Presentation Information
[WBP1-07]Development and manufacturing of REBCO 2G-HTS wires for low field applications using PLD process
*Hoa Thi Dao1, Ivan Veshchunov1, Vladimir Vyatkin1, Kamil Etxagibel1, Marat Gaifullin1, Sergey Samoilenkov1, Valery Petrykin1, Sergey Lee1 (1. Faraday Factory Japan LLC (Japan))
Keywords:
2D-HTS wires,REBCO,multilayers,PLD,low field applications,EBCO,EBHO,GdBCO
In large-scale manufacturing, the PLD process has clear advantages compared to other physical methods, particularly in deposition rate and simplicity of chamber configuration. This method has been well employed at Faraday Factory Japan (FFJ) for high-temperature superconducting (2G-HTS) wire production with a capacity of over 1,000 km annually. While YBa2Cu3O7-x (YBCO, including Y2O3 modified variants) is our main product for low-temperature and high-field applications, here we focus on “light-RE” compositions for cable and motor use: GdBa2Cu3O7-x (GdBCO) and EuBa2Cu3O7-x (EBCO). We also include results on multilayer structures and materials with BaHfO3 (BHO) artificial pinning centers doped in EuBa2Cu3O7-x (EBHO).
The quality of 2G-HTS wires was assessed via X-ray diffraction for crystalline structure, SEM for morphology, and transport Ic measurements using the four-probe method at self-field and high field for superconducting performance. Long-length current uniformity was evaluated using TapeStar XL (Theva). Recent 12-mm tapes with optimized RE composition series have achieved Ic ≈ 1,000 A at 77 K, self-field (Fig. 1). We have also successfully reduced the field angle-dependence in REBCO tapes for motor application (Fig. 2).
In this presentation, the effects of PLD parameters, such as pressure, temperature, laser/beam optics, etc., on crystalline structure, HTS film morphology, and superconducting transport properties of Eu- and Gd-based 2G-HTS wires will be described. Important issues encountered during increasing deposition-rate and up-scaling will also be discussed.
The quality of 2G-HTS wires was assessed via X-ray diffraction for crystalline structure, SEM for morphology, and transport Ic measurements using the four-probe method at self-field and high field for superconducting performance. Long-length current uniformity was evaluated using TapeStar XL (Theva). Recent 12-mm tapes with optimized RE composition series have achieved Ic ≈ 1,000 A at 77 K, self-field (Fig. 1). We have also successfully reduced the field angle-dependence in REBCO tapes for motor application (Fig. 2).
In this presentation, the effects of PLD parameters, such as pressure, temperature, laser/beam optics, etc., on crystalline structure, HTS film morphology, and superconducting transport properties of Eu- and Gd-based 2G-HTS wires will be described. Important issues encountered during increasing deposition-rate and up-scaling will also be discussed.