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蒋华伟,武松涛.周期电磁载荷下Nb3Sn导体耦合损耗计算模型[J].稀有金属材料与工程(英文),2018,47(10):2970~2975.[JIANG HuaWei and WU SongTao.Calculation model of coupling loss time constant for Nb3Sn conductor under cyclic electromagnetic load[J].Rare Metal Materials and Engineering,2018,47(10):2970~2975.]
Calculation model of coupling loss time constant for Nb3Sn conductor under cyclic electromagnetic load
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Received:September 09, 2017  Revised:January 29, 2018
DOI:
Key words: coupling loss time constant  cable-in-conduit conductor  cabling sequence ratio  contact resistance  void fraction
Foundation item:国家自然科学基金面上项目(51677055),河南省自然科学基金项目(162300410055)
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JIANG HuaWei and WU SongTao  
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Abstract:
      On ITER (International Thermal Nuclear Experimental Reactor) superconducting fusion device, the Nb3Sn composite strands have been applied to CICC (cable-in-conduit conductor) to meet the impact of the magnet field above 12 T. The strain of Nb3Sn-based conductor due to Lorentz forces leads to the change of critical current and coupling loss time constant. However, the study on critical performance degradation of CICC is still inadequate. Moreover, the most important is that the influence exploration of the contact properties with strain on coupling loss time constant is also insufficient. In order to calculate coupling loss accurately and quickly, a new calculation model of coupling loss time constant was put forward in this paper, which is expressed with a linear equation using some parameters that is the cabling sequence ratio, the contact resistance and the void fraction with strain main from electromagnetic force. In this model, not only the computation expression of cabling sequence ratio is given, but also the contact resistance and the void fraction is obtained with strain (from electromagnetic load cycle). Compared with numerical calculation using Gandalf and traditional method, the error of coupling loss calculated with the combination of the cabling sequence ratio, the contact resistance and the void fraction with strain is small, which is close to the engineering measured value.