Author: Wu, X.W.
Paper Title Page
WEPWB044 Realization of Accelerating Gradient Larger than 25 MV/m on High-Q 1.3 GHz 9-Cell Cavities for SHINE 658
SUSPB039   use link to see paper's listing under its alternate paper code  
 
  • Y. Zong, Q.X. Chen, X. Huang, Z. Wang
    SINAP, Shanghai, People’s Republic of China
  • J.F. Chen, P.C. Dong, H.T. Hou, X.Y. Pu, J. Shi, S. Sun, D. Wang, J.N. Wu, S. Xing, S.J. Zhao, Y.L. Zhao
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • Y.W. Huang
    ShanghaiTech University, Shanghai, People’s Republic of China
  • X.W. Wu
    Zhangjiang Lab, Shanghai, People’s Republic of China
 
  Funding: This work was supported by Shanghai Municipal Science and Technology Major Project (No. 2017SHZDZX02).
We pre­sent our stud­ies on the op­ti­mized ni­tro­gen-dop­ing and medium-tem­per­a­ture bak­ing recipes ap­plied on 1.3GHz SRF cav­i­ties, aim­ing at meet­ing the re­quire­ments of the SHINE pro­ject. The op­ti­mized ni­tro­gen-dop­ing process re­sulted in achiev­ing a Q₀ of over 4.0×1010 at medium field and a max­i­mum ac­cel­er­at­ing gra­di­ent ex­ceed­ing 35 MV/m on sin­gle cell cav­i­ties, and a Q₀ of over 2.8×1010 at medium field and a max­i­mum ac­cel­er­at­ing gra­di­ent ex­ceed­ing 26 MV/m in 9-cell cav­i­ties. For 1.3 GHz 9-cell cav­i­ties sub­jected to medium-tem­per­a­ture bak­ing, Q₀ val­ues ex­ceed­ing 3.5×1010 at 16 MV/m and max­i­mum ac­cel­er­at­ing gra­di­ents sur­pass­ing 25 MV/m were achieved. These stud­ies pro­vide two op­tions of high-Q recipes for SHINE cav­i­ties. The treat­ment processes of cav­i­ties and their ver­ti­cal test re­sults are de­scribed in this paper.
*chenjinfang@sari.ac.cn
 
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB044  
About • Received ※ 19 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 26 June 2023
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THIAA01 Development of 3.9 GHz 9-Cell Cavities at SHINE 921
 
  • X.W. Wu
    Zhangjiang Lab, Shanghai, People’s Republic of China
  • J.F. Chen, P.C. Dong, Y.F. Liu, X.H. Ouyang, S. Sun, J.N. Wu, S. Xing, Y.X. Zhang, S.J. Zhao, Y.L. Zhao
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • X. Huang, Z. Wang, Y. Zong
    SINAP, Shanghai, People’s Republic of China
  • Y.W. Huang, R.Z. Xia
    ShanghaiTech University, Shanghai, People’s Republic of China
 
  The Shang­hai high-rep­e­ti­tion-rate XFEL and ex­treme light fa­cil­ity (SHINE) Linac re­quires two 3.9~GHz cry­mod­ules to lin­earize en­ergy dis­tri­b­u­tion be­fore the bunch com­pres­sor. As a key com­po­nent to the pro­ject, stud­ies of 3.9~GHz cav­i­ties were con­ducted in the past few years. The first 3.9~GHz 9-cell pro­to­type cav­ity has been fab­ri­cated, tested, and qual­i­fied. It reached Q0=3.5×109 at 13.1~MV/m and a max­i­mum ac­cel­er­at­ing gra­di­ent of 25.0~MV/m dur­ing the ver­ti­cal test of the bare cav­ity. The pro­to­type has been he­lium tank in­te­grated and reached Q0=2.9×109 at 13.1~MV/m in the ver­ti­cal test, with a large mar­gin with re­spect to the SHINE spec­i­fi­ca­tion. The sec­ond pro­to­type has been fab­ri­cated and is planned to be tested in 2023. This paper will cover the fab­ri­ca­tion, sur­face treat­ment, and RF test of the 3.9~GHz cav­i­ties.  
slides icon Slides THIAA01 [7.573 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-THIAA01  
About • Received ※ 19 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 18 July 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)