complexity. The way the RFP reaches equilibrium in this complex system is investigated with the 3-D relaxation code, “DEBS” (authored by Dalton Schnack). This code showed that the divertor will not hinder the formation of a reversed toroidal field in the plasma, and that the dynamics of its formation is altered when toroidal effects are considered. The plasma develops flows and currents in the throat of the divertor in response to the vacuum-like divertor fields. These flows and currents help to restore the force free character of the plasma.