China Accelerator Facility for Superheavy Elements (CAFE2) is a state-of-the-art scientific facility dedicated to the synthesis and investigation of superheavy nuclei and elements. It features a continuous wave RFQ, a fully superconducting linac that comprises twenty three half-wave resonator cavities housed within four cryostats, and an experimental terminal. The linac is designed to achieve an energy of 6.5 MeV/u for ion species with an A/Q ratio approximately equal to 3.5. CAFE2 evolved from its predecessor, CAFe, which was initially a proton demo linac for accelerator driven systems. Following its upgrade in 2021, CAFE2 has accumulated over 10000 hours of operation time, providing heavy ion beams for superheavy element experiments at beam currents exceeding 10 upA. This talk will review the operation of CAFE2 and highlight the efforts to enhance the stability and tuning efficiency of high-intensity heavy ion beams.

The low-energy, high-intensity, high-charge-state heavy ion accelerator facility LEAF (Low Energy Accelerator Facility) has recently been fully completed at IMP. LEAF aims to prototype the room temperature front end of the High Intensity Heavy Ion Accelerator Facility (HIAF), and to operate as a standalone facility to conduct research in multiple physics disciplines using high-intensity, low-energy heavy ion beams. Capable of accelerating high-intensity ion beams of M/q=2~7 to 0.3~0.7 MeV/u, LEAF comprises a high-performance highly charged superconducting ECR ion source, a high-voltage platform, a low-energy beam transport (LEBT), a 4-vane 81.25 MHz RFQ, a medium-energy beam transport (MEBT), a 81.25 MHz IH structure DTL and several experimental terminals. First constructed in 2018, the facility had logged 13,000 hours of on-target beam time by March 2024. Recently, with the high-performance ECR ion source in operation, >1.0 emA O6+ and >0.2 emA Bi35+ have been successfully accelerated with an efficiency of 80%~85%. This talk will describe the design LEAF and its features as a multidisciplinary heavy ion platform, and discuss the commissioning of high-intensity heavy ion beams.

Cocktail beams, composed of multiple ion species with tailored energy and composition, have emerged as a transformative tool for simulating the synergistic irradiation effects experienced by structural materials in advanced nuclear reactors. This study demonstrates the development of cocktail ion beams at the Low Energy high-intensity heavy ion Accelerator Facility (LEAF), leveraging a fourth-generation superconducting ECR ion source (FECR) and energy modulation systems to generate high-intensity, low-energy-spread beams. Key innovations include a drift tube linac (DTL) and rebunchers, enabling precise energy tuning to align ion penetration depths. To validate the radiation-induced damage characteristics of mixed-ion beams, irradiation responses of monocrystalline copper were systematically compared across different irradiation modalities. The analysis reveals that simultaneous cocktail beam exposure induces markedly distinct microstructural evolution compared to sequential irradiation (e.g., Fe→He or He→Fe) and single-ion (e.g., Fe or He) irradiation protocols under equivalent displacement damage conditions.