Field reversed configuration experiments

Field reversed configurations with equilibrium separatrix radii up to 0.18 m have been formed and studied in FRX-C/LSM. For best formation conditions at low fill pressure, the particle confinement exceeds the predictions of LHD transport calculations by up to a factor of two; however, the inferred flux confinement is more anomalous than in smaller FRCs. Higher bias field produces axial shocks and degradation in confinement, while higher fill pressure results in gross fluting during formation. Field reversed configurations have been formed in TRX with s from 2 to 6. These relatively collisional FRCs exhibit the flux lifetimes of 10-20 kinetic growth times for the internal tilt mode. The coaxial slow source has produced annular FRCs in a coaxial coil geometry on slow time scales using low voltages. (author). 16 refs, 4 figs, 1 tab