x-ray micro-densitometry of amorphous morub for ligo flex 对ligo flex的无定形morub x射线微密度

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1、22X-RayMicro-densitometryofAmorphousMoRuBforLIGOFlex-JointMirrorSuspensionsEricAdamKortMentor:Dr.RiccardoDeSalvoAbstractSuspensionthermalnoisehasbecomealimitationintheresolutionoftheAdvancedLIGOinterferometer,hinderingourabilitytodetectgravitywavesatlowfrequency.Thep

2、resentbaselinesolution,fusedsilicafibers,hasmanyinherentproblemsthataredifficulttoovercome.Oxidationpresentsthemostsignificantproblem,asitweakensthefiberandlowersthequalityfactor,severelylimitingthetheoreticaladvantagesofusingfusedsilicaassuspensionmaterial.Theseprob

3、lemsweretheincentiveforresearchingamorphousmetalsasanalternativematerialformirrorsuspensions.AmorphousMoRuBsamplesarecurrentlybeingmanufacturedandtestedforuseasflexjointsformirrorsuspensions.Severalmaterialpropertiesandsamplecharacteristicshavetobemeasured,inparticul

4、ar,itisnecessarytocertifyeachflexjointuniform,compact,andfreefromcracksbothbeforeandaftermanufacturing.Certifyingthateachjointisfreefromcracksdowntoalevelsubstantiallysmallerthanthematerial’scatastrophicfailurecriticaldefectsize(~100mmforMoRuB)isequivalenttocertifyin

5、gthatthesamplewillnotcrackunlessitisexposedtostressesexceedingthematerialultimateyieldstrength.Goodjointcertificationallowsustofullyusethematerial’sstrength.ThiscertificationismadethroughX-rayimagingofthesamples(inourcaseweusedadiagnosticmedicalX-rayunitcourtesyofthe

6、AnimalCarefacilityatCaltech),digitizingtheimagesusingascanner(inourcaseaslidescannercourtesyofCaltech’sDigitalMediaCenter),andthenanalyzingtheresults.Wedevelopedaprocessthatcertifiesasampleasbeinguniform(samethicknessthroughoutandfreeofanyholes/cracks)andthereforesui

7、tableforuseasaflex-jointsuspension.Thiscertificationprocessisalsoappliedtoallsamplesusedtomeasurethematerial’sproperties.1.IntroductionThepurposeofLIGO(LaserInterferometerGravitational-waveObservatory)istodetectgravitywaves.GravitywavesarepredictedthroughEinstein’sth

8、eoryofGeneralRelativity.Inthistheory,thewarpingofspace-timedescribesgravity.Whenamassiveobjectisquicklyaccelerated,itcausesaripplei