Researches on Bake Effect on RF Superconducting Cavities

HAO Jian-Kui; ZHAO Kui; ZHU Feng

Chinese Physics C> 2005, Vol. 29> Issue(9) : 918-922

Researches on Bake Effect on RF Superconducting Cavities

MOE Key Laboratory of Heavy Ion Physics, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

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Abstract：
The Q-slope at high gradient affects the performance of superconducting cavity greatly. Recent researches show that low temperature (100—150)°C heat treatment (bake) has positive effects on the performance of superconducting cavities. A lot of cavity tests are analyzed based on bake treatment. The average gradient E_{acc, max} and Eacc at Q=1×10¹⁰ are increased by more than 3.5MV/m. Q at E_{acc, max} is increased and the Q-slope is improved. Analysis on bake temperature shows that higher bake temperature leads to higher Q value. Comparison of BCP and EP cavities shows that at least 60—80μm EP is needed for BCP surface. More than 10—15μm removal of the surface by BCP will degrade the performance of an EP cavity. Oxygen diffusion model is used to illustrate bake effect.

References

[1]

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HAO Jian-Kui, ZHAO Kui and ZHU Feng. Researches on Bake Effect on RF Superconducting Cavities[J]. Chinese Physics C, 2005, 29(9): 918-922.

HAO Jian-Kui, ZHAO Kui and ZHU Feng. Researches on Bake Effect on RF Superconducting Cavities[J]. Chinese Physics C, 2005, 29(9): 918-922. shu

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Received: 2005-01-07
Revised: 1900-01-01

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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

Researches on Bake Effect on RF Superconducting Cavities

Corresponding author: HAO Jian-Kui,

MOE Key Laboratory of Heavy Ion Physics, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

Received Date: 2005-01-07

Accepted Date: 1900-01-01

Available Online: 2005-09-05

Abstract: The Q-slope at high gradient affects the performance of superconducting cavity greatly. Recent researches show that low temperature (100—150)°C heat treatment (bake) has positive effects on the performance of superconducting cavities. A lot of cavity tests are analyzed based on bake treatment. The average gradient E_{acc, max} and Eacc at Q=1×10¹⁰ are increased by more than 3.5MV/m. Q at E_{acc, max} is increased and the Q-slope is improved. Analysis on bake temperature shows that higher bake temperature leads to higher Q value. Comparison of BCP and EP cavities shows that at least 60—80μm EP is needed for BCP surface. More than 10—15μm removal of the surface by BCP will degrade the performance of an EP cavity. Oxygen diffusion model is used to illustrate bake effect.

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Researches on Bake Effect on RF Superconducting Cavities

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通讯作者: 陈斌, bchen63@163.com

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