Charge breeding experiment of stable ion beams in EBIS charge breeder for RAON facility

Abstract

The Electron Beam Ion Source (EBIS) charge breeder is used to produce highly charged ions in the Isotope Separation On-Line (ISOL) system of the Rare isotope Accelerator complex for ON-line experiments (RAON). Beam tests of the EBIS are performed using stable Cs and Sn ion beams. 133Cs1+ ions from a test ion source were injected into the EBIS to measure the breeding effect with the electron beam. The resulting relative abundance of 133Cs27+ was 25.0%, and the extraction energy was 49.3 keV/q. A charge breeding test of the 120Sn ions from the Target Ion Source (TIS) of the ISOL system was also carried out. The charge fraction of 120Sn24+ was 23.0%, and the energy was 50 keV/q. These results fulfilled the input beam condition of the RFQ accelerator (A/q < 6 and 10 keV/u). Additionally, 133Cs27+ ions were extracted with a pulse length up to 10 ms (FWHM) by the preliminary pulse-stretching experiment.