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Nonlinear coupling of tearing fluctuations in the Madison Symmetric Torus

Description: Three-wave, nonlinear, tearing mode coupling has been measured in the Madison Symmetric Torus (MST) reversed-field pinch (RFP) [Fusion Technol. 19, 131 (1991)] using bispectral analysis of edge magnetic fluctuations resolved in ``k-space. The strength of nonlinear three-wave interactions satisfying the sum rules m{sub 1} + m{sub 2} = m{sub 3} and n{sub 1} + n{sub 2} = n{sub 3} is measured by the bicoherency. In the RFP, m=l, n{approximately}2R/a (6 for MST) internally resonant modes are linearl… more
Date: November 1, 1992
Creator: Sarff, J. S.; Almagri, A. F.; Cekic, M.; Den Hartog, D. J.; Fiksel, G.; Hokin, S. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Current density fluctuations, nonlinear coupling, and transport in MST

Description: New information on magnetic fluctuations and transport in toroidal devices has been obtained in the MST reversed field pinch through measurement of nonlinear coupling of three waves in k-space, and measurement of current density fluctuations. Measurements of nonlinear coupling of magnetic fluctuations reveals that (1) two poloidal mode number m = 1 modes couple strongly to an m = 2 mode, (2) toroidal mode coupling is broad extending up to n = 20, (3) these features agree with predictions for te… more
Date: September 1, 1992
Creator: Prager, S. C.; Almagri, A. F.; Assadi, S.; Cekic, M.; Chapman, B. E.; Crocker, N. et al.
Partner: UNT Libraries Government Documents Department
open access

Nonlinear Coupling of Tearing Fluctuations in the Madison Symmetric Torus

Description: Three-wave, nonlinear, tearing mode coupling has been measured in the Madison Symmetric Torus (MST) reversed-field pinch (RFP) [Fusion Technol. 19, 131 (1991)] using bispectral analysis of edge magnetic fluctuations resolved in k-space. The strength of nonlinear three-wave interactions satisfying the sum rules m[sub 1] + m[sub 2] = m[sub 3] and n[sub 1] + n[sub 2] = n[sub 3] is measured by the bicoherency. In the RFP, m=l, n[approximately]2R/a (6 for MST) internally resonant modes are linearly … more
Date: November 1, 1992
Creator: Sarff, J. S.; Almagri, A. F.; Cekic, M.; Den Hartog, D. J.; Fiksel, G.; Hokin, S. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Current density fluctuations, nonlinear coupling, and transport in MST

Description: New information on magnetic fluctuations and transport in toroidal devices has been obtained in the MST reversed field pinch through measurement of nonlinear coupling of three waves in k-space, and measurement of current density fluctuations. Measurements of nonlinear coupling of magnetic fluctuations reveals that (1) two poloidal mode number m = 1 modes couple strongly to an m = 2 mode, (2) toroidal mode coupling is broad extending up to n = 20, (3) these features agree with predictions for te… more
Date: September 1, 1992
Creator: Prager, S. C.; Almagri, A. F.; Assadi, S.; Cekic, M.; Chapman, B. E.; Crocker, N. et al.
Partner: UNT Libraries Government Documents Department
open access

Global Stability of the Field Reversed Configuration

Description: New computational results are presented which provide a theoretical basis for the stability of the Field Reversed Configuration (FRC). The FRC is a compact toroid with negligible toroidal field in which the plasma is confined by a poloidal magnetic field associated with toroidal diamagnetic current. Although many MHD modes are predicted to be unstable, FRCs have been produced successfully by several formation techniques and show surprising macroscopic resilience. In order to understand this dis… more
Date: November 15, 2000
Creator: Belova, E. V.; Jardin, S. C.; Ji, H.; Kulsrud, R. M.; Park, W. & Yamada, M.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Dynamo Effect in a Plasma

Description: A series of the detailed experiments has been conducted in three laboratory plasma devices to measure the dynamo electric field along the equilibrium field line (the {alpha} effect) arising from the correlation between the fluctuating flow velocity and magnetic field. The fluctuating flow velocity is obtained from probe measurement of the fluctuating E x B drift and electron diamagnetic drift. The three major findings are (1) the {alpha} effect accounts for the dynamo current generation, even i… more
Date: November 1, 1995
Creator: Ji, H.; Prager, S. C.; Almagri, A. F.; Sarff, J. S.; Hirano, Y. & Toyama, H.
Partner: UNT Libraries Government Documents Department
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