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Outline•  Measuringcrystallographicchangesusinghighenergysynchrotron

X-raydiffrac8on(XRD)o  SimultaneousmeasurementoflaUcedistor8ons,cri8calcurrent,stress,strainofHTSat77K

o  SimultaneousmeasurementofNb3SnlaUcedistor8ons,stress,strainat4.2K

•  LaUcedistor8onsandelectromechanicalproper8eso Bi-2223o Bi-2212o MgB2o Nb3Sn

•  CanXRDmeasurementshelptoexplainwhyJcofNb3Snwiresismoresensi8vetotransversethantoaxialstress?

2C.Scheuerlein,MEM2016,23March2016

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Why measure simultaneously lattice distortions, critical current, stress and strain?

•  AcomparisonoflaUcedistor8onswithsuperconduc8ngproper8esmeasuredwithdifferentexperimentsmaybehamperedbyseveraluncertain8es:

–  Influenceofsampleholdermaterialandsolderonthestressstateinthesuperconductor

–  Samplegeometry–  Sampleinhomogeneity–  Previoussamplemanipula8on–  Thermalhistoryofthesample–  Strainmeasurementuncertain8es

•  Theseuncertain8escanbeeliminatedorreducedwhenmeasuringelectromechanicalproper8esandlaUcedistor8onsatthesame8me.

•  Suchmeasurementscanmostconvenientlybeperformedwithhightemperaturesuperconductors(HTS)inanopenliquidnitrogencryostat,andwithoutappliedfield.


Set-upsforsimultaneousmeasurementoflaUceparametersand(a)Ic,stressandstrainat77K,and(b)stressandstrainat4.2KintheESRFID15beamline

6

4.2Kset-upfromUniGenevaRTand77Kset-up

C.Scheuerlein,MEM2016,23March2016

7

Superconductorinstrumenta8onandX-raytransparentcryostat

•  Dismountablecryostatmadeofstainlesssteel,encapsulatedbyStyrofoam.WindowsaremadeofsheetsofPET,inwhichX-rayabsorp8onisnegligible.

•  Absor8onof90keVX-raysin7cmofliquidnitrogenisabout50%.

Bi-2212wirewithvoltagetaps,extensometerandcurrentleads.

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Conclusion•  SeveralintenseBi-2212,Bi-2223,Nb3Sndiffrac8onpeaks,whichcanbefijedin

ordertodetermineaccuratelaUceparameterchanges,canbeacquiredbyXRDintransmissiongeometry.Theacquisi8onofMgB2diffrac8onpeaksinPITwireswithsufficientsignal-to-noiseismorechallenging.

•  Thetemperatureinfluenceonthemechanicalbehaviouroftheindividualwirecons8tuents,fractureofbrijlecomponentsandloadtransferarerevealedbytheXRDelas8cstrainmeasurements.

•  Textureispresentinmostwirecons8tuents.Nb3SntexturemayhaveaninfluenceontheJcsensi8vityofRRPandPITtypewires,butitcannotexplainthedifferentJcresponsetoaxialandtransversestressinBRwires,wheretheNb3Sngrainshavearandomorienta8on.

•  Transversewirecompressionpresumablycausesaninhomogeneousstressandstraindistribu8onintheNb3Snfilaments.Diffrac8onpeakwidthchangesduringapplica8onoftransversecompressivestressat4.2Kcouldbeanindica8onofinhomogeneousstressdistribu8on.


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