Orateur
Description
The ultimate goal of RAON (Rare Isotope Accelerator Complex for Online Experiments) is to combine the Isotope Separator On-Line (ISOL) and In-Flight Separator (IF) systems to produce more exotic rare isotope (RI) beams and access unexplored regions of the nuclear landscape. As the first step, we completed the installation of the ISOL facility in June 2021. The RAON ISOL facility consists of a driver accelerator, a target/ion source (TIS) capable of full remote handling, a pre-mass separator, a Radio Frequency Quadrupole Cooler Buncher (RFQ-CB), an Electron Beam Ion Source Charge Breeder (EBIS-CB) and an A/q separator. The driver accelerator utilizes an H- Cyclotron with an energy of 70 MeV. The primary proton beam of up to 0.75 mA is delivered to the ISOL target/ion source (TIS) module, producing relatively pure and low-energy rare isotopes. The existing TIS module can accommodate up to 10 kW beam power, and it is expected that neutron-rich isotope ions will be produced by uranium fission reaction processes with the rates of 10$^{13}$ fission/s from the maximum beam power. The development of a high-power target and module system that can be operated reliably up to 70 kW proton beam power without compromising the yield of rare isotopes will be a future challenge.
The RI ion beams extracted from the TIS can be transported to the pre-mass separator and cooled in the RFQ-CB. Cooled ion beams can be sent to either a mass measurement system (MMS) or collinear laser spectroscopy (CLS) for the investigation of the fundamental properties of exotic nuclei in the ISOL experimental hall. Alternatively, RI beams can be transported to an A/q separator after charge breeding with the energy of 10 keV/u through RFQ-CB and EBIS-CB and later sent to the RAON injector system for post-accelerator.
The beam commissioning of the 70 MeV proton cyclotron was completed in January 2023, and the first RI beam commissioning using the SiC target for RAON ISOL has started.
