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2014_lukin_epr_talk.pdf2014-08-07 08:49:46Vyacheslav Lukin

Simulations of turbulent magnetic relaxation and merging in the Swarthmore Spheromak Experiment wind tunnel

Author: Vyacheslav Lukin
Requested Type: Consider for Invited
Submitted: 2014-05-30 19:18:47

Co-authors: D. A. Schaffner, M. R. Brown

Contact Info:
US Naval Research Laboratory
4555 Overlook Ave. SW
Washington, DC   20375
USA

Abstract Text:
Simulations of the wind tunnel configuration of the Swarthmore Spheromak Experiments (SSX) have been performed within the HiFi multi-fluid modeling framework using the compressible Hall MHD fluid approximation of the magnetized plasma and a parametrized model of plasma-wall interactions in the form of particle losses and recycling. The simulations are initialized in highly non-equilibrium configurations with either a single spheromak at one end of the wind tunnel, or with two spheromaks of same or opposite helicity at both ends of the wind tunnel. The majority of the plasma chamber is initialized under near-vacuum field-free conditions. Both the global dynamics and the spectra of wave activity during relaxation, as well as merging in the cases with two initial spheromaks, have been characterized and compared to the SSX experimental measurements. The similarities and differences between the corresponding measures in experiments and simulations for the three different initial magnetic configurations will be discussed.

Characterization: 2.0

Comments:

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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