A Secondary Ion Energy Analyzer for Measuring the Degree of Compensation of the Ion Beam Space Charge

This paper describes an analyzer of the energy of secondary slow ions, which is used to measure the degree of compensation of the spatial charge of a hydrogen ion beam in a low energy beam transport channel (LEBT) to the input of an accelerator with high-frequency quadrupole focusing. The electrostatic analyzer with a retarding field has increased accuracy due to the use of a double analyzing grid. The results of measuring the degree of compensation of the space charge of a hydrogen ion beam with a pulse current of 60 mA and an energy of 400 keV are presented. The analyzer also allows non-disturbing measurements of the radial size of the ion beam.