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<p>Against the backdrop of the accelerated advancement of the International Thermonuclear Experimental Reactor project, the Central Solenoid Model Coil (CSMC) of the China Fusion Engineering Test Reactor (CFETR) plays a pivotal role in achieving efficient plasma confinement and control. During the assembly of CSMC, inevitable assembly errors can disrupt both the central symmetry around the central axis and the planar symmetry with respect to the mid-plane of the Nb₃Sn and NbTi coils. This symmetry disruption leads to the generation of substantial asymmetric radial and axial offset electromagnetic forces within the Nb₃Sn and NbTi coils, which potentially jeopardize the preload stability and structural integrity of supporting components. To systematically investigate the stability of CSMC under the influence of assembly errors, this study first established a calculation model based on electromagnetic field theory for three typical assembly error scenarios, followed by the computation of corresponding offset electromagnetic forces. Second, the linear instability analysis method was utilized to determine the instability modes of CSMC under different offset electromagnetic force conditions. Finally, an extreme offset state was selected for nonlinear instability analysis to quantify the critical load triggering instability. The research results indicate that, under extreme assembly errors, preload rods emerge as the weakest structural components susceptible to instability. Notably, the critical instability load demonstrates an 8.3-fold margin over the combined operational loads. This study offers critical data references for optimizing the assembly precision and conducting safety margin evaluations in CSMC operation.</p>

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Structural Stability of CFETR Central Solenoid Model Coil Under Assembly-Induced Offsets: Electromagnetic Loads and Instability Evaluation

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Xianewei Wang,
  • Wenlong Xu,
  • Chenyang Li,
  • Aihua Xu,
  • Wentao Xie,
  • Xiulian Li

摘要

Against the backdrop of the accelerated advancement of the International Thermonuclear Experimental Reactor project, the Central Solenoid Model Coil (CSMC) of the China Fusion Engineering Test Reactor (CFETR) plays a pivotal role in achieving efficient plasma confinement and control. During the assembly of CSMC, inevitable assembly errors can disrupt both the central symmetry around the central axis and the planar symmetry with respect to the mid-plane of the Nb₃Sn and NbTi coils. This symmetry disruption leads to the generation of substantial asymmetric radial and axial offset electromagnetic forces within the Nb₃Sn and NbTi coils, which potentially jeopardize the preload stability and structural integrity of supporting components. To systematically investigate the stability of CSMC under the influence of assembly errors, this study first established a calculation model based on electromagnetic field theory for three typical assembly error scenarios, followed by the computation of corresponding offset electromagnetic forces. Second, the linear instability analysis method was utilized to determine the instability modes of CSMC under different offset electromagnetic force conditions. Finally, an extreme offset state was selected for nonlinear instability analysis to quantify the critical load triggering instability. The research results indicate that, under extreme assembly errors, preload rods emerge as the weakest structural components susceptible to instability. Notably, the critical instability load demonstrates an 8.3-fold margin over the combined operational loads. This study offers critical data references for optimizing the assembly precision and conducting safety margin evaluations in CSMC operation.