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Background <p>This paper focuses on the design scheme of the copper accelerating cavity for the CEPC damping ring. According to the physical design requirements, the accelerating cavity must provide an accelerating voltage of 2.5&#xa0;MV. By employing two 650&#xa0;MHz RF cavities operating in continuous wave (CW) mode in series, the accelerating voltage is shared equally between the two cavities, thereby enhancing operational reliability.</p> Methods <p>The beam instability analysis shows that when the beam aperture of the RF cavity is greater than 90&#xa0;mm, the HOM in the cavity has no effect on the beam. For this reason, a 5-cell cavity at room temperature is designed. In addition to the cavity, the coupler and doorknob are also designed, and the vacuum of the cavity is calculated. By reasonably arranging the vacuum pump, the vacuum requirements can be met.</p> Results <p>Based on calculations, each RF cavity is designed to operate at 60&#xa0;kW, including a 20% safety margin. Accounting for waveguide attenuation and transmission losses, a solid-state RF power source with a minimum output of 90&#xa0;kW per cavity is required.</p> Conclusion <p>The design fully meets the requirements of the CEPC damping ring, providing a solid foundation for subsequent processing and manufacturing.</p>

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The design of the copper cavity for the CEPC linac damping ring

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Jingru Zhang,
  • Hua Shi,
  • Ouzheng Xiao,
  • Yudong Liu,
  • Baiqi Liu,
  • Cai Meng,
  • Dou Wang,
  • Xiang He,
  • Siyu Chen,
  • Faizan Elahi

摘要

Background

This paper focuses on the design scheme of the copper accelerating cavity for the CEPC damping ring. According to the physical design requirements, the accelerating cavity must provide an accelerating voltage of 2.5 MV. By employing two 650 MHz RF cavities operating in continuous wave (CW) mode in series, the accelerating voltage is shared equally between the two cavities, thereby enhancing operational reliability.

Methods

The beam instability analysis shows that when the beam aperture of the RF cavity is greater than 90 mm, the HOM in the cavity has no effect on the beam. For this reason, a 5-cell cavity at room temperature is designed. In addition to the cavity, the coupler and doorknob are also designed, and the vacuum of the cavity is calculated. By reasonably arranging the vacuum pump, the vacuum requirements can be met.

Results

Based on calculations, each RF cavity is designed to operate at 60 kW, including a 20% safety margin. Accounting for waveguide attenuation and transmission losses, a solid-state RF power source with a minimum output of 90 kW per cavity is required.

Conclusion

The design fully meets the requirements of the CEPC damping ring, providing a solid foundation for subsequent processing and manufacturing.