同步辐射光源 By Vic Sullerppt课件.ppt

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1、SynchrotronRadiationSourcesPast,PresentandFutureByVicSullerContentsTheOriginsofSynchrotronRadiationSynchrotronRadiationCharacteristicsStorageRingsasSourcesInsertionDevicesTheFuturewith4thGenerationSourcesCrabNebula-thefirstSynchrotronsourceobserved??CAMDinBatonRouge,LACenterforAdvancedMicrostructur

2、esandDevicesAcceleratorSynchrotronRadiationDiscoveryofElectronJJThompsonOctober1897AcceleratedChargeRadiationLienardJuly1898FieldlinesfromastationarychargeFieldlinesfromanacceleratedchargeELECTROMAGNETICRADIATIONzyxSpatialdistributionofradiationfromachargeacceleratedalongthezaxisCoilSteelVacuumcham

3、berCrosssectionofaBetatronPrincipleofBetatronAccelerationAccelerationbyInduction-TheBetatronPredictionofEnergylossbyradiationinanacceleratorIwanenko&PomeranchukJune1944GEC(USA)electronaccelerators1946FirstattempttoDetectSynchrotronRadiationJohnBlewett1947–usedamicrowavereceiverexpectingHarmonicsoft

4、heorbitfrequency(100MHz)-nothingfound!FirstcorrecttheoryofSynchrotronRadiationJulianSchwinger1947–showedtheimportanceofrelativisticeffectsLightfromtheGESynchrotron1947Betatron-CERAMICSynchrotron-GLASSRelativisticeffectsinSynchrotronRadiationContractionoftheorbitintheelectronframeResult:-Orbitfreque

5、ncyincreasesbyfactorgRelativisticDopplershiftfromtheelectronframetothelabResult:-Frequencyfurtherincreasesbyfactor2gRelativisticforwardfocusingoftheemissionResult:-Frequencyfurtherincreasesbyfactor2pgfaccelerationElectronframeaccelerationqLabframevelocitybRelativisticfocusingofSynchrotronRadiationt

6、anq=g-1sinf(1+bcosf)-1Transformationbetweenframes:-Iff=900thenq=g-1RelativisticeffectsinSynchrotronRadiation(cont)Theeffectof3relativisticprocessesupshiftstheorbitfrequencyby~g3Forexample2GeVelectronsina100morbitorbitfrequency3MHzg=3914g3=6.01010100mÞ1.7nm(0.7keV)Forprotonstoradiateequivalentlyina1

7、00morbitEnergy=3.7TeVandmagneticfield=10kTSynchrotronRadiationFeaturesContinuumsourcefromIRtoX-raysSourceinacleanUHVenvironmentHighIntensityandBrightness4.HighlyPolarized5.Stable&controllablepulsedcharacter