Researches on the Electromagnetic Field in RF Superconducting Cavities

  • Q-drop phenomenon usually occurs in RF superconducting cavities made from high pure niobium at high field level. This is caused by the enhancement of local magnetic field at the surface of the niobium cavities. To study the electromagnetic performances of the superconducting cavities at high field, a series of experiments are designed with single cell niobium cavity. By the measurements of the peak surface magnetic field of the cavity, the defects in the cavity can be located with special method. Effective treatments can be used to improve the properties of the superconducting cavities.
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  • [1] Visentin B et al. Cavity Baking: a Cure for the High Accelerator Field Q0 Drop. In Pros. of the 9th Workshop on RF Superconductivity. USA:Los Alamos National Laboratory, 1999.1982 Halbritter J. IEEE Trans. on Appl. Supercom.,2001,11: 18643 Safa H. High Field Behavior of SCRF Cavities. In Pros. of the 10th Workshop on RF Superconductivity. Tsukuba: KEK, 2001.279-2864 Knolbloch J et al. High Field Q Slope in SC Cavities Due to Magnetic Field Enhancement at Grain Boundaries. In Pros. of the 9th Workshop on RF Superconductivity. USA: Los Alamos National Laboratory. 1999.775 Padamsee J, Knobloch J, Hays T. RF Superconductivity for Accelera-torn. New York: John Wiley Sons, Inc,1998. 476 Young L, Billen J. User' s Guide of POISSON SUPERFISH Codes.USA: Los Alamos National Laboratory,2002.1607 Brinkmann R, Floettmann K, Rossbach J et al. TESIA Technical Design Report. Hamburg: DES7,2001,II-248 HAO Jiankui et al. Low Temperature Heat Treatment Effect on High Field EP Cavities. In Pmc. of the 11th Workshop on RF Supemonductivity. Travemunde: DESY, 2003. MoP169 Proch D et al. Dry Ice Cleaning for SRF Applications. In Pmc. of the 10th Workshop on RF Superconductivity. Tsukuba: KEK, 2001, 463-46610 Geng R L et al. Testing the First 1300MHz Reentrant Cavity. SRF Reports of Comell University: SRF 041108-05
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HAO Jian-Kui, HUANG Sen-Lin, ZHU Feng, QUAN Sheng-Wen and ZHAO Kui. Researches on the Electromagnetic Field in RF Superconducting Cavities[J]. Chinese Physics C, 2005, 29(8): 806-809.
HAO Jian-Kui, HUANG Sen-Lin, ZHU Feng, QUAN Sheng-Wen and ZHAO Kui. Researches on the Electromagnetic Field in RF Superconducting Cavities[J]. Chinese Physics C, 2005, 29(8): 806-809. shu
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Received: 2004-11-25
Revised: 1900-01-01
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Researches on the Electromagnetic Field in 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

Abstract: Q-drop phenomenon usually occurs in RF superconducting cavities made from high pure niobium at high field level. This is caused by the enhancement of local magnetic field at the surface of the niobium cavities. To study the electromagnetic performances of the superconducting cavities at high field, a series of experiments are designed with single cell niobium cavity. By the measurements of the peak surface magnetic field of the cavity, the defects in the cavity can be located with special method. Effective treatments can be used to improve the properties of the superconducting cavities.

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