CuCu-Sn（（ブブロロンンズズ））合合金金（（ CuSSCuSS + CuSS + Nb3Sn + Nb3Sn + CuSSNbSS + Nb3Sn + CuSSNbNb3Sn Nb6Sn5 NbSn2Sn））Neutral axis: Center of the wireBending limit: Diameter of the wireCoil winding : Wind & React (Typically)Neutral axis: Center of each ultra-fine strandBending limit: Diameter of the ultra-fine strandCoil winding : React & Wind (Strongly expected)4.2 KStrand：OFC sheathed mono core MgB2Strand Diameter：0.05mmBarrier Material : Pure NbCu/non Cu ratio：1.0Number of Strand：49Twist Pitch Length：8.0mmTwist Pitch Direction：Right hand (S)Cable Diameter：0.4 mmP2-170(3) 49 Stranded Cable (49/0.05)(3) 49 Stranded Cable (49/0.05)(4) The World Finest 15 m MgB2 Wire AimNb3Sn (Niobium Tin)Conclusion We have succeeded in developing the ultrafine Nb3Al,Nb3Sn, and MgB2 superconducting wire, much thinnerthan a human hair. Those ultrafine stranded cables show remarkablyflexible characteristics and are expected to show lowAC losses, as well. We will promote research and development ofadvanced superconducting wires aimed at applicationto new electric aircraft and liquid hydrogen pumps thatthe cominguse cold heat ofhydrogen society.(3) Bending Effects(1) Jelly Roll Process(2) Superconducting Properties(1) In-Situ Powder-In-Tube (PIT) Process(2) Superconducting Properties(4) Bending Effectsliquid hydrogen for(1) Minimize Bending Strain(2) Minimize AC Loss(1) Bronze Process(2) 49 Stranded Cable (7/7/0.05)Nb3Al (Niobium Aluminum)MgB2 (Magnesium Diboride)Future PlanKey Words: Superconducting Wires, Ultrafine Strands, Flexible Compound CablesKey Words: Superconducting Wires, Ultrafine Strands, Flexible Compound CablesTheme underDiscussionDiscussionIn the trend toward a low-carbon society and other efforts to improve human sustainability,there is a strong demand for a shift from fossil fuels to hydrogen for aircraft, automobiles,generators, as well as the early realization of nuclear fusion reactors. Superconducting wiresplay an important role in these major technological innovations, and the emergence of newsuperconducting wires that can be used in a variety of applications is eagerly awaited.Superconducting wires with excellent critical properties are often challenging to fabricate intowires because most of these materials are mechanically brittle, such as intermetallic compounds,borides, and oxides. However, even brittle wires can exhibit excellent flexibility if they aremade with extremely fine diameters, like glass fiber. In this research, we aim to developflexible, high-performance superconducting conductors that can be utilized in variousapplications by bundling ultra-fine wires.Advanced Superconducting Wire Group, GREEN Akihiro KikuchiE-mail：： KIKUCHI.Akihiro@nims.go.jpIntroductionDevelopment of the Ultrafine Development of the Ultrafine Superconducting Wires and Flexible CablesSuperconducting Wires and Flexible Cables
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