Author: Liu, Z.C.
Paper Title Page
WEPMB028 High HOM Damping Structure Study for CEPC 2183
 
  • Z.C. Liu, J. Gao, S. Jin, Y. Wang, H.J. Zheng
    IHEP, Beijing, People's Republic of China
  
  Both large circular collider such as CEPC and high current ERL facility need high HOM damping superconducting cavity. The slotted cavity is an option for such applications. It has three slotted waveguides which can highly damp the HOM and extract high HOM power out. However, the HOM absorbers for such facility are usually put outside of the cryomodule to decrease the influence of HOM power on the cryogenic system. Large slot waveguide need to make smaller transition structure to adapt this situation. A rectangular waveguide to coaxial waveguide structure was designed to the slotted cavity. In this paper, we will show the cavity HOM damping design scheme with this structure.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB028  
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WEPMB031 Post Processing of Spoke Type Superconducting Cavities at Institute of High Energy Physics 2191
 
  • J. Dai, J.P. Dai, F.S. He, X. Huang, L.H. Li, Z.Q. Li, H.Y. Lin, Z.C. Liu, B. Ni, W.M. Pan, P. Sha, G.W. Wang, Q.Y. Wang, Z. Xue, X.Y. Zhang, G.Y. Zhao
    IHEP, Beijing, People's Republic of China
  
  Funding: Work supported by Chinese Academy of Science strategic Priority Research Program-Future Advanced Nuclear Fission Energy.
After upgrading the post-processing system, several superconducting cavities were RF tested at Institute of High Energy Physics (IHEP) in China recently. The test results of 14 spoke 012 cavities and 6 spoke 021 cavities which used at China ADS injector I and linac all exceeds our design objective. Moreover, a spoke 040, a 650MHz elliptical cavity and a 325MHz HWR cavity are also vertical tested and the test results are all significantly surpass our design value. The post processing of these cavities including Buffered Chemical Polishing (BCP), high temperature heat treatment and High Pressure water Rinsing (HPR) is presented here.
daijin@pku.edu.cn 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB031  
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WEPMB032 Fabrication and Testing Status of IHEP03 2194
 
  • T.X. Zhao, J. Gao, S. Jin, Z.Q. Li, Y.L. Liu, Z.C. Liu, Y. Wang, J.Y. Zhai, H.J. Zheng
    IHEP, Beijing, People's Republic of China
  • M. Asano, E. Kako
    KEK, Ibaraki, Japan
  • H. Yu, H. Yuan
    BIAM, Beijing, People's Republic of China
  
  After the successful development of the IHEP01 and IHEP02 1.3GHz 9cell superconducting cavity, we developed a 1.3GHz Tesla-Like 9cell superconducting cavities in collaboration with KEK. The cavity was made by niobium material produced in OTIC, Ningxia, China. After completeing welding, leakage check, BCP, HPR, we sent the cavity to KEK and used the standard procedures of ILC cavity for processing. These include electron polishing, vacuum furnace outgassing, tuning for field flatness and frequency, light EP, baking and vertical test. We target to have a high Q0 cavity for this experiment. In this paper, we will report the experimental status of the IHEP03 cavity.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB032  
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