激光尾流场加速电子机理的粒子模拟研究

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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矿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【矿excitestiletransverseplasmadensitydisturbancewhichcandimink&

6、htheportraitplasmadensitydisturbanceandhencereducetheamplitudeofthewakewave，0liewaywasproposedtominishthe”SideStimulatedRamanScatterin￡’

7、bynseofthetransverseDondermotiveforceofaverynarrowlaserpulsewhich㈣begeneratedby”self-f。cusing'’．Inaddition．weconfirmedthemaximumgrowthratemodeinthe”SideStimulatedRamanScattering'’isalwaystheonewithmaximumwavevectoroftheelectrostaticwave．4。Ⅵ电alsostudiedtheinfiuenceofthelaserpulsewithfin

8、iretransversewidth。ThelaserpulsewithwidthmuchlargerthankandpowerPmuchgreaterthanthecriticalpower只undergoes”self-focusing"whichexciteselectron”vorticesinstability”andle砸toabnorm砒absorption。Inoursimulation，over60％la嚣erenergytranslatetothekineticenergyoftheelectronswhenP>8心．Theextremena