Main Magnetic Focus Ion Trap, new tool for trapping of highly charged   ions
  It is proposed to produce the highly charged ions in the local ion trap formed by a rippling electron beam in the focusing magnetic field. The experimental results demonstrate the presence of iridium ions with charges up to 50+. According to estimates, the average electron current density in the local ion trap can reach the value of the order of 10 kA/cm^2. The pilot examples of devices of this type with the electron beam energies within the range 3-10 keV are also presented. 
V. P. Ovsyannikov
physics.plasm-ph physics.acc-ph physics.atom-ph