Chinese Physics C > 2009, Vol. 33 > Issue(6): 444-449 DOI: 10.1088/1674-1137/33/6/008

Study on the 1.3 GHz low loss shape superconducting cavities at IHEP

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As part of the international research program on the superconducting cavity for the International Linear Collider (ILC) R&D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics (IHEP) since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain (LG) cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing (CP) without electro polishing (EP) at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities's performance.

References

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. Nan Phinney et al. ILC RDR Accelerator. 20072. Saito K. Gradient Yield Improvement Efforts for Single and Multi-cells and Progress for Very High Gradient Cavities.Proc. SRF2007. Beijing, 20073. Sekutowicz J et al. Design of a Low Loss SRF. Cavity forthe ILC. Proc. PAC05. Knoxville, 20054. GENG R L et al. High Gradient Sudies for ILC with Single-cell Re-entrant Shape and Ellipictical Shape Cavities Madeof Fine-grain and Large-grain Niobium. Proc. PAC07. Al-buquerque, 20075. GE Ming-Qi et al. HEP NP, 2006, 30(04): 345-358 (inChinese)6. ZONG Z G, GAO J et al. Research and Development of 1.3 GHz Low Loss Cavities Made of China Large Grain at IHEP. Proc. SRF2007. Beijing 20077. ZONG Zhan-Guo, GAO Jie et al. Chinese Physics C(HEP NP), 2008, 32(02): 151-1558. Ciovati G, Kneisel P. Proc. of the Workshop on Pushingthe Limits of RF superconductivity, Argonne report ANL-05/10. March 2005. 74

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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, LIU Li-Qiang and ZHANG Liang. Study on the 1.3 GHz low loss shape superconducting cavities at IHEP[J]. Chinese Physics C, 2009, 33(6): 444-449. doi: 10.1088/1674-1137/33/6/008

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Received: 2008-08-22
Revised: 2008-11-04

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the 1.3 GHz low loss shape superconducting cavities at IHEP

Corresponding author:ZONG Zhan-Guo,

Received Date:2008-08-22

Accepted Date:2008-11-04

Available Online:2009-06-05

Abstract:

As part of the international research program on the superconducting cavity for the International Linear Collider (ILC) R&D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics (IHEP) since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain (LG) cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing (CP) without electro polishing (EP) at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities's performance.

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Study on the 1.3 GHz low loss shape superconducting cavities at IHEP

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