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ID:55621659
大小:14.41 MB
页数:51页
时间:2020-05-20
《G8-自由电子激光原理_黄志戎.ppt》由会员上传分享,免费在线阅读,更多相关内容在PPT专区-天天文库。
1、FELprinciple黄志戎(ZhirongHuang)自由电子激光原理1DtheoryLectureOutlineSASEandXFELFELR&D“Asolutionlookingforaproblem."3LightBulbvs.LaserA.Schawlow(Nobelprizeonlaserspectroscopy),ScientificAmericans,1968Radiationemittedfromlightbulbischaotic.Pinholecanbeusedtoobtainspati
2、alcoherence.Monochromatorcanbeusedtoobtaintemporalcoherence.PinholeandMonochromatorcanbecombinedforcoherence.Laserlightisspatiallyandtemporallycoherent.ProducedbyresonantinteractionofarelativisticelectronbeamwithEMradiationinanundulatorFreeElectronLaser(FEL)
3、electronbeamphotonbeame-beamdumpundulatorTunable,Powerful,CoherentradiationsourcesJohnMadey—InventoroftheFEL(1971)ThreeFELmodesFELoscillators(High-averagepower)SinglepassFELs(SASEorseeded)(SR)BrightlightsourcesfromrelativisticelectronsElectronsemitwithrandom
4、phaseradiationintensityN(gisLorentzfactor,Nisnumberofelectrons~109)SynchrotronradiationUndulatorradiationLinacCoherentLightSource(LCLS)atSLACInjectorExisting1/3Linac(1km)(withmodifications)NearExperimentHallFarExperimentHallUndulator(130m)X-FELbasedonlast1
5、-kmofexisting3-kmlinacNewe-TransferLine(340m)1.5-15Å(14-4.3GeV)X-rayTransportLine(200m)ProposedbyC.Pellegriniin1992EraofXFEL(2009)XFELsareExtremelyBrightandUltrafasttimeXFEL1012photonsSynchrotron106photons100fs10psNote:synchrotronsourcesaremuchhigherrep.rate
6、thanXFELsOrderedStructuresEquilibriumPhenomenaDisorderedStructuresNonequilibriumPhenomenaTransientStates19002000futureEraofCrystallineMatterEraofDisorderedMatterCoherentX-rayProbesConventionalX-rayProbesFutureRoleofFELsandAdvancedSourcesH.Dosch(DESY)Undulato
7、rradiationWorksforharmonicslh=l1/hUVSOR,Okazaki,Japanluforwarddirectionradiation(andharmonics)undulatorparameterK=0.94B[Tesla]lu[cm]Canenergybeexchangedbetweenelectronsandco-propagatingradiationpulse?l1LCLSundulatorK=3.5,lu=3cm,e-beamenergyfrom3GeVto15GeVtoc
8、over1=30Åto1.2ÅElectronandPhotonInteractionResonantinteractionenergy=(-0)/0phase=(k1+ku)z-1tradiationwavenumberundulatorwavenumberUsevariablesarrivaltimeatundulatordistanceFELlongitudinal
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