superconducting cavities
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Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7654
Author(s):  
Song Jin ◽  
Peng Sha ◽  
Weimin Pan ◽  
Jiyuan Zhai ◽  
Zhenghui Mi ◽  
...  

A circular electron positron collider (CEPC) will adopt hundreds of 650-MHz superconducting cavities with high quality factor (Q) and accelerating gradient (Eacc). Two 650-MHz single-cell cavities made of fine-grain niobium were first treated via buffered chemical polishing (BCP), which was easy and convenient. However, the vertical test results could not meet the specification of the CEPC (4 × 1010 at 22 MV/m). Therefore, electro-polishing (EP) of 650-MHz single-cell cavities was conducted, which was complicated but remarkably effective. Both 650-MHz single-cell cavities achieved state-of-the-art gradients of 35 MV/m after the EP process, which is extremely high for large elliptical cavities (frequency < 1 GHz). One cavity achieved an intrinsic quality factor (Q0) of 4.5 × 1010 at 22.0 MV/m, which was higher than the CEPC spec. The other cavity obtained a lower Q0 of 3.4 × 1010 at 22.0 MV/m, which may have resulted from the cancellation of high-temperature annealing.


2021 ◽  
Vol 16 (11) ◽  
pp. P11003
Author(s):  
L. Guo ◽  
P. Zhang ◽  
X. Zhang ◽  
H. Zheng ◽  
F. Meng ◽  
...  

Author(s):  
Junyoung Yoon ◽  
Chong Shik Park ◽  
Jungbae Bahng ◽  
Kyung-Ryul Kim ◽  
Seong Hee Park ◽  
...  

Author(s):  
Feisi He ◽  
Weimin Pan ◽  
Peng Sha ◽  
Jiyuan Zhai ◽  
Zhenghui Mi ◽  
...  

2021 ◽  
Vol 92 (2) ◽  
pp. 023307
Author(s):  
M. Bertucci ◽  
A. Bosotti ◽  
R. Campari ◽  
A. D’Ambros ◽  
A. Gresele ◽  
...  

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