Optimum Extraction From a CHORDIS by Pressure Variation

The influence of the working gas pressure on the extraction behavior of ion beams out of a cold or hot reflex discharge ion source was investigated using xenon ions in the energy range from 17 to 30 keV. Optimal extraction conditions were achieved by transmission measurements through a 90 doubly focusing dipole magnet. The measured currents obtained at the optimized transmission reproduce the Child-Langmuir equation. The results are compared with IGUN simulations of the extraction system.