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<p>We report the world-leading performance of a 1.3 GHz cryomodule equipped with eight 9-cell superconducting radio-frequency cavities that underwent a medium-temperature furnace baking process. During continuous wave horizontal testing, these cavities achieved unprecedented average intrinsic quality factors of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1630_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="71" /> </InlineMediaObject> <EquationSource Format="TEX">\({4.0 \times 10^{10}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>4.0</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>10</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> at 20 MV/m and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1630_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="71" /> </InlineMediaObject> <EquationSource Format="TEX">\({3.2 \times 10^{10}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>3.2</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>10</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> at 29 MV/m, with no instances of field emission. The cryomodule demonstrates near-complete preservation of ultra-high&#xa0;quality factors and ultra-high accelerating gradients from vertical to horizontal testing, marking a significant milestone in continuous-wave superconducting radio-frequency accelerator technology. This letter presents the cryomodule development experience, including cavity preparation, cryomodule assembly, degaussing, fast cooldown, and performance testing.</p>

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Ultra-high quality factor and ultra-high accelerating gradient achievements in a 1.3 GHz continuous wave cryomodule

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Jin-Fang Chen,
  • Yue Zong,
  • Xiao-Yun Pu,
  • Sheng-Wang Xiang,
  • Shuai Xing,
  • Zheng Li,
  • Xu-Ming Liu,
  • Yan-Fei Zhai,
  • Xiao-Wei Wu,
  • Yong-Zhou He,
  • Ling-Ling Gong,
  • Ji-Dong Zhang,
  • Shan-Shan Cao,
  • Wen-Ding Fang,
  • Bin-Tuan Zhang,
  • Kai Xu,
  • Yi-Bo Yu,
  • Guang-Hua Chen,
  • Li-Jun Lu,
  • Ya-Wei Huang,
  • Shen-Jie Zhao,
  • Hong-Tao Hou,
  • Zhen-Yu Ma,
  • Ye-Liang Zhao,
  • Xiang Zheng,
  • Jiu-Ce Sun,
  • Sen Sun,
  • Zhi-Qiang Jiang,
  • Yu-Bin Zhao,
  • Meng Zhang,
  • Ying-Bing Yan,
  • Yi-Yong Liu,
  • Qiang Gu,
  • Bo Liu,
  • Li-Xin Yin,
  • Dong Wang,
  • Hai-Xiao Deng,
  • Zhen-Tang Zhao

摘要

We report the world-leading performance of a 1.3 GHz cryomodule equipped with eight 9-cell superconducting radio-frequency cavities that underwent a medium-temperature furnace baking process. During continuous wave horizontal testing, these cavities achieved unprecedented average intrinsic quality factors of \({4.0 \times 10^{10}}\) 4.0 × 10 10 at 20 MV/m and \({3.2 \times 10^{10}}\) 3.2 × 10 10 at 29 MV/m, with no instances of field emission. The cryomodule demonstrates near-complete preservation of ultra-high quality factors and ultra-high accelerating gradients from vertical to horizontal testing, marking a significant milestone in continuous-wave superconducting radio-frequency accelerator technology. This letter presents the cryomodule development experience, including cavity preparation, cryomodule assembly, degaussing, fast cooldown, and performance testing.