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Equilibrium and power balance constraints on a quasi-static, ohmically-heated FRC

Description: In present experiments, FRC's (field-reversed configurations) are generated on dynamic time scales using pulsed high-power theta-pinch technology, which does not easily extrapolate to reactor-size devices. The attractiveness of FRC reactor scenarios would be enhanced by the development of quasi-static (i.e. formation time >> Alfven time) formation techniques requiring moderate power levels. In this report the quasi-static formation of FRC plasmas is analytically investigated. The set of equations which yield the time evolution of the ohmically-heated-plasa parameters, under the constraints of radial equilibrium and plasma energy losses, are presented. Subject to the simplifying assumptions used in the model, this equation set is completely general and would apply to any ohmically-heated FRC. A sample calculation is presented in which the FRC azimuthal current, I/sub theta/, is generted by the rotating-magnetic-field (RMF) technique.
Date: January 1, 1981
Creator: McKenna, K.F.; Rej, D.J. & Tuszewski, M.
Partner: UNT Libraries Government Documents Department

Initial reversed-field pinch experiments on ZT-40 and recent advances in RFP theory

Description: The ZT-40 reversed-field pinch (RFP) has been operated in several modes: (1) without reversed toroidal field, (2) with self reversal, and (3) with aided reversal. An analytic ohmic heating and ignition model both confirm and provide guidance for transport codes. Nondissipative formation schemes have been analyzed and ideal MHD stable evolution and burn scenarios have been found. Particle and fluid simulations have produced qualitative agreement with respect to the nonlinear behavior of m = 0 resistive g-modes. Helical ohmic reversed field states are produced by a 2-D dynamical simulation, and nonlinear analytic work describes the final state. A fast resistive MHD code for linear stability has clarified the relations between several kinds of resistive instabilities. Ballooning modes and g-modes in systems with arbitrary magnetic shear including resistivity and viscosity, have been studied in a unified treatment with growth rate vs wavenumber showing the existence of important cutoffs.
Date: January 1, 1980
Creator: Baker, D.A.; Buchenauer, C.J. & Burkhardt, L.C.
Partner: UNT Libraries Government Documents Department