Speaker
Description
Since the China Spallation Neutron Source (CSNS) was completed and put into official operation in 2018, its operational performance has been continuously improved. Up to now, the beam power has reached 185 kW, which is 85% higher than the design value, with a stable annual beam supply time of more than 5000 hours and good overall operational reliability. As the core support system for beam transmission and operation, the CSNS vacuum system is mainly composed of the Linear Accelerator (LINAC), Rapid Cycling Synchrotron (RCS), Low Energy Beam Transfer Line (LRBT) and High Energy Beam Transfer Line (RTBT) vacuum systems. Meanwhile, supporting application beamline vacuum systems such as APEP and Back-n have been developed, with the operating vacuum pressure of each subsystem ranging from 10⁻³ Pa to 10⁻⁷ Pa. After nearly ten years of trial operation and official operation assessment, the vacuum system has been running stably as a whole, but various vacuum-related faults have still occurred during the period. Based on practical operation experience, this paper systematically sorts out typical vacuum fault cases, analyzes the fault generation mechanism and puts forward targeted coping strategies, providing a reference for the stable operation of similar vacuum systems. In addition, the CSNS-II project was officially launched in 2024, with a planned construction period of 5 years to complete the overall construction task. Its vacuum system has been upgraded and optimized in many aspects on the basis of the original system to adapt to higher operational requirements. This paper also introduces the recent research and development progress of the CSNS-II vacuum system, clarifies the core tasks at the current stage, and looks forward to the subsequent research and development plans and optimization directions, providing technical sorting and support for the smooth progress of the project construction.
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