IEEE Transactions on Applied Superconductivity - new TOC TOC Alert for Publication# 77
- A Novel Aluminum-Stabilized Stacked REBCO Tape Cableel febrero 6, 2024 a las 1:19 pm
In the new concept design of the circular electron positron collider detector, the magnet should be an ultrathin HTS solenoid with maximum radiation transparency. A novel aluminum-stabilized stacked REBCO tape cable (ASTC) was proposed and developed. The advantages of aluminum's high residual resistivity ratio, high thermal conductivity, and high transparency for particles, combined with the advantages of REBCO tape's high engineering current density, high strength and large temperature margin, constitute a suitable cable option for future detector magnets. The ASTC uses REBCO tapes in a stacked structure, which are wrapped and bound with metal tapes, and then covered with aluminum stabilizer by coextrusion processing. By optimizing the process parameters, such as preheating temperature, extrusion speed, Al outer layer thickness, and improving the internal structure of the cable, the critical current of the ASTC prototype cable is increased to 905 A@ 77 K, self-field. The degradation of the tape is less than 20%. This article presents the development process of the ASTC cable, discusses the challenges encountered during cable processing, and proposes corresponding solutions.
- Structural Design and Mechanical Analysis of HTS CICC Made From Twisted Stack Slotted-Core Cableel enero 30, 2024 a las 1:17 pm
To meet the parameters of the toroidal field (TF) magnet of the China Fusion Engineering Test Reactor, this article proposes a high-temperature superconducting cable-in-conduit conductor with two support structures composed of six twisted stack slotted-core cables (TSSC), which is designed to target current 100 kA at 4.2 K temperature in a background magnetic field of up to 20 T. Therefore, the enormous transverse electromagnetic load must be considered in the design process to ensure the operation safety and stability of the conductor. The influence of transverse Lorentz force on the cable stress distribution and deformation displacement is analyzed based on finite-element analysis. The improved 2-D numerical model is established to reduce the problem of long computation time so that the mechanical feasibility of the conductor structure can be quickly evaluated. The calculation results show that the outermost layer of the REBCO tapes, where the tape stack is in contact with the solder, is subjected to the highest stresses (less than 35 MPa), and the conductors with two different support structures do not plastically deform under transverse electromagnetic load. The experimental results indicate that the maximum transverse load applied reaches 140 MPa, and the critical current of the TSSC cable does not show any recession, which provides a potential solution for the application of high-field magnets.
- Partial Force Calculation and Structural Strength Analysis of Null-Flux Coil for Superconducting Electrodynamic Suspension Trainel enero 29, 2024 a las 1:16 pm
The superconducting electrodynamic suspension train has advantages such as a large suspension gap and a high lift-to-drag ratio. Its ground coils are made of ironless hollow windings laid along the track. Due to the strong magnetic field generated by the onboard superconducting magnets, the train exerts instant and intense stress on the coils when passing through. This article proposed four kinds of track coils with different fixed structures, and investigated the structural strength by an analytical-simulation coupling analysis method. First, the 3-D electromagnetic force distribution model of the actual track coil was established, and the load distribution of each coil was accurately characterized. Then, four kinds of fixed methods of the track coil were proposed and their mode analysis was carried out. Subsequently, the loading capacity of four kinds of track coils under extreme stress load was studied by static loading analysis. Finally, through the transient stress analysis, the stress variation of four kinds of track coils during the actual operation was investigated.