Speaker
Description
The RAON ISOL (Isotope Separation On-Line) system has been in operation for rare isotope beam production since March 2023. In the early phase, surface-ionized beams of Li, Na, and Al were produced from a SiC target bombarded with a 70 MeV, 1 kW proton beam. The measurement of short-lived $^{24\mathrm{m}}$Na ($T_{1/2} = 20\mathrm{ms}$) demonstrated good release efficiency of the SiC target. Masses of $^{24,25}$Na and $^{26}$Al ions were measured using a multi-reflection time-of-flight (MR-ToF) mass spectrometer, achieving a resolving power of up to $170{,}000$. To verify target handling and operational techniques for future use of UCx target material, a preliminary test using a LaC$_2$ target was conducted, resulting in the production of Cs and Ba isotopes ($A = 130\text{-}138$). In August 2024, a charge-bred $^{25}$Na$^{5+}$ beam was post-accelerated by the SCL3 linac and delivered to the KoBRA spectrometer, where it was separated from the contaminants with the same $A/q$, such as $^{40}$Ar$^{8+}$ and $^{15}$N$^{3+}$. Laser spectroscopy of $^{21,22,23}$Na was also conducted at CLS (Collinear Laser Spectroscopy) to investigate hyperfine structure and isotope shift. In 2025, $^{22,23,27,28}$Mg beams have been produced with the laser ion source, and production of Al beams using off-resonance laser ionization is underway. The plasma ion source, following a successful offline validation using noble gases, is being prepared for online operation with SiC and TiC targets. Rare isotope beam production using actinide targets such as UCx or ThC is planned in late 2026.
| Email address | jinhlee@ibs.re.kr |
|---|---|
| Classification | Isotope production, target, and ion source techniques |
