Study of Thermomechanical Properties of The Epoxy-Impregnated Cable Composite for a 15 T Nb3Sn Dipole Demonstrator

International Cryogenic Materials Conference 2017

Li, Pei^1 ; Krave, Steve^1 ; Zlobin, Alexander^1

Fermi National Accelerator Laboratory, Batavia

IL

60510, United States^1

关键词: Azimuthal direction;    Fermi national accelerator laboratories;    Hysteresis behaviour;    Insulation materials;    Loading-unloading cycles;    Principal directions;    Super-conducting accelerator magnets;    Thermomechanical properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/279/1/012020/pdf
DOI  :  10.1088/1757-899X/279/1/012020

来源: IOP

【 摘 要 】

The knowledge of the thermomechanical properties of the composite of cable/insulation/epoxy impregnation are important for the design, fabrication and operation of superconducting accelerator magnets. As a part of the 15 T dipole magnet development at Fermi National Accelerator Laboratory (FNAL), we studied the thermomechanical properties of cable stack that represents the cable composites in the 15 T dipole. The measurements include thermal contraction and strain-stress characterization under compressive load along the principal directions. The cable stack samples show hysteresis behaviour in loading-unloading cycles, which is found to be most dramatic along the azimuthal direction. Also, the choice of insulation material/procedure is found to strongly impact the bonding between cables and epoxy/cable layers. The cable stacks measured in this study use E-glass tape wrapping insulation and show weaker bonding to cables than similar cable stacks using S-2 glass sleeves insulation previously studied.