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1、Publishedonline：2017-04-2511:57:19URL：http://kns.cnki.net/kcms/detail/51.1311.O4.20170425.1157.032.html第29卷第6期强激光与粒子束Vol.29,No.62017年6月HIGHPOWERLASERANDPARTICLEBEAMSJun.,2017Thermalconductivityinvestigationoflargegrain*niobiummaterialusedforfabricationofSRFcavitiesChenL
2、izhi,HaoJiankui,ChenShu,NiZhimao,GuoXin,LiuKexin(StateKeyLaboratoryofNuclearPhysicsandTechnology,InstituteofHeavyIonPhysics,SchoolofPhysics,PekingUniversity,Beijing100871,China)Abstract:Largegrainniobiumhasgoodthermalconductivityat2Ktemperaturebecauseofthephononpeak,whi
3、chishelpfultoimprovethethermalstabilityofsuperconductingcavities.Theinvestigationintother-malconductivityandcrystalimperfectionofthelargegrainniobiummaterialdevelopedbyNingxiaOrientTan-talumIndustryCo.,Ltd(OTIC)withdifferentheattreatmentshasbeencarriedout.Resultsshowthe
4、phononpeakofOTIClargegrainniobiumcanberecoveredbyheattreatmentatatemperatureofmorethan800℃,whichisdifferentfrompreviousmeasurementsatDESY.Inthispaperwepresenttheexperiments,resultsanddiscussionofthermalconductivityinvestigationofOTIClargegrainniobium.Keywords:largegrain
5、niobium;phononpeak;thermalconductivity;heattreatmentPACS:74.25.fcCLCnumber:TL503Documentcode:Adoi:10.11884/HPLPB201729.160530Niobium(Nb)isthemostcommonmaterialinsuperconductingRF(SRF)cavityfabricationduetoitsformabilityinmechanicalprocessingandappropriatesuperconducting
6、properties,suchaslowRFsurfacere-sistance,relativelyhighcriticaltemperatureandhighcriticalmagneticfield.Uptonow,mostofexistingSRFcavitiesaremadeoffinegrainniobiumwhichhasanaveragegrainsizeofseveraltensofmicrons.Recently,largegrainniobiumwithagrainsizeofseveralcentimeters
7、showsitspotentialadvantagesforSRFcavityfabrication.Largegrainniobiumhaslowerimpuritycontentthanfinegrainniobiumasaresultof[1]theeliminationoftherollingstepinmaterialproduction.Itisreportedthattheaverageintrinsicquality[2-4]factorQ0oflargegrainNbcavitiesat2Kisabout30%hig
8、herthanstandardfinegrainNbcavities.An-othersignificantpropertyoflargegrainniobiumisthehigherthermalconductivit
