2009_NRL_Intense Sheet Electron Beam Transport in a

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1、744IEEETRANSACTIONSONELECTRONDEVICES,VOL.56,NO.5,MAY2009IntenseSheetElectronBeamTransportinaUniformSolenoidalMagneticFieldKhanhT.Nguyen,Member,IEEE,JohnA.Pasour,SeniorMember,IEEE,ThomasM.Antonsen,Jr.,SeniorMember,IEEE,PaulB.Larsen,JohnJ.Petillo,Member,IEEE,andBaruchLevush,Fellow,IEEEAbstractInthisp

2、aper,thetransportofintensesheetelec-Here,weconsidertheuseofsolenoidalmagneticfocusingtronbeamsinauniformsolenoidalmagneticfieldinhigh-powertoachievestabletransportofhigh-current-densitysheetbeamsvacuumelectronicdevicesistheoreticallyexaminedwiththe3-DthataresuitableforpoweringMMWamplifiers.Theadvanta

3、gebeamopticscodeMICHELLE.Itisshownthatasolenoidalofsolenoidalfocusingovertheperiodicpermanentmagnetmagneticfieldcanbeaneffectivetransportmechanismforsheetelectronbeams,providedthebeamtunnelismatchedtothebeam(PPM)configurationsisthatasubstantiallyhigherfield(and,shape,andviceversa.Theadvantageofsolenoi

4、dalmagneticfieldhence,strongerfocusing)canbeachieved.Thus,highercurrenttransportrelativetoperiodicmagnetictransportresidesinthedensitiescanbetransportedatlowerbeamvoltages,leadingfeasibilityoftransportinghighercurrentdensitybeamsduetothedirectlytoashorterinteractionlength,higherpower,andhigherhigher

5、averagefieldstrengthachievableinpracticeandthelowerefficiencyforagivenvoltage.Thisprovidesthekeyimpetussusceptibilitytofielderrorsfrommechanicalmisalignments.Inaddition,asolenoidallytransportedelectronbeamisnotsuscep-fortheworkpresentedinthispaper,inwhichthefeasibilitytibletovoltagecutoffasinaperiodic

6、magneticfocusingsystem;ofsolenoidalmagnetictransportofsheetelectronbeamsishence,deviceefficiencyispotentiallyhigher.reexaminedanddemonstratedviatheuseoftheself-consistentIndexTermsAmplifier,beamtransport,Brillouinflow,dio-3-DbeamopticscodeMICHELLE[1].cotroninstability,E×Bdrift,periodicpermanentmagne

7、tTheuseofsolenoidalmagneticfocusingforsheetbeamshas(PPM),sheetbeam,solenoidalmagneticfield.usuallybeenruledoutinfavorofPPMfocusingbecauseofE×Brelatedeffects.OfparticularconcernistheE×BI.INTRODUCTIONguidi