Abstract
The beta and magnetic field profiles of field-reversed configurations (FRC’s) can be inferred from the radial profile of the line-integral density together with a temperature model. When these profiles are combined with the particle and flux decay times, the plasma resistivities at the field null and separatrix can also be deduced. This method is applied to a class of FRC’s formed in the FRX-C/LSM device [in Proceedings of the Seventh US–Japan Workshop on Compact Toroid Research, 1985 (Spectra Technology, Inc., Bellevue, WA, 1985), p. 33; in Plasma Physics and Controlled Nuclear Fusion Research, 1986 (IAEA, Vienna, 1986), Vol. 2, p. 673]. The inferred beta profile shows an average beta that is larger than expected for elongated FRC equilibria in a straight coil, indicating that the FRC equilibrium is influenced by the mirror fields at the ends of the coil. The resistivity at the separatrix is consistent with classical plus lower hybrid drift resistivity, while the resistivity at the field null is anomalous and larger than that at the separatrix by about a factor of 3.
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