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【英文标准名称】:Superconductivity-Criticalcurrentmeasurement-DCcriticalcurrentofNb3Sncompositesuperconductors
【原文标准名称】:超导性.临界电流测量.Nb3Sn复合超导体的直流临界电流
【标准号】:BSEN61788-2-1999
【标准状态】:作废
【国别】:英国
【发布日期】:2003-03-13
【实施或试行日期】:2003-03-13
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:钛;临界数据;电气工程;测量;超导性;超导体;铌;铜;电流测量
【英文主题词】:
【摘要】:ThispartofIEC61788coversatestmethodforthedeterminationofthed.c.criticalcurrentofNb3Sncompositesuperconductorswhicharefabricatedbyeitherthebronzeprocessortheinternaltindiffusionprocessandhaveacopper/non-copperratiolargerthan0,2.Thismethodisintendedforusewithsuperconductorswhichhavecriticalcurrentsoflessthan1000Aandn-valueslargerthan12understandardtestconditionsandatmagneticfieldsoflessthanorequalto0,7timestheuppercriticalmagneticfield.Thetestspecimenisimmersedinaliquidheliumbathatameasuredtemperatureduringtesting.TheNb3Sncompositetestconductorhasamonolithicstructurewithatotalround-cross-sectionalareathatislessthan2mm.Thespecimengeometryusedinthistestmethodisaninductivelycoiledspecimen.Deviationsfromthistestmethodthatareallowedforroutinetestsandotherspecificrestrictionsaregiveninthisstandard.Nb3Snconductorswithcriticalcurrentsabove1000Aortotalcross-sectionalareasgreaterthan2mmcanbemeasuredwiththepresentmethodwithananticipatedreductioninprecisionandamoresignificantself-fieldeffect(seeannexC).Other,morespecialized,specimentestgeometriesmaybemoreappropriateforlargerconductortestingwhichhavebeenomittedfromthispresentstandardforsimplicityandtoretainprecision.ThetestmethodgiveninthisstandardshouldinprincipleapplytoNb3Sncompositewiresfabricatedbyanyotherprocess,suchasthemodifiedjelly-rollprocess.Thismethodisalsoexpectedtoapplytoothersuperconductingcompositewiresaftersomeappropriatemodifications.
【中国标准分类号】:H80
【国际标准分类号】:29_050
【页数】:34P;A4
【正文语种】:英语