Target-ion source unit ionization efficiency measurement by a method of stable ion beam implantation
Petersburg Nuclear Physics Institute RAS, Leningrad district, 188350 Gatchina, Russia
Published online: 8 December 2007
At the IRIS facility a rather precise method of the target-ion source unit ionization efficiency measurement has been developed. The method exploits an off-line mass-separator for the implantation of the ion beams of selected stable isotopes into a tantalum foil placed inside a Faraday cup in the focal plane of the mass-separator. After the implantation of the required amount of the investigated species, tantalum foil has been inserted into the volume of the target-ion source unit prepared for the on-line utilization at the IRIS on-line separator. The first tests have ensured the ionization efficiency values (90±10)% for Rb and (85±10)% for Cs in the empty combined target-ion source unit, which was used as a reference one. For the target-ion source unit with UC target material inside the measured value of the ionization efficiency of Rb was (52±20)%.
PACS: 28.60.+S – Isotope separation and enrichment / 29.25.Ni – Ion sources: positive and negative / 29.25.Rm – Sources of radioactive nuclei
© EDP Sciences, Springer-Verlag, 2007