Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity

GE Ming-Qi; ZHAO Sheng-Chu; SUN Hong; GAO Jie

Chinese Physics C> 2006, Vol. 30> Issue(4) : 354-358

Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity

Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
Superconducting (SC) RF technology is an excellent choice for International Linear Collider (ILC), and the whole cost of ILC is closely related to the gradient of SC cavity. However, the gradient of Nb SC cavity is limited by SRF critical magnetic field at present. So it is very necessary to optimize the cavity shape to decrease the ratio of surface peak magnetic field and accelerating gradient (H_p/E_acc). A serial of new cavity shapes have been proposed including Low Loss shape and Re-Entrant shape etc. Low Loss shape has lower H_p/E_acc than Re-Entrant shape, so theoretically Low Loss shape can reach higher gradient. In this paper, an optimal design is illustrated. Then a Low Loss SC Cavity shape and its calculation results are presented, and finally these results are compared with TESLA 800 cavity and Re-Entrant Cavity.

References

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. Adolphsen C. Cost and Operational Implications of the Gradient Choice, 1st ILC-WS. 20042. Saito K et al. Proc. of the 29th Linear Accelerator Meeting.2004. 81—833. Saito K et al. Proc. of the SRF2001. 2001. 588—5904. Singer W et al. Proc. of the SRF2001. 2001. 170—1765. ZHANG Yu-Heng. Superconductive Physics. Hefei: University of Science and Technique of China Publisher, 1997.209—214(in Chinese)(张裕恒.超导物理.合肥:中国科学技术大学出版社,1997.209-214 )6. Sekutowicz J et al. Proc.of the 2003 Particle AcceleratorConf. 2003. 1395—13977. Shemelin V, Padamsee H et al. Nucl. Instrum. Methods,2003, A496(1): 1—78. Sekutowicz J. New Cavity Shapes for Higher Gradient, 1stILC-WS. 20049. ZHAO Sheng-Chu, SUN Hong et al. Journal of the Gradu-ate School of the Chinese Academy of Sciences, 2003, 20(1):57—61(in Chinese)(赵升初,孙虾等.中国科学院研究生院学报,2003, 20(1):57-61)10. Aune B et al. Phys. Rev. ST Accel. Beams, 2000, 3: 092001

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GE Ming-Qi, ZHAO Sheng-Chu, SUN Hong and GAO Jie. Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity[J]. Chinese Physics C, 2006, 30(4): 354-358.

GE Ming-Qi, ZHAO Sheng-Chu, SUN Hong and GAO Jie. Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity[J]. Chinese Physics C, 2006, 30(4): 354-358. shu

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Received: 2005-08-22
Revised: 2005-11-22

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沈阳化工大学材料科学与工程学院沈阳 110142

Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity

Corresponding author: SUN Hong,

Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2005-08-22
Accepted Date: 2005-11-22
Available Online: 2006-04-05

Abstract: Superconducting (SC) RF technology is an excellent choice for International Linear Collider (ILC), and the whole cost of ILC is closely related to the gradient of SC cavity. However, the gradient of Nb SC cavity is limited by SRF critical magnetic field at present. So it is very necessary to optimize the cavity shape to decrease the ratio of surface peak magnetic field and accelerating gradient (H_p/E_acc). A serial of new cavity shapes have been proposed including Low Loss shape and Re-Entrant shape etc. Low Loss shape has lower H_p/E_acc than Re-Entrant shape, so theoretically Low Loss shape can reach higher gradient. In this paper, an optimal design is illustrated. Then a Low Loss SC Cavity shape and its calculation results are presented, and finally these results are compared with TESLA 800 cavity and Re-Entrant Cavity.