Recently, the first high-power high-gradient magnetic alloy loading cavity in China was officially put into operation in , the space charge effect was reduced by longitudinal manipulation by increasing the beam convergence factor, and played an important role in the optimization of the main parameters of the beam convergence, verifying the key technical route for the second phase of beam convergence power increase in China's spall neutron source.
high power high gradient magnetic alloy loading cavity is a key technology that must be broken through in China's spalling neutron source phase II (CSNS-II), which has been blocked abroad for a long time. After nearly ten years of pre-research on , the team started from basic materials and basic processes and achieved significant results in the development of domestic high-power high-gradient magnetic alloy loading chambers. Among them, the most critical technical indicator of the magnetic ring reached 13GHz@3MHz, which is about 30% higher than the highest performance indicator currently reported in the international community. In September 2021, the high-power test of the magnetic alloy loading cavity was completed, with the acceleration gradient reaching 40.76kV/m, which is at the international advanced level. On this basis, a stability test of more than 3,000 hours was carried out to verify the reliability of the long-term operation of the magnetic alloy loading cavity, and the equipment installation and formal operation were completed during the summer maintenance of China Spallation Neutron Source in August 2022.
In the development process of high-power high-gradient magnetic alloy loading cavity, all basic materials including iron-based nanocrystalline alloy have been domestically produced. Magnetic ring preparation, cavity design and related technologies have completely independent intellectual property rights, and key core technologies are independent and controllable. In particular, the high insulation and low stress SiO2 coating technology was successfully developed, achieving uniform coating with a 2um thickness of 250V pressure resistance. Related research results have broad application prospects in high-power strong current proton/heavy ion accelerators, FFAG accelerators, pulse-induced accelerators and particle therapy accelerators.
project has received funding from key cultivation project of Chinese Academy of Sciences, Youth Innovation Promotion Association of Chinese Academy of Sciences and National Natural Science Foundation of China (11175194, 11875270, U1832210) projects. Institute of Chemistry, Chinese Academy of Sciences , Institute of Silicate, China Institute of Steel, Antai Technology Co., Ltd. , Zhejiang Jingxin Magnetics Co., Ltd., Hefei Keye Electrical Physical Equipment Manufacturing Co., Ltd. , Beijing Aerospace Guangtong Technology Co., Ltd. and other related units participated in the research and development of key technologies of this project.
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