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]

. Visentin B et al. Cavity Baking: a Cure for the High Accelerator Field Q0 Drop. Proc. of the 9th Workshop on RF Superconductivity. Los Alamos National Laboratory, 1999.1982. Safa H. High Field Behavior of SCRF Cavities. Proc. of the 10th Workshop on RF Superconductivity. Tsukuba: KEK,2001. 2793. Lilje L et al. Electropolishing and In-Situ Baking of 1.3GHz Niobium Cavities. Proc. of the 9th Workshop on RF Superconductivity. Los Alamos National Laboratory, 1999. 744. Lilje L. High Accelerating Gradient in 1.3GHz Niobium Cavities. Proc. of the 10th Workshop on RF Superconductivity. Tsukuba: KEK, 2001. 2875. Kneisel P. Preliminary Experience with In-Situ Baking of Niobium Cavities. Proc. of the 9th Workshop on RF Superconductivity. Los Alamos National Laboratory, 1999. 3286. Visentin B. Change of RF Superconducting Parameters Induced by Heat Treatment on Niobium Cavities. Proc. of the 2001 Particle Accelerator Conference. Chicago: ANL,2001. 10567. Brinkmann R, Floettmann K, Rossbach J et al. TESLA Technical Design Report. Hamburg:DESY, 2001. Ⅱ-148. Palmer F L. IEEE Trans. Magn., 1987, 23(2): 16179. Grundner M, Halbritter J. J. Appl. Phys., 1979, 51: 39710. Bonin B. Materials for Superconducting Cavities. Proc. of CERN Accelerator School CERN96-03. Hamburg, 1996.19111. Hagen M. Internal Report, WU D 88-8. University of Wuppertal, March 198812. Knobloch J et al. High Field Q Slope in SC Cavities due to Magnetic Field Enhancement at Grain Boundaries. Proc. of the 9th Workshop on RF Superconductivity. Los Alamos National Laboratory, 1999. 7713. Halbritter J. Material Science of Nb RF Accelerator Cavities: Where doWe Stand 2001? Proc. of the 10thWorkshop on RF Superconductivity. Tsukuba: KEK, 2001. 29214. Halbritter J. IEEE Trans. on Appl. Supercond, 2001, 11:1864

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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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