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Objective <p>The Beijing Electron–Positron Collider (BEPC) is a circular collider operating in the τ-charm energy region, which has been in operation since 1988 and underwent a major upgrade (BEPCII) that enhanced its beam energy to 1.89&#xa0;GeV. To meet the further requirements of high-energy physics research in the τ-charm energy region, the linear injector is required to stably deliver an electron–positron beam with an energy range of 2.35&#xa0;GeV–2.8&#xa0;GeV.</p> Methodology <p>To address the beam energy requirement, two additional radio frequency (RF) power source systems developed based on the solid-state modulator scheme were integrated into the linear accelerator. For the purpose of meeting reliability specifications, the modulators based on the pulse forming network (PFN) were subjected to systematic upgrading and modification, which specifically involved enhancing repetition stability, conducting in-depth research on service life and reliability, and establishing and implementing fault prediction protocols.</p> Results <p>Following the system upgrade, the linear RF power source system has maintained long-term stable operation, which fully complies with the latest energy and stability requirements of the linear accelerator. Furthermore, the localized replacement of key core equipment and components has been successfully achieved, thereby providing crucial technical support for the enhancement of BEPCII’s collision energy and the advancement of subsequent physics research projects.</p>

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Upgrading the BEPCII Linac radio frequency power system

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Fei Li,
  • Zusheng Zhou,
  • Jindong Liu,
  • Jingyi Li,
  • Xiaoping Li,
  • Wenzhi Liu,
  • Cai Meng,
  • Yajie Mu,
  • Lei Qian,
  • Xiuqian Shi,
  • Dayong He

摘要

Objective

The Beijing Electron–Positron Collider (BEPC) is a circular collider operating in the τ-charm energy region, which has been in operation since 1988 and underwent a major upgrade (BEPCII) that enhanced its beam energy to 1.89 GeV. To meet the further requirements of high-energy physics research in the τ-charm energy region, the linear injector is required to stably deliver an electron–positron beam with an energy range of 2.35 GeV–2.8 GeV.

Methodology

To address the beam energy requirement, two additional radio frequency (RF) power source systems developed based on the solid-state modulator scheme were integrated into the linear accelerator. For the purpose of meeting reliability specifications, the modulators based on the pulse forming network (PFN) were subjected to systematic upgrading and modification, which specifically involved enhancing repetition stability, conducting in-depth research on service life and reliability, and establishing and implementing fault prediction protocols.

Results

Following the system upgrade, the linear RF power source system has maintained long-term stable operation, which fully complies with the latest energy and stability requirements of the linear accelerator. Furthermore, the localized replacement of key core equipment and components has been successfully achieved, thereby providing crucial technical support for the enhancement of BEPCII’s collision energy and the advancement of subsequent physics research projects.