Influence of Fast Neutron Irradiation on Critical Current Densities of Bi-2223/Ag Tape

(整期优先)网络出版时间:2004-02-03
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ExperimentalresultsonthemagneticfieldbehaviorofthecriticalcurrentinsilversheathedBi-2223tapesarepresented.Theexperimentsconsistoftransportandmagneticmeasurementsinawidetemperaturerangeandinexternalmagneticfieldupto6T.SignificantenhancementoftheintragraincriticalcurrentdensitiesJcareobservedafterirradiationwithfastneutron.Thisisattributedtoanimprovementoffluxpinningcapabilitybytheneutroninduceddefects,buttheweaklinkstructureissomewhatdamagedasevidencedbythesmalldegradationoftransportcriticalcurrentatlowfield.Accordingtothemeasurementofremanentmagneticmomentbeforeandafterirradiationwithfastneutron,theconnectivityinBi-2223tapesisreducedby50%afterirradiatedtoafluenceof2×1021m-2,whichresultedinthecriticalcurrentsdegradatedbyafactorof10%.