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in subjects: "Field-Reversed Configurations"  
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Kinetic Effects on the Stability Properties of Field-reversed Configurations: I. Linear Stability

Description: New computational results are presented which advance the understanding of the stability properties of the Field-Reversed Configuration (FRC). We present results of hybrid and two-fluid (Hall-MHD) simulations of prolate FRCs. The n = 1 tilt instability mechanism and growth rate reduction mechanisms are investigated in detail including resonant particle effects, finite Larmor radius and Hall stabilization, and profile effects. It is shown that the Hall effect determines the mode rotation and the… more
Date: January 28, 2003
Creator: Belova, Elena V.; Davidson, Ronald C.; Ji, Hantao & Yamada, Masaaki
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical Study of the Formation, Ion Spin-up and Nonlinear Stability Properties of Field-reversed Configurations

Description: Results of three-dimensional numerical simulations of field-reversed configurations (FRCs) are presented. Emphasis of this work is on the nonlinear evolution of magnetohydrodynamic (MHD) instabilities in kinetic FRCs and the new FRC formation method by the counter-helicity spheromak merging. Kinetic simulations show nonlinear saturation of the n = 1 tilt mode, where n is the toroidal mode number. The n = 2 and n = 3 rotational modes are observed to grow during the nonlinear phase of the tilt in… more
Date: November 12, 2004
Creator: Belova, E. V.; Davidson, R. C.; Ji, H.; Yamada, M.; Cothran, C. D.; Brown, M. R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical Study of Field-reversed Configurations: The Formation and Ion Spin-up

Description: Results of three-dimensional numerical simulations of field-reversed configurations (FRCs) are presented. Emphasis of this work is on the nonlinear evolution of magnetohydrodynamic (MHD) instabilities in kinetic FRCs, and the new FRC formation method by counter-helicity spheromak merging. Kinetic simulations show nonlinear saturation of the n = 1 tilt mode, where n is the toroidal mode number. The n = 2 and n = 3 rotational modes are observed to grow during the nonlinear phase of the tilt insta… more
Date: June 6, 2005
Creator: Belova, E. V.; Davidson, R. C.; Ji, H.; Yamada, M.; Cothran, C. D.; Brown, M. R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kinetic Effects on the Stability Properties of Field-reversed Configurations: II. Nonlinear Evolution

Description: Results of three-dimensional hybrid simulations of the field-reversed configuration (FRC) are presented. Emphasis of this work is on the nonlinear evolution of magnetohydrodynamic (MHD) instabilities in kinetic FRCs. A wide range of ''bar s'' values is considered, where the ''bar s'' is the FRC kinetic parameter, which measures the number of ion gyroradii in the configuration. The linear and nonlinear stability of MHD modes with toroidal mode numbers n greater than or equal to 1 is investigated… more
Date: November 25, 2003
Creator: Belova, Elena V.; Davidson, Ronald C.; Ji, Hantao & Yamada, Masaaki
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nonlinear and Non-ideal Effects on FRC Stability

Description: New computational results are presented which advance the understanding of the stability properties of the Field-Reversed Configuration (FRC). We present results of hybrid and two-fluid (Hall-MHD) simulations of prolate FRCs in strongly kinetic and small-gyroradius, MHD-like regimes. The n = 1 tilt instability mechanism and stabilizing factors are investigated in detail including nonlinear and resonant particle effects, particle losses along the open field lines, and Hall stabilization. It is s… more
Date: October 21, 2002
Creator: Belova, E. V.; Davidson, R. C.; Ji, H. & Yamada, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Onset and Saturation of Ion Heating by Odd-parity Rotating-magnetic-fields in a Field-reversed Configuration

Description: Heating of figure-8 ions by odd-parity rotating magnetic fields (RMFο) applied to an elongated field-reversed configuration (FRC) is investigated. The largest energy gain occurs at resonances (s ≡ ω(sub)R⁄ω) of the RMFο frequency, ω(sub)R, with the figure-8 orbital frequency, ω, and is proportional to s^2 for s – even resonances and to s for s – odd resonances. The threshold for the transition from regular to stochastic orbits explains both the onset and saturation of heating. The FRC magnetic … more
Date: November 1, 2005
Creator: A.S. Landsman, S.A. Cohen, A.H. Glasser
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Resonance and Chaotic Trajectories in Magnetic Field Reversed Configuration

Description: The nonlinear dynamics of a single ion in a field-reversed configuration (FRC) were investigated. FRC is a toroidal fusion device which uses a specific type of magnetic field to confine ions. As a result of angular invariance, the full three-dimensional Hamiltonian system can be expressed as two coupled, highly nonlinear oscillators. Due to the high nonlinearity in the equations of motion, the behavior of the system is extremely complex, showing different regimes, depending on the values of the… more
Date: April 13, 2005
Creator: Landsman, A. S.; Cohen, S. A.; Edelman, M. & Zaslavsky, G. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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