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The n=2 rotational instability has been completely suppressed on translated field-reversed configurations (FRC’s) in the FRX-C/T device [Phys. Fluids 29, 852 (1986)] by the application of either helical or straight quadrupole fields. Quadrupole field thresholds approximately equal to 7% and 9% of the external confinement field are required for stabilization with straight and helical coils, respectively. Comparisons with linearized magnetohydrodynamic (MHD) theory and 2 1/2 -dimensional hybrid simulations are made. The influence of quadrupoles on translation and plasma confinement is also reported.
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Rej et al. (1986) studied this question.
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