Conveners
M2Po2E - LTS Cables - Fabrication and Characterization
- Milan Majoros (The Ohio State University)
- Karl Hartwig (Texas A&M University)
Current-sharing was measured for fully-excited Nb3Sn Rutherford cable at 4.2 K and various I/Ic, using a superconducting transformer. Interstrand contact resistance was modified by different preparation conditions: as-is and low temperature vacuum diffusion bonding. Measurements were performed in pool boiling liquid helium in background fields of up to 15 T with magnetic fields applied...
Interconductor contact resistance (ICR) is a key property in determining the stability and current sharing of coated conductor cables. Most coated conductor cables have relatively high contact resistance and low current sharing as fabricated because of surface asperities and the oxide layer that forms on the Cu-stabilizer. Here we work to quantify the induced differences in using three methods...
HTS tapes, because of their widths and large shape aspect ratios, have not been readily manufacturable into Rutherford or Roebel cables, even though these kinds of cables are required for many large coil applications. A type of transposed Roebel cable is under development with 2G tape, but its design flexibility is limited, its processing is very complex, and it requires that much of the 2G...
Reinforced round Bi2212-based, high temperature superconducting wires and transposed cables are being developed for use in coils that are problematic with wide HTS tapes, and that need to operate beyond the limits of low temperature superconductors. This paper describes advances in the development of our strong round HTS 2212 wire, scale up to production lengths and fabrication into transposed...
Finite Element Method (FEM) modeling of stability and current sharing in Nb3Sn Rutherford cables was performed. Different values of contact resistances Ra and Rc were selected based on previous values extracted from loss measurements, as well as a set of design values. Current sharing was then projected for these cases. FEM models which mimic the QXF1055z-D cable (here named Q6 cable) and the...
High-temperature superconductor composites, such as coated conductor-based CORC and Bi2212-based cables, are being considered for high field magnets to be used in particle accelerators. Strand magnetization can degrade the magnetic field quality by introducing error fields, and flux creep may lead to drift in the magnetic field value during magnetic field ramp holding sequences, such as at...
