Density Scaling Studies in Toroidal Electron Plasma and Upgrade Plans for the Lawrence Non-Neutral Torus II

Electron plasma is confined using a purely toroidal magnetic field ($R_{o}=$ 18 cm, $B <$ 550 G) for times ($\sim $500 ms) that are much longer than any of the dynamical timescales of the system. The Lawrence Non-Neutral Torus II (LNT II) can be operated as a partial torus in which plasma is confined in C-shaped toroidal sectors or as a fully toroidal, closed field trap. Electron density is controlled by adjusting the injector (filament) bias and by attempts to apply a ``rotating wall.'' Confinement and diocotron mode damping are measured by monitoring image charge on isolated wall sectors. High relative density ($>$10$^{7}$ cm$^{-3})$ fully toroidal plasma is also generated by placing the injector at the edge and gating the bias voltage. We also present plans to upgrade the magnetic field (to exceed 1 kG) and enhance the diagnostic capabilities of the LNT II to permit measurement of higher order modes. This work is supported by the National Science Foundation -- Award {\#}1202540.