Author: Sha, P.
Paper Title Page
MOPTS056 Optimization of SC Cavity Type for CSNS Linac Upgrade 987
 
  • Y. Wang, M.X. Fan, A.H. Li, B. Li, P.H. Qu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • J.P. Dai, H.C. Liu, P. Sha
    IHEP, Beijing, People’s Republic of China
  • X.L. Wu
    DNSC, Dongguan, People’s Republic of China
  
  In order to increase CSNS beam power from 100kW to 500kW, the Linac injection energy need to be increased from 80MeV to 300MeV. The combined layout of superconducting spoke cavities and elliptical cavities will be adopted to accelerate H− beam to 300MeV. Two operation frequency of spoke cavities were compared with single and double spoke structure, a compact 648MHz βg=0.4 single spoke cavity was proposed, and the RF performance was presented, as well as the MP behavior.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS056  
About • paper received ※ 09 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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WEPRB031 SRF Trip Caused by the Tuner in BEPCII 2880
 
  • J.P. Dai, Z.H. Mi, P. Sha, Y. Sun, Q.Y. Wang, L.G. Xiao
    IHEP, Beijing, People’s Republic of China
  
  Funding: Work support by Natural Science Foundation of China (11575216)
The stability and reliability of the Superconducting RF system (SRF) is generally a key issue in a large scale accelerator such as Beijing Electron Positron Collider II (BEPCII). In the past several years, SRF is one of the main factors limiting the availability of BEPCII, and many efforts have been made to fix the SCRF troubles. This paper focuses on the details of the SCRF trip caused by the tuner, which is one of the most persistent troubles and figured out till the summer of 2018. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB031  
About • paper received ※ 08 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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WEPRB037 Development of EP System at IHEP 2890
 
  • S. Jin, J.P. Dai, J. Dai, H.F.S. Feisi, J. Gao, D.J. Gong, Z.Q. Li, Z.C. Liu, W.M. Pan, P. Sha, Y. Sun, J.Y. Zhai, P. Zhang
    IHEP, Beijing, People’s Republic of China
  
  Electropolishing (EP) is a necessary technology for high quality cavities including both high accelerating gradient and high quality factor cavities, which will be used for several future large projects such as CEPC, Shanghai hard X-ray FEL, ILC, and so on. An EP system was development at IHEP, CAS. In last years, we finished all the engineering design and fabrication including functional circulation loops design, system parameters choices, key equipment choice or design, components test and fabrication. According to the functions of various components, the whole system were divided into three main units: electrolyte mixing, acid solution and mechanical platform, and several key components such as rotation sleeves, DC power supply and so on. Since the system is designed for both R&D and mass production, several characteristics comparing with those in other labs in the world can be realized, including dozens of solution circulations, electrolyte mixing, new and old acid separation, cavity outside water cooling, cathode vertical assembly, and compatible for several types of cavities. We will report them in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB037  
About • paper received ※ 21 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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