• 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, Y. Sun, G.W. Wang, Z.X. Xu, J. Yu, J.Y. Zhai, J.R. Zhang
  IHEP Beijing, Beijing
• R. Ge, C.H. Li
  IHEP Beiing, Beijing

IHEP has started the “1.3 GHz SCRF Accelerating Unit and Horizontal Test Stand Project” since early 2009. The SCRF Accelerating 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 unit will also serve as a Horizontal Test Stand (HTS) for new components R&D. Recent progress of the components R&D is presented, as well as the key SCRF facilities design and commissioning, i.e. the CBP machine, pre-tuning machine and BCP facility for 9-cell cavities.

Poster

• J.Y. Zhai, Y.L. Chi, J.P. Dai, J. Gao, J. Gu, M. Hou, Z.Q. Li, J. Yu, J.R. Zhang
  IHEP Beijing, Beijing
• J.Z. Chen, J.Q. Qiao
  HJL, Beijing
• J.X. Wang, H. Yu, H. Yuan
  BIAM, Beijing
• W.P. Xie
  OTIC, Ningxia
• T.X. Zhao
  TIPC, BeiJing

As the key component of the “IHEP 1.3 GHz SCRF Accelerating Unit and Horizontal Test Stand Project”, a low-loss shape bare tube 9-cell cavity using Ningxia large grain niobium is being fabricated at IHEP. This paper presents the fabrication procedure and frequency tuning method of the dumbbells of this cavity. Due to the special properties of the large grain material, several mechanical and RF problems were found and successfully solved. After equator welding, this cavity will be surface treated and tested late this year.

Poster