The integration of REBCO superconducting coils into compact tokamak toroidal field magnets represents a transformative advancement in fusion technology.In the fabrication of these magnets,electrical connections betwee...The integration of REBCO superconducting coils into compact tokamak toroidal field magnets represents a transformative advancement in fusion technology.In the fabrication of these magnets,electrical connections between pancake coils are typically established through a transverse bridging joint,the performance of which critically impacts device efficiency.To address the demand for enhanced connectivity,this study presents a novel bridge-type"stacked joint"utilizing a superconducting-copper composite structure,optimized for inter-coil connections of stacked REBCO cables.Leveraging a modular stacking approach and low-temperature soldering,this design achieves a resistance as low as 1 nΩover a 10 cm length alongside a soldering resistivity below 25 nΩcm^(2)in a liquid nitrogen(77 K)self-field environment.The study further investigates the impact of tape length and quantity on joint electrical performance under this configuration.Rigorous testing,including 10 thermal cycles(77 K to room temperature)and pressure loads up to 30 MPa,confirms the joint’s structural reliability and the consistency of the fabrication process,underscoring its potential for fusion applications.展开更多
基金National MCF Energy R&D Program under Grant 2022YFE03150103in part by CTRFR project(Compact-Tokamak based repetitive Reconnection-heated Fusion Reactor)from Shaanxi Startorus Fusion Technology Co.,Ltd.
文摘The integration of REBCO superconducting coils into compact tokamak toroidal field magnets represents a transformative advancement in fusion technology.In the fabrication of these magnets,electrical connections between pancake coils are typically established through a transverse bridging joint,the performance of which critically impacts device efficiency.To address the demand for enhanced connectivity,this study presents a novel bridge-type"stacked joint"utilizing a superconducting-copper composite structure,optimized for inter-coil connections of stacked REBCO cables.Leveraging a modular stacking approach and low-temperature soldering,this design achieves a resistance as low as 1 nΩover a 10 cm length alongside a soldering resistivity below 25 nΩcm^(2)in a liquid nitrogen(77 K)self-field environment.The study further investigates the impact of tape length and quantity on joint electrical performance under this configuration.Rigorous testing,including 10 thermal cycles(77 K to room temperature)and pressure loads up to 30 MPa,confirms the joint’s structural reliability and the consistency of the fabrication process,underscoring its potential for fusion applications.
