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Description
In order to improve the transmission capability of the second generation REBCO tape, many structures of superconducting strand/cable stacked with REBCO tapes were proposed. In this paper, a compact twisted stack tape conductor (TSTC) with stepped grooves was performed. The stepped groove is divided into long groove and short groove with different number of tapes, and a long copper plate is sandwiched between the two stacking tapes to improve stability, while contributing to distribute fault current. Numerical studies of current-carrying capability and magnetic behavior of these conductors have been carried out by employing a T-A formulation model and a H-homogenized formulation model. The effect of the quantity of grooves and tapes on the critical current is studied by the finite element method, respectively. With 20+10 superconducting tapes configuration, the engineering current density of three stepped grooves structure reaches 1.28×108 A/m2 in an area of 75.51 mm2, which is a significant increase over the usual single-groove stacked cables. Then, the sample of HTS TSTC conductor with three stepped grooves was fabricated, and the critical current was measured at liquid nitrogen temperature and self-field. The test results correspond with simulation.
| Submitters Country | China |
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