Speaker
Description
Since the China Spallation Neutron Source (CSNS) was officially commissioned in 2018, its operational performance has been continuously improved. To date, the beam power has reached 185 kW, which is 85% higher than the design value, with a stable annual beam delivery time of more than 5000 hours and good overall operational reliability. The vacuum system serves as the core support for stable beam transport, mainly consisting of the Linear Accelerator (LINAC), Rapid Cycling Synchrotron (RCS), Low?Energy Beam Transfer Line (LRBT), and High?Energy Beam Transfer Line (RTBT). In addition, supporting vacuum systems for application beamlines such as APEP and Back?n have been developed, with operating vacuum pressures ranging from 10⁻³ Pa to 10⁻⁷ Pa.The first?phase vacuum system is equipped with 294 ion pumps, 64 cold cathode gauges, 12 turbo molecular pumps, and more than 600 vacuum pipelines. After nearly ten years of operation, the vacuum system has remained stable overall; however, typical faults such as DTL leakage, bellows corrosion, vacuum gauge fluctuation, and vacuum chain fracture have occurred. Based on practical operational experience, this paper systematically summarizes fault characteristics, analyzes fault mechanisms, and proposes corresponding countermeasures, providing a reference for the stable operation of vacuum systems in similar accelerators.The CSNS?II project was officially launched in 2024 to meet the 500 kW high?power requirement, with a five?year construction plan focusing on superconducting cavities, high?energy proton beamlines, and a muon beamline. The vacuum system has been comprehensively upgraded based on the first?phase configuration. Meanwhile, this paper presents the latest development progress of the CSNS?II vacuum system.
| Paper status | Proceeding files received |
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