Abstract
Compact toroids (CT) containing both poloidal and toroidal magnetic field, spheromaks, are generated in the CTX experiment using a magnetized coaxial plasma gun, and are trapped and stably confined in an oblate flux conserver. Total configuration lifetimes are observed up to ∼ 0.8 ms, consistent with classical resistive decay. The field reversed configuration (FRC) is a high beta, axisymmetric, highly prolate compact toroid, containing only poloidal magnetic field, formed in a field-reversed theta pinch. A quiescent confinement period of 30 to 90 μs with T i ∼ 200–500 eV and n ∼ 5 × 10 15 cm −3 is terminated by an n = 2 rotational instability. The FRC is stable to MHD modes including the tilting instability.
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