• T.X. Zhao, W.H. Lu, L.-Y. Xiong, L. Zhang, Z.G. Zong
  TIPC, BeiJing
• J. Gao, Y. Sun, J.Y. Zhai
  IHEP Beijing, Beijing
• Z.L. Hou, C.H. Li
  IHEP Beiing, Beijing
• L.Q. Liu
  Technical Institute of Physics and Chemistry, Beijing
• T.X. Zhao
  Graduate School of the Chinese Academy of Sciences, Beijing

Funding: Work supported by NSFC 10525525

In order to obtain the design, manufacture and operational experiences on the SRF cryomodule toward ILC, a test cryomodule for 1.3GHz single 9-cell SC cavity was designed by IHEP (Institute of High Energy Physics) and TIPC (Technical Institute of Physics and Chemistry) jointly. This cryomodule will be used as a 1.3GHz 9 cell SC cavity horizontal test facility. The cryogenic system for the cryomodule is designed and will be operated at 2.0K, with the saturated superfluid helium. The major requirements, design, simulation results of the cryomodule are reported in the paper. This key component of a superconducting accelerator test unit will be built in the near future at IHEP.

• J. Gao, Q.J. Xu, J.Y. Zhai, Z.G. Zong
  IHEP Beijing, Beijing
• F. Furuta, K. Saito
  KEK, Ibaraki
• L.Q. Liu, L. Zhang
  TIPC, BeiJing

Funding: Supported by National Natural Science Foundation of China (10525525)

1.3 GHz single cell large grain (LG) cavities have been studied in our research programs on the superconducting cavity for the International Linear Collider (ILC) in the last three years and five LG cavities were fabricated at IHEP and KEK. Three cavities were dealt with by surface treatments based on electro polishing (EP) and the maximum gradient of 47.90 MV/m was achieved. The other two cavities were treated based on chemical polishing (CP) and both reached the accelerating gradients higher than 35 MV/m with the maximum gradient of 40.27 MV/m. In this paper, the performance comparison of the large grain cavities will be presented and discussed.

Slides

• J. Gao, S.Y. Chen, Y.L. Chi, J.P. Dai, J. Gu, M. Hou, K.X. Huang, T.M. Huang, S.P. Li, Z.Q. Li, Q. Ma, W.M. Pan, Y. Sun, G.W. Wang, Z.X. Xu, J. Yu, J.Y. Zhai
  IHEP Beijing, Beijing
• L.Q. Liu, W.H. Lu, T.X. Zhao
  TIPC, BeiJing

Funding: NSFC 10525525

With the aim to develop 1.3 GHz superconducting radio-frequency (SCRF） technology in the frame of ILC collaboration, IHEP has started a program to build a SCRF Accelerating Unit. This unit contains a 9-cell 1.3 GHz superconducting cavity, a short cryomodule, a high power input coupler, a tuner, a low level RF system and a high power RF source, etc. This program also includes the SCRF laboratory upgrade, which will permit the unit to be built and tested at IHEP. We will use this unit as a horizontal test stand for many 9-cell cavities and other components (e.g. input couplers, tuners), as in Europe and North America. In this paper, we report the recent R&D status and the future plan of this program.