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Simulation of Spheromak Evolution and Energy Confinement

Description: Simulation results are presented that illustrate the formation and decay of a spheromak plasma driven by a coaxial electrostatic plasma gun, and that model the energy confinement of the plasma. The physics of magnetic reconnection during spheromak formation is also illuminated. The simulations are performed with the three-dimensional, time-dependent, resistive magnetohydrodynamic NIMROD code. The dimensional, simulation results are compared to data from the SSPX spheromak experiment at the Lawr… more
Date: November 12, 2004
Creator: Cohen, B; Hooper, E; Cohen, R; Hill, D; McLean, H; Wood, R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Numerical Investigation of Transients in the SSPX Spheromak

Description: Nonlinear simulations of plasma discharges in the Sustained Spheromak Physics Experiment demonstrate the role of transient effects in establishing a toroidal magnetic structure that confines internal energy. The magnetohydrodynamics-based model includes collisional anisotropic thermal energy transport and temperature-dependent electrical resistivity that are realistic for the open-field regions of the plasma. The modeling shows that while dynamo activity is responsible for generating net poloid… more
Date: October 13, 2004
Creator: Sovinec, C; Cohen, B; Cone, G; Hooper, E & McLean, H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Deuterium Experiments in the Sustained Spheromak Physics Experiment

Description: In this paper we report on the results of isotope exchange experiments in the Sustained Spheromak Physics Experiment (SSPX). We have compared {approx}500 deuterium discharges with similar discharges in hydrogen. Typically, we produce plasmas with peak toroidal currents in the range of 0.6 MA, electron temperatures (T{sub e}) of {approx}200 eV and energy confinement times ({tau}{sub E}) of {approx}200 {micro}s. The D{sub 2} fueled discharges show similar results to those with H{sub 2} fueling wi… more
Date: May 24, 2004
Creator: Wood, R; Hill, D N; Hooper, E; McLean, H; Ryutov, D & Woodruff, S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simulation of Spheromak Evolution and Energy Confinement

Description: Simulation results are presented that illustrate the formation and decay of a spheromak plasma driven by a coaxial electrostatic plasma gun, and that model the energy confinement of the plasma. The physics of magnetic reconnection during spheromak formation is also illuminated. The simulations are performed with the three-dimensional, time-dependent, resistive magnetohydrodynamic NIMROD code. The simulation results are compared to data from the SSPX spheromak experiment at the Lawrence Livermor… more
Date: November 9, 2004
Creator: Cohen, B; Hooper, E; Cohen, R; Hill, D; McLean, H; Wood, R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling the Effects of (lambda)-gun on SSPX Operation: Mode Spectra, Internal Magnetic Field Structure, and Energy Confinement

Description: The Sustained Spheromak Physics Experiment (SSPX) shows considerable sensitivity to the value of the injected (''gun'') current, I{sub gun}, parameterized by the relative values of {lambda}{sub gun} = {mu}{sub 0}I{sub gun}/{Psi}{sub gun} (with {Psi}{sub gun} the bias poloidal magnetic flux) to the lowest eigenvalue of {del} x B = {lambda}{sub FC}B in the flux conserver geometry. This report discusses modeling calculations using the NIMROD resistive-MHD code in the SSPX geometry. The behavior is… more
Date: August 23, 2005
Creator: Hooper, E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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