AC Loss Reduction of YBCO Coated Conductors by Multifilamentary Structure
Journal article (postprint)
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
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Large cross-sectional aspect ratios of YBCO coated conductors leads to large magnetization loss in AC transverse magnetic field. In this work, the magnetization loss of multifilamentary YBCO coated conductors was studied experimentally. A 100 mm length of striated multifilamentary YBCO coated conductor was prepared with the conductor and filaments 10 mm wide and 0.4 mm wide, respectively. Laser ablation was used to make the samples striations. Magnetization loss of the striated conductor and reference nonstriated conductor was measured in AC transverse magnetic fields normal to the conductor at various frequencies. Measured loss of the 100 mm striated conductor was 9 of the measured loss of the nonstriated conductor at f11.3 Hz and HHcc8.8. Even though the coupling loss component increases the magnetization loss in the striated conductor, the AC loss reduction by striation is still clear at 171.0 Hz. Transverse resistance between filaments estimated by four-probe measurement was 38 for 1 m at 80 K. Estimated coupling length is much longer than the sample length at 171.0 Hz, suggesting that filaments in striated conductors are far from completely coupled.
- Coatings, Colorants and Finishes
- Electricity and Magnetism