Electron plasma behavior during autoresonant dioctron excitation

A novel multicell Penning-Malmberg trap is currently being studied as a way to trap and store up to $10^{12}$ positrons using kV confinement potentials.\footnote{Danielson, Weber, Surko, {\it Phys. Plasmas} {\bf 13}, 123502 (2006).}$^,$\footnote{Danielson, Hurst, Surko, AIP Conf. Proc. {\bf 1521}, 101 (2013).} A test structure has been constructed to conduct preliminary experiments. It consists of a large diameter ``master'' cell and four smaller diameter ``storage'' cells, three of which are off-axis. To load the multicell trap, plasma in the master cell is moved off-axis to radial displacements $D \gg r_p$, where $r_p$ is the plasma radius, before being transferred axially into off-axis storage cells. Details of the radial transfer process, which relies upon the autoresonant excitation of the dioctron mode,\footnote{Fajans, Gilson, Friedland, {\it Phys. Rev. Lett.} {\bf 82}, 4444 (1999).} will be discussed, as well as the plasma behavior during the axial transfer process.\footnote{Hurst, Danielson, Baker, Surko, {\it Phys. Rev. Lett.}, {\bf 113} 025004 (2014).}