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There have been great advancements in the 2nd generation (2G) high temperature superconductors (HTS) wires termed coated conductors (CCs). Nevertheless, due to the high aspect ratio and the nature of metallic substrates, AC loss is a serious problem for the coated conductors. In this paper, we present a novel approach of fabrication of thin faceted sapphire fibers as substrates for YBCO film growth...