等离子体填充喇曼型FEL放大器特性研究

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1、电子科技大学硕士学位论文等离子体填充喇曼型FEL放大器特性研究姓名：钟辉申请学位级别：硕士专业：光学指导教师：杨梓强20040201ABSTRACTFreeelectronlaser(FEL)hasavastprospectiveinmanyfields．Manyscienceandresearchinstituteshomeandabroadhavelayinvestigationonitandgotsomeimportantachievements．Atpresent，researchershavefocusedonthoseFELwithbroadwidth，smallsize，lowc

2、ostandhighevenpower．AmongthemsizehasbecomethekeyfactorofrestrictingthedevelopmentofFEL．Plasmafilledhigh-powermicrowaveapparatusCallimproveitscharacteristics，whichhasbeendemonstratedinsomeexperiments．WiththehelpofMAGICprogram，anewcoaxialhybridwigglerFELamplifierwasinvestigatedinthispaper．Accordingtot

3、hecharacteristicofthewigglermagneticfieldinthisamplifier,propermagneticfieldinputmethodischosenintheprocessofPICsimulatedresearch．Itanalyzesthebandwidth，gainandsaturationdistance，etc．andstudieshowgainsincreasewhenparametersvarygraduallyinthisFEL．TheresultsofPICsimulationresearchareagreementwiththeth

4、eoreticalresults．WiththehelpofMAGICprogram，thispaperstudiesthecharacteristicsofcoaxialhybridwigglerFELthroughparticlesimulation，andanalysestheinfluenceofplasmafillingonitsbandwidth，saturationdistanceandgainetc，Thesimulationexperimentshowsthatthereexistsacriticalplasmadensity,andifthedensityexceedscr

5、iticalone，light—wavecannotinteractwithelectronsynchronically．ThePICsimulatedresearchshowsthattheresulttallieswiththetheoreticalresult．ThroughthePICsimulationandtheoreticalresearchoncoaxialwaveguideFELandtheeffectofplasmafilling0i"1theapparatus，someachievementsintheoryandapplicationhavebeenobtained．1

6、)．StudiescoaxialhybridwigglerFELthroughPICsimulation，analysesitsgain，bandwidth，efficiency,etc，andstudiestheinfluenceonoutputwhenparameterschangegradually．2)StudiesthecharacteristicsofcoaxialhybridwigglerFELwhenfilledwithplasmathi'oughparticlesimulation．Theresultshowsthatthoughpowerdoesn’tincreaseevi

7、dently,thebandwidthincreaseswhenfilledwithplasmaandithelpstoreducesaturationdistanceinaproperdensity．TheoryandPICsimulationshowthatthereexistsacriticalplasmadensitNandifthedensityexceedscriticalone，li