超短超强激光与固体靶相互作用中超热电子的角分布

165Vol.16,No.520045HIGHPOWERLASERANDPARTICLEBEAMSMay,2004:100124322(2004)0520587206X1,2,3,2,2,1,1,2,1,2,2,2,2,2,2,2,2,2(1.,610065;2.,621900;3.,641112):3TWLiF:;;,,,,:;;;;:O434.12:A(CPA)[1](US2UI),[2,3]p30m(10fs)3mm(10ps),1017Wcm-21021Wcm-2[4],,22,(RA)[5](VH)Brunel[6,7]JB[8,9][10,11][12],P,;JB[12],2,X,2,G.Malka[8]M.Tatarakis[13]MeV;R.Kodama[14]S.Bastiani[15]Y.Sentoku[16]:S,MeV;P,L.M.Chen[17]:S,;P,,M.I.K.Santala[12]K.Krushelnick[18]8X:2003207211;:2003212204:;(10275057):(1963),,,,;E2mail:[e-mail](1941),,,,(1943),,,,©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1Fig.1Schemeoftheexperimentalsetup13TW,:300mJ(),800nm,60fs,10Hz,2%110-6(2ns)1,8,f/10125mJ(),40mm20mCu100mAl45,P2,,,;,XXCCD,225m(FWHM),4.01017Wcm-2Fig.2Imageofthefocusoftheincidencelaser2LiF(Mg,Cu,P)(TLD)[19]16cm;LiFTLD3.2mm3.2mm0.38mm,137CsLiFTLD[20],LiFTLD45,LiFTLDA.Maksimchuk(MeV)[21]i,maxZIR(1):Z,I,1018Wcm-2;,=10%[21];R;,Rm,0.63MeV,50100m,,50m2125MeV80keV,100m3MeV120keV2LiFTLD,XLiFTLD,,X,2MeV[22]LiFTLD5mm(2120MeV)X88516©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Fig.3AngulardistributionoftheX2rayonincidenceplanewithanincidenceangleof453X345X(20),XLiFTLD910-5Gy420mCu(20,50mAl,80keV):;(0),,,,;,20,LiFTLD(710-2Gy),45(1.21.410-2Gy),60(310-3Gy);LiFTLDXFig.4Angulardistributionsofhotelectronsonincidenceplanewithdifferentanglesofincidence4545100mAl(20,100mAl,120keV):(90),20(FWHM);60,10(FWHM),LiFTLD0.3510-2Gy3(1)X,XLiFTLDLiFTLD,X45,X(2)3,4(c)5:X;80keV,X;120keV,[23]9855:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Fig.5Angulardistributionofhotelectronswithover120keVonincidenceplane.5120keV,:2,X,[24](X),80keV,X(3)4,(0),,,L=n/(5n/5x)XoscAlexeiZhidkov[25],,L=(12)(),Xosc=eE0/me200.07(2):E0=2I/0c,;e;me;0=2c/LXosc,LmXosc[26],L=(12),L=(1530)Xosc,,20LiFTLD,20K.G.Estabrook[27],20(4)LiFTLDX,LiFTLD50m,,,20mCu,,(5)5LiFTLD100m,,(60)H.Ruhl[28],,tan=1+I2-1I2tan(3):();();I2,Wcm-2m2;-18.01017Wcm-2m2,2=2.561017Wcm-2m2(3)14,59,(90)Y.Sentoku[16],sin=-1sin(4)=40(85),(4)=11,5.6MeV,[22][29],2MeV[30][31]Y.Sentoku[16],:,;,,09516©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.I2=2.561017Wcm-2m21018Wcm-2m2,VB,,(),(vosc/c)22/k0L(5):vosc=eE0/me0,;k0(vosc/c)20.19;2/k0L=0.16(6)ls10nm[26],p=(4n0e2/me)1/2=5.65104n0n0nccm-3=1.11021(/m)2(7):,p=2.341015s-1,lsc/p128nm,:,43TW,2:,;,,,,:[1]PerryMD,MourouG.Terawatttopetawattsubpicosecondlasers[J].Science,1994,264:917.[2]GibbonP,FjrsterE.Short2pulselaser2plasmainteractions[J].PlasmaPhysicsandControlledFusion,1996,38:769.[3]GauthierJC.Inlaserinteractionwithmatter[A].InstituteofPhysicsandPhysicalSociety[C].Bristol,1994,140:1.[4]WilksSC,KruerWL.Absorptionofultrashort,ultra2intenselaserlightbysolidsandoverdenseplasmas[J].IEEEJQuantumElectron,1997,33:1954.[5]ForslundDW,KindelJM,LeeK,etal.Theoryandsimulationofresonantabsorptioninahotplasma[J].PhysRevA,1975,11:679.[6]BrunelF.Not2so2resonant,resonantabsorption[J].PhysRevLett,1987,59:52.[7]BrunelF.Anomalousabsorptionofhighintensitysubpicosecondlaserpulses[J].PhysFluids,1988,31:2714.[8]MalkaG,FuchsJ,AmiranoffF,etal.Suprathermalelectrongenerationandchannelformationbyanultrarelativisticlaserpulseinanunderdensepreformedplasma[J].PhysRevLett,1997,79:2053.[9]LiuSB,ZhangJ,WeiY.Accelerationanddouble2peakspectrumofhotelectronsinrelativisticlaserplasmas[J].PhysRevE,1999,60:3279.[10]SprangleP,EsareyE,TingA,etal.Laserwakefieldaccelerationandrelativisticopticalguiding[J].ApplPhysLett,1988,53:2146.[11]AmiranoffF,BatonS,BernardD,etal.Observationoflaserwakefieldaccelerationofelectrons[J].PhysRevLett,1998,81:995.[12]SantalaMIK,ZepfM,WattsI,etal.Effectoftheplasmadensityscalelengthonthedirectionoffastelectronsinrelativisticlaser2solidinterac2tions[J].PhysRevLett,2000,84:1459.[13]TatarakisM,DaviesJR,LeeP,etal.Plasmaformationonthefrontandrearofplastictargetsduetohigh2intensitylaser2generatedfastelectrons[J].PhysRevLett,1998,81:999.[14]KodamaR,TanakaKA,SentokuY,etal.Long2scalejetformationwithspecularlyreflectedlightinultraintenselaser2plasmainteractions[J].PhysRevLett,2000,84:674.[15]BastianiS,RousseA,GeindreJP,etal.Experimentalstudyoftheinteractionofsubpicosecondlaserpulseswithsolidtargetsofvaryinginitialscalelengths[J].PhysRevE,1997,56:7179.[16]SentokuY,RuhlH,MimaK,etal.Plasmajetformationandmagnetic2fieldgenerationintheintenselaserplasmaunderobliqueincidence[J].1955:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.PhysPlasmas,1999,6:2855.[17]ChenLM,ZhangJ,LiYT,etal.Effectsoflaserpolarizationonjetemissionoffastelectronsinfemtosecond2laserplasmas[J].PhysRevLett,2001,87:22500121.[18]KrushelnickK,ClarkEL,ZepfM,etal.Energeticprotonproductionfromrelativisticlaserinteractionwithhighdensityplasmas[J].PhysPlas2mas,2000,7:2055.[19]BilskiP,BudzanowskiM,OlkoP,etal.Propertiesofdifferentthin2layerLiF:Mg,Cu,PTLdetectorsforbetadosimetry[J].RadiatProtDosim,1996,66(124):101.[20],,,.LiF[J].,2003,15(2):141.(CaiDF,GuYQ,ZhengZJ,etal.CalibrationofLiFthermoluminescencedosimetersusedtomeasuretheelectronenergyspectrum[J].HighPowerLaserandPar2ticleBeams,2003,