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1、Atransformativesuperconductingmagnettechnologyforfieldswellabove30TusingisotropicroundwiremultifilamentBi2Sr2CaCu2O8-xconductor111121D.C.Larbalestier,J.Jiang,U.P.Trociewitz,F.Kametani,C.Scheuerlein,M.Dalban-Canassy,M.11111Matras,P.Chen,N.C.Craig,P.J.LeeandE.E.Hellstrom1App
2、liedSuperconductivityCenter,NationalHighMagneticFieldLaboratory,FloridaStateUniversity,2031EastPaulDiracDrive,Tallahassee,FL32310USA2EuropeanOrganizationforNuclearResearch,CH-1211Geneva,SwitzerlandApril9,2013Wereportherethatmagneticfieldsofalmost34T,farabovetheupper24Tlimi
3、tofNb3Sn,canbegeneratedusingamultifilamentroundwireconductormadeofthehightemperaturecupratesuperconductorBi2Sr2CaCu2O8-x(Bi-2212).AremarkableattributeofthisBi-2212conductoristhatitdoesnotexhibitmacroscopictextureandcontainsmanyhighanglegrainboundariesbutnevertheless2attain
4、sveryhighsuperconductingcriticalcurrentdensitiesJcof2500A/mmat20Tand4.2K.ThisBi-2212conductordoesnotpossesstheextremetexturethathighJccoatedconductorsofREBa2Cu3O7-x(REBCO)require,avoidingalsoitshighaspectratio,largesuperconductinganisotropyandtheinherentsensitivitytodefect
5、sofasinglefilamentconductor.Bi-2212wirescanbewoundorcabledintoalmostanytypeofsuperconductingmagnetandwillbeespeciallyvaluableforveryhighfieldNMRmagnetsbeyondthepresent1GHzprotonresonancelimitofNb3Sntechnology.ThisdemonstrationthatgrainboundarylimitstohighJccanbepractically
6、overcomesuggeststhehugevalueofarenewedfocusongrainboundarypropertiesinnon-idealgeometries,especiallywiththegoaloftranslatingthelessonsofthisBi-2212conductorintofabricationofmultifilamentroundwireREBCOorFe-basedsuperconductors.1Anyconductorforsuperconductingapplicationsmust
7、develophighcriticalcurrentdensity,Jc,inlonglengthform.Thedifficultyofachievingthehugeapplicationdreamsoftheearly1990sforthecupratehightemperaturesuperconductors(HTS)hasverylargelyrevolvedaroundthecomplexityofmakinghighJcinpolycrystallineconductorforms,becauseofthehugecurre
8、ntblockingeffectsofrandomly1,2orientedgrainboundaries.Theprincipalsolutionpursuedupuntiln
