  The analysis of experimental investigations of equilibrium, interaction and
dynamics of vortex structures in pure electron and gas-discharge electron
nonneutral plasmas during the time much more than the electron-neutral
collision time has been carried out. The problem of long confinement of the
column of pure electron plasma in Penning-Malmberg trap is considered. The
mechanism of stability of long-lived vortex structure in gas-discharge
nonneutral electron plasma is investigated. The collapse of electron sheath in
gas-discharge nonneutral electron plasma in Penning cell at high pressures of
neutral gas is described. The interaction between the stable vortex structure
and the annular electron sheath, and the action of vortex structures on the
transport of electrons along and across the magnetic field are discussed.
