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Background <p>The Beijing Electron–Positron Collider II (BEPCII) has undergone a major upgrade to BEPCII Upgrade project (BEPCII-U), aiming to increase the peak luminosity at the beam energy of 3.5&#xa0;GeV to 1.1 × 10<sup>33</sup>&#xa0;cm<sup>−2</sup>&#xa0;s<sup>−1</sup> from original 3.5 × 10<sup>32</sup>&#xa0;cm<sup>−2</sup>&#xa0;s<sup>−1</sup>. To support this performance enhancement, the RF system has been expanded to four RF cavities from the original two.</p> Purpose <p>To improve the stability of the RF field amplitude and phase&#xa0;in&#xa0;BEPCII-U&#xa0;to ± 0.5% and ± 0.5°, respectively,&#xa0;from the previous specification of ± 1% and ± 1°.</p> Methods <p>Four third-generation Low-level Radio Frequency (LLRF) control systems were developed using Xilinx ZYNQ-7000 series FPGAs, replacing the previous Altera FPGA-based second-generation systems.</p> Results <p>This paper mainly details three critical aspects of the new LLRF system, which are hardware architecture, software innovation, and performance validation during beam operation. The upgraded LLRF control system has been successfully commissioned and is currently operating stably at BEPCII-U. The measured peak-to-peak stabilities of cavity field amplitude and phase were ± 0.1% and ± 0.2° in the positron ring, and ± 0.3% and ± 1.0° in the electron ring. The causes of the degraded stability in the electron ring were analyzed, and future work will focus on testing new methods to improve its performance.</p>

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Low-level RF control system for BEPCII upgrade project

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Qunyao Wang,
  • Jianping Dai,
  • Haiying Lin,
  • Dongbin Li,
  • Pei Zhang

摘要

Background

The Beijing Electron–Positron Collider II (BEPCII) has undergone a major upgrade to BEPCII Upgrade project (BEPCII-U), aiming to increase the peak luminosity at the beam energy of 3.5 GeV to 1.1 × 1033 cm−2 s−1 from original 3.5 × 1032 cm−2 s−1. To support this performance enhancement, the RF system has been expanded to four RF cavities from the original two.

Purpose

To improve the stability of the RF field amplitude and phase in BEPCII-U to ± 0.5% and ± 0.5°, respectively, from the previous specification of ± 1% and ± 1°.

Methods

Four third-generation Low-level Radio Frequency (LLRF) control systems were developed using Xilinx ZYNQ-7000 series FPGAs, replacing the previous Altera FPGA-based second-generation systems.

Results

This paper mainly details three critical aspects of the new LLRF system, which are hardware architecture, software innovation, and performance validation during beam operation. The upgraded LLRF control system has been successfully commissioned and is currently operating stably at BEPCII-U. The measured peak-to-peak stabilities of cavity field amplitude and phase were ± 0.1% and ± 0.2° in the positron ring, and ± 0.3% and ± 1.0° in the electron ring. The causes of the degraded stability in the electron ring were analyzed, and future work will focus on testing new methods to improve its performance.