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1、saturationtimeinoursimulationisconsistentwiththepredictionofthetheory．Fur-thernlore，wealsostudiedthepropagationoftwopulseswithinversephase-Inthiscase，thewakefieldexcitedbythefirstpulsewillbeabsorbedbythesecondpulsewhichshiRstohigherfrequency．Theoptimumintervalsbetweenthetwopulsesisabou
2、t1，7binoursimulationwhichismuchlongerthanthecommonlycitedvaluel。5≮-3。IntheSM-LWFAsimulation，weturnedourattentiontothewakefieldgenerationandelectronaccelerationdrivenbythe”self-modulatedinst魏1)ility”and”SideStimulatedR．amanScattering'’．Inordertotrapmoreelectrons，”TYiangle-shapepulseexci
3、tewakefieldschem礦wasproposed．Thepulsehasastowrisingwavefrontwhichstimulatesthe”Ramanscatteringinstability”toacceleratetheelectronsfirstlyandasharpfallingrearpartwhi矗exciteswakefieldtotrapelectronssecondly．Inthe”Gaussian-shapepulseezj￡citewakefieldsche№”simulation，thelaserpulseundergoes
4、”self-modulation'’and”self。focusing”andthePulsebreaksintoseveralsegmentswithintervalsaboutkalongthepropagatingdirection污thelaserpowerexceedsthecriticalpower．AwakeW；tvewillbeexcitedbythesesegmentsandacceleratetheelectronstohighenergy．0ursimulationalsoindicatedthatthe”SideStimulatedRaman
5、Scattering”canaffecttheprocessesofexcit蕺ionofwakefield，The”SideStimulatedRamanScatterin【礦excitestiletransverseplasmadensitydisturbancewhichcandimink&
6、htheportraitplasmadensitydisturbanceandhencereducetheamplitudeofthewakewave，0liewaywasproposedtominishthe”SideStimulatedRamanScatterin￡’
7、bynseofthetransverseDondermotiveforceofaverynarrowlaserpulsewhich㈣begeneratedby”self-f。cusing'’．Inaddition．weconfirmedthemaximumgrowthratemodeinthe”SideStimulatedRamanScattering'’isalwaystheonewithmaximumwavevectoroftheelectrostaticwave．4。Ⅵ電alsostudiedtheinfiuenceofthelaserpulsewithfin
8、iretransversewidth。ThelaserpulsewithwidthmuchlargerthankandpowerPmuchgreaterthanthecriticalpower只undergoes”self-focusing"whichexciteselectron”vorticesinstability”andle砸toabnorm砒absorption。Inoursimulation，over60％la囂erenergytranslatetothekineticenergyoftheelectronswhenP>8心．Theextremena
