First Test Result of the IHEP-01 Large Grain 9-Cell Cavity

SUMMARY IHEP has made a low loss shape large grain niobium 9-cell superconducting RF cavity . The cavity was fabricated, welded and successfully processed (CBP + CP) with the SRF facilities developed in IHEP. The gradient was limited by hard quench in the vertical test at KEK STF. We will grind the defects and make further surface treatment and test agai n in the near future. REFERENCES [1] Z. G. Zong, J. Gao, Q. J. Xu, J. Y. Zhai, M. Q. Ge, K. Saito, F. Furuta, T. Saeki, H. Inoue, “Electro-Polished Cavities Using China Ningxia Large Grain Niobium Material”, PAC’07,Albuquerque, June 2007, WEPMN047, p.2143 (2007) [2] Z. G. Zong , J. Gao, H. Sun, F. C. Zhao, M. Q. Ge, J. Gu, Q. J. Xu, J. Y. Zhai , Z. G. Zong, L. Zhang, L. Q. Liu, “Research and Development of 1.3 GHz Low Loss Cavities Made of China Large Grain at IHEP”, SRF 2007 [3] ZONG Zhan-Guo, GAO Jie, K. Saito, XU Qing-Jin, F. Furuta,Y. J. Shim, T. Saeki, H. Inoue, ZHAI Ji-Yuan, GE Ming-Qi, GU Jun, LIU Li-Qiang, ZHANG Liang, “Experimental study on SC RF cavities by using China large grain niobium for ILC”, Chinese Physics C, Vol. 32, No. 2, Feb., 2008: 151-155 [4] Z. G. Zong, J. Gao, H. Sun, F. C. Zhao, J. Gu, M. Q. Ge, Q. J. Xu, J.Y. Zhai, D. Wang, T. X. Zhao, L. Q. Liu, L. Zhang, L. Y. Xiong, K. Saito, F. Furuta, T. Saeki, “Tests on the 1.3 GHz Low Loss Single-cell RF Superconducting Large Grain Cavities of IHEP”, EPAC08, Genoa, June 2008, MOPP168, p.943 [5] Z.G. Zong, J. Gao, K. Saito, “Performance Comparison of the Large Grain Cavities Treated by EP and CP”, TU4PBC03, PAC09 [6] ZONG Zhan-Guo, GAO Jie, GU Jun, SUN Hong, ZHAO Fa-Cheng, GE Ming-Qi, XU Qing-Jin, ZHAI Ji-Yuan, YUAN Hong, CHEN Jin-Zhe, XIE Wei-Ping, K. Saito, F. Furuta, T. Saeki, LIU Li-Qiang, ZHANG Liang, “Study on the 1.3 GHz low loss shape superconducting cavities at IHEP”, Chinese Physics C, Vol. 33, No. 6, Jun., 2009: 1-6 [7] J. Gao, Y.L. Chi, J.Y. Zhai et al, “ILC 1.3 GHz Superconducting RF Technology Development Program at IHEP”, PAC09, Vancouver, Canada, 2009 [8] J. Gao, Y.L. Chi, J.Y. Zhai et al, “IHEP 1.3 GHz SCRF Technology R&D Progress”, SRF09, Berlin, Germany, September 2009, TUPPO002, p. 168 [9] J. Gao, Y.L. Chi, J.Y. Zhai et al, “Dumbbell Fabrication and Tuning of the IHEP Large Grain 9-cell Cavity”, SRF09, Berlin, Germany, September 2009, THPPO067, p. 769 [10] J. Gao, Y.L. Chi, J.Y. Zhai et al, “IHEP 1.3 GHz SRF Technology R&D Progress”, IPAC10, Kyoto, Japan. [11] J. Gao, J. Y. Zhai, Z. Q. Li, “IHEP Low-loss large grain 9-cell Cavity Fabrication and Processing”, IPAC10, Kyoto, Japan, p. 2974 THP120Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan102403 Technology3A Superconducting RF