First results from the Lawrence Non-neutral Torus II: a toroidal electron plasma device

Progress towards studying the dynamics of long-lived ($\sim$1 s) non-neutral plasmas in toroidal geometry will be presented. Achieving trapping times on the order of 1 second will permit study of higher order mode dynamics and inherently toroidal transport physics [1]. This poster presents the first results from the newly constructed Lawrence Non-Neutral Torus (LNT) II apparatus. The LNT II features an improved toroidal magnetic field magnitude ($\sim$ 0.5 kG) and base vacuum pressure ($<$10$^{-9}$ Torr). A segmented Au-plated Al electrode shell contributes to the reduction in field asymmetries and enables enhanced diagnostics. Additionally, the electron source is located on a retractable bellows for study of confinement dynamics in a complete torus. Confinement times on the order of 1 second would represent more than an order of magnitude improvement over measurements made with the previous apparatus [2].\\ $[1]$ S.M. Crooks and T. M. O'Neil, \textit{Phys. Plasmas} \textbf{3}, 2533 (1996)\\ $[2]$ M.R. Stoneking \textit{et al.} \textit{Phys. Rev. Lett.} \textbf{92}, 095003 (2004)