Author: Li, Z.Q.
Paper Title Page
MOFAB4
Overview and SRF Requirements of the CiADS Project  
 
  • Y. He, Q. Chen, Z. Gao, H. Guo, G. Huang, Y.L. Huang, T.C. Jiang, C.L. Li, S.H. Liu, T. Tan, Y.Q. Wan, F.F. Wang, J.Q. Wu, W.M. Yue, B. Zhang, J.H. Zhang, S.H. Zhang, S.X. Zhang
    IMP/CAS, Lanzhou, People’s Republic of China
  • J.P. Dai, F.S. He, Z.Q. Li, W.M. Pan
    IHEP, Beijing, People’s Republic of China
  • T.C. Jiang
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
 
  Chinese initiative Accelerator Driven System started constructing in 2018. It consists a superconducting linac with 500 MeV and 5 mA; an LEB coolant fast reactor with 7.5 MW. The first beam coupling with reactor will be in 2024. The sc linac employed 5 families of superconducting resonators, two types of HWRs (β=0.1 and β=0.19), one type of double spokes (β=0.42) and two types of ellipticals (β=0.62 and β=0.82). The whole system will operate in 2 K. A space has been reserved for future upgrading to 1 GeV. As a demo of front-end of ADS, the CAFe (China ADS Front-end demo linac) has been developed and commissioned to verify the SRF techniques, high power CW beam and RAMI. 45 kW proton beam has been delivered to the dump and lasted more than 100 hours at the beginning of 2019. According to the operation experience, the challenge is the stability and performance of cavities under the heavy beam loading, some phenomenas have been observed. Up to now, the design of bulk Nb cavities have been finished and the prototype fabrication is on going. The techniques of Nb/Cu cavity and Nb3Sn are also developed in IMP for the future project of ADS.  
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TUP010 Mechanical Design and Horizontal Tests of a Dressed 166.6 MHz Quarter-wave β=1 SRF Cavity System 408
 
  • X.Y. Zhang, X.R. Hao, D.B. Li, Z.Q. Li, H.Y. Lin, Q. Ma, Z.H. Mi, Q.Y. Wang, P. Zhang
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work has been supported by HEPS-TF project.
A 166.6 MHz quarter-wave β=1 superconducting proof-of-principle cavity has been designed and recently been dressed with a helium jacket, fundamental power coupler and tuner. The cavity was subsequently installed in a modified cryomodule and tested in a horizontal manner at both 4.2 K and 2 K. The helium jacket was successfully developed with a focus on minimizing frequency shift due to helium pressure fluctuation while retaining a reasonable tuning range. The Lorentz force detuning (LFD) and microphonics were also optimized during the design. The df/dp and LFD coefficient were measured to be -3.1 Hz/mbar and -0.8 Hz/(MV/m)2. These are in good agreement with simulations. Future work is mainly to reduce the stiffness of the cavity and further suppress the vibration mode of the inner conductor.
 
poster icon Poster TUP010 [1.245 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP010  
About • paper received ※ 23 June 2019       paper accepted ※ 29 June 2019       issue date ※ 14 August 2019  
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TUP068 Study of Surface Treatment of 1.3 GHz Single-cell Copper Cavity for Niobium Sputtering 605
SUSP018   use link to see paper's listing under its alternate paper code  
 
  • F.Y. Yang, J. Dai, P. He, Z.Q. Li, Y. Ma, P. Zhang
    IHEP, Beijing, People’s Republic of China
 
  Funding: This work has been supported in part by PAPS project and National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400)
A R&D program on niobium sputtering on copper cavities has started at IHEP in 2017. Single-cell 1.3 GHz copper cavity has been chosen as a substrate. A chemical polishing system has subsequently developed and commissioned recently to accommodate the etching of both copper samples and a cavity. Different polishing agents have been tested on copper samples and later characterized. The results of these surface treatment tests are presented.
 
poster icon Poster TUP068 [1.228 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP068  
About • paper received ※ 20 June 2019       paper accepted ※ 03 July 2019       issue date ※ 14 August 2019  
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TUP072 The Development of Niobium Sputtering on Copper Cavities at IHEP 613
 
  • J. Dai, P. He, Z.Q. Li, Y. Ma, F.Y. Yang, P. Zhang
    IHEP, Beijing, People’s Republic of China
 
  A R&D program focusing on niobium sputtering on copper cavities started at IHEP in 2017. Single-cell 1.3 GHz elliptical cavity shape has been initially chosen as sputtering substrate. A magnetron sputtering system have been developed in 2018. In addition, a surface treatment facility to polish the copper substrate before sputtering has been developed and commissioned. This paper will present the Nb/Cu coating activities at IHEP.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP072  
About • paper received ※ 19 June 2019       paper accepted ※ 04 July 2019       issue date ※ 14 August 2019  
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TUP080 Tuner Design and Test for 166.6 MHz SRF Cavity of HEPS 642
 
  • Z.H. Mi, Z.Q. Li, H.Y. Lin, W.M. Pan, Q.Y. Wang, P. Zhang, X.Y. Zhang, H.J. Zheng
    IHEP, Beijing, People’s Republic of China
 
  The 166.6 MHz superconducting RF cavities have been proposed for the High Energy Photon Source (HEPS), a 6 GeV kilometer-scale light source. The cavity is of quarter-wave type made of bulk niobium with ’=1. Each cavity will be operated at 4.2 K providing 1.2 MV accelerating. To compensate the frequency change due to manufacturing uncertainty, Lorentz force, beam loading, He pressure and microphonics the plunger tuner and gap tuner are chosen as options. Now the plunger tuner and low temperature gap tuner have been test with cavity, while the warm gap tuner is being designed. Details of the design and summary of the test results of the two type tuners with cavity are presented in this paper.  
poster icon Poster TUP080 [1.141 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP080  
About • paper received ※ 22 June 2019       paper accepted ※ 30 June 2019       issue date ※ 14 August 2019  
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FRCAA5
SRF Activities and Progress at IHEP  
 
  • F.S. He, F. Bing, J. Dai, C. Dong, T.M. Huang, S. Jin, D.B. Li, Z.Q. Li, H.Y. Lin, B.Q. Liu, Z.C. Liu, Q. Ma, F. Meng, Z.H. Mi, W.M. Pan, P. Sha, Q.Y. Wang, L.G. Xiao, F.Y. Yang, J.Y. Zhai, P. Zhang, X.Y. Zhang, H.J. Zheng, Q. Zhou
    IHEP, Beijing, People’s Republic of China
 
  There are several active SRF projects at IHEP, including HEPS, CEPC, CSNS upgrade, SHINE and PAPS SRF facility. Four cryomodules with 166.6 MHz β=1 QWR cavities are proposed for HEPS, while each cavity will providing 1.2 MV and 145 kW to the electron beam. The vertical and horizotal tests of the proof-of-principle cavities were recently conducted. 650 MHz 2-cell cavities and 1.3 GHz 9-cell cavities were proposed for the CEPC, and high Q technology is adopted by the project. Infrastructures are developed for the high Q study, while R&D on single-cell cavities are under-way. Efforts on learning mass-production of cavities and cavity-string were also made for both CEPC and SHINE projects. SRF linac from 80 MeV to over 300 MeV were adopted for the upgrade of CSNS, with 325 MHz Double-spoke cavities at β=0.50 and 650 MHz-5cell elliptical cavities at β=0.65. The PAPS SRF facility is biased on mass production for large SRF projects, i.e. aiming at assembly and testing of 200-400 cavities & couplers and 20 cryomodules per year. The equipment installation and commissioning is on going. The activities and progress of these SRF projects with be addressed in this presentation.  
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