Operational Characteristics of a Radial Extraction Ion Source with an Injected Electron Beam

An RF ion source on the radial extraction type is modified by introducing an electron gun to supply electrons which interact radially with the source's plasma, thereby increasing ionization density. A tungsten filanent is used with an accelerating electrode, under the influenice of axial magnetic field. Tvo plasma tubes have been tested with the samle tube lenigth (12 cms) and diameters 4&5 cms respectively. Glass-coated tungsten wires are immersed in the plasma as electrical probes. Two extraction electrodes of apertures 4 and 8 mm are used. lie extraction characteristics indicate l5% increase in the extracted ion beam.