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Purpose <p>The BEPCII-Upgrade project has been completed to achieve a higher luminosity and higher energy, which can improve the collision efficiency and extend physics range. Two more superconducting RF (SRF) cavities and two more high-power sources are installed in the storage rings and in Linac, respectively. In order to improve short-term jitter and long-term phase stability of the whole facility, the phase reference line was upgraded not only on the master oscillator (MO) but also on the phase-stabilized signal transmission.</p> Methods <p>The two oscillators of storage rings and Linac are integrated together and driven by one single frequency standard. Four self-developed high-precision optical fiber-based RF signal transmission links are established to distribute RF reference to Linac microwave system (571.2&#xa0;MHz), east SRF system (499.8&#xa0;MHz), west SRF system (499.8&#xa0;MHz) and a new PWFA facility (571.2&#xa0;MHz), which requires 50&#xa0;fs-level synchronization with Linac beam.</p> Results <p>The long-term phase stability between the MO and received RF signals after 150–400&#xa0;m transmission is better than ±&#xa0;0.02 degree peak to peak over 3&#xa0;weeks. The jitters of 2856&#xa0;MHz and 499.8&#xa0;MHz for the Linac and SRF system are 40.7&#xa0;fs and 58.9&#xa0;fs (10&#xa0;Hz–10&#xa0;MHz), respectively.</p> Conclusion <p>The phase reference line system provides monitorable and automatically feedback control of RF phase, which improved the long-term stability of the collider and satisfied the requirements of PWFA experiments.</p>

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Phase reference line system upgrade of BEPCII-Upgrade

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Xinpeng Ma,
  • Guanglei Xu,
  • Dapeng Jin,
  • Ge Lei,
  • Lei Qian,
  • Nan Gan,
  • Cai Meng,
  • Jianshe Cao,
  • Jingyi Li

摘要

Purpose

The BEPCII-Upgrade project has been completed to achieve a higher luminosity and higher energy, which can improve the collision efficiency and extend physics range. Two more superconducting RF (SRF) cavities and two more high-power sources are installed in the storage rings and in Linac, respectively. In order to improve short-term jitter and long-term phase stability of the whole facility, the phase reference line was upgraded not only on the master oscillator (MO) but also on the phase-stabilized signal transmission.

Methods

The two oscillators of storage rings and Linac are integrated together and driven by one single frequency standard. Four self-developed high-precision optical fiber-based RF signal transmission links are established to distribute RF reference to Linac microwave system (571.2 MHz), east SRF system (499.8 MHz), west SRF system (499.8 MHz) and a new PWFA facility (571.2 MHz), which requires 50 fs-level synchronization with Linac beam.

Results

The long-term phase stability between the MO and received RF signals after 150–400 m transmission is better than ± 0.02 degree peak to peak over 3 weeks. The jitters of 2856 MHz and 499.8 MHz for the Linac and SRF system are 40.7 fs and 58.9 fs (10 Hz–10 MHz), respectively.

Conclusion

The phase reference line system provides monitorable and automatically feedback control of RF phase, which improved the long-term stability of the collider and satisfied the requirements of PWFA experiments.