Turbulence and transport in mirror geometries in the LAPD

Measurements of turbulence and transport in varying magnetic mirror ratios, including multi-celled configurations, have been performed using the flexible magnetic geometry of the Large Plasma Device (LAPD).~Fluctuations in density (ion saturation current), floating potential, and magnetic field were recorded, with amplitudes peaking, as expected, on the edge pressure gradient. Planar correlation functions of single-celled mirror cases were also recorded. In a single-celled mirror, density and magnetic field fluctuation amplitudes decreased with increasing mirror ratio, while potential fluctuation amplitudes remained similar. The cross-phase between potential and density fluctuations varies with increasing mirror ratio, suggesting a shift in the underlying linear instability as the mirror ratio is increased and magnetic curvature is introduced. Differences in the~spectra and cross-phases of~floating potential and ion saturation current were also observed with increased cell count.~Swept Langmuir probe measurements, analyzed using neural-network-based machine learning techniques, will also be presented.