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Purpose <p>Through the upgrade and renovation of the Beijing Electron–Positron Collider II (BEPCII) accelerator and detector systems, we aimed to significantly enhance its collision performance in the high-energy region. Key technological improvements included increasing the beam current and enhancing the accelerating gradient of the RF cavities. The anticipated outcome was to triple the peak luminosity in the high-energy region compared to existing levels, thereby consolidating BEPCII’s competitive advantage in the international high-energy physics research field. Associated upgrades involved the capacity enhancement and renovation of conventional facilities such as the water cooling system, air-conditioning and air-cooling system, compressed air system, and power supply and distribution system. In addition, the installation of core equipment, including magnets, cryogenic valve boxes, RF cavities, and spectrometric detectors, was completed to meet the operational needs of the accelerator and spectrometer.</p> Method <p>During the project’s implementation, we adhered to the principle of resource optimization by systematically assessing the redundancy capacity of existing facilities to prioritize localized renovation solutions. When a comprehensive overhaul was necessary, we maximized the recovery and reuse of existing equipment and pipeline resources. Detailed design and installation adjustments were made based on the new requirements of the accelerator and spectrometer.</p> Results <p>After six months of installation and commissioning, all upgrade and renovation work was successfully completed. The system is currently operating stably, and all performance indicators have reached the expected targets.</p> Conclusion <p>The renovation of conventional facilities and the precise installation of core equipment ensure the long-term stable operation of the system. The effective implementation of resource optimization strategies has not only reduced renovation costs but also provided a reusable technical paradigm for similar accelerator upgrade projects. This upgrade has further strengthened BEPCII’s competitiveness in the field of international high-energy physics, laying a solid foundation for future major scientific discoveries.</p>

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Renovation of the conventional facilities for BEPCⅡ upgrade project

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Yuelei Zhang,
  • Xiaoping Jing,
  • Shuo Tan,
  • Zhixiang Fan,
  • Guoping Lin

摘要

Purpose

Through the upgrade and renovation of the Beijing Electron–Positron Collider II (BEPCII) accelerator and detector systems, we aimed to significantly enhance its collision performance in the high-energy region. Key technological improvements included increasing the beam current and enhancing the accelerating gradient of the RF cavities. The anticipated outcome was to triple the peak luminosity in the high-energy region compared to existing levels, thereby consolidating BEPCII’s competitive advantage in the international high-energy physics research field. Associated upgrades involved the capacity enhancement and renovation of conventional facilities such as the water cooling system, air-conditioning and air-cooling system, compressed air system, and power supply and distribution system. In addition, the installation of core equipment, including magnets, cryogenic valve boxes, RF cavities, and spectrometric detectors, was completed to meet the operational needs of the accelerator and spectrometer.

Method

During the project’s implementation, we adhered to the principle of resource optimization by systematically assessing the redundancy capacity of existing facilities to prioritize localized renovation solutions. When a comprehensive overhaul was necessary, we maximized the recovery and reuse of existing equipment and pipeline resources. Detailed design and installation adjustments were made based on the new requirements of the accelerator and spectrometer.

Results

After six months of installation and commissioning, all upgrade and renovation work was successfully completed. The system is currently operating stably, and all performance indicators have reached the expected targets.

Conclusion

The renovation of conventional facilities and the precise installation of core equipment ensure the long-term stable operation of the system. The effective implementation of resource optimization strategies has not only reduced renovation costs but also provided a reusable technical paradigm for similar accelerator upgrade projects. This upgrade has further strengthened BEPCII’s competitiveness in the field of international high-energy physics, laying a solid foundation for future major scientific discoveries.