带状注电子枪的聚焦设计

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1、Abs仃actAbstractThegenerationandstabletransportofelectronicsheetbeamscomeswithinthescopeofmanysubjects，suchaSmicrowaveelectronics，plasmaelectronics，ElectromagneticFieldsandMicrowaveTechniques，vacuumtechnique，materialsscience，whichisacomplexfundamentalutilityresearc

2、hproblem．Intensiveandpainstakingstudyoftheseproblemscannotonlypromoteourfundamentalresearchlevelinvacuumelectronicsfieldandimproveourindependentinnovationability,whichhasimportantsciencemeaning,butprovideselectronicsourcesgreatlywantedinmillimeterwaveelectricvacBu

3、mdevicesandaccelerators，thusbreakwesterncountries’blockadeonnewtechniques，meettheurgentneedofOUrcountry’Smartialandcivilelectronicsystems，whichhasgreatpracticalsignificance．Sheetelectronbeamhavelotsofattractivevirtues．Forexample，whenitwasusedinmicrowavetubes，itCan

4、carryhighercurrentsthanthosewithsolidbeams．Sincesheetbeamcurrentwouldnotbelimitedinperveance,whichmeanscurrentisincreasedbyincreasingthewidthofthebeam．Ontheotherhand，Sheetelectronbeamcouldgreatlydecreasethespacechargeforcethatmightreducethefocusingrequirement．Conv

5、ertingfromcylindricalsolidtosheetbeammaypermitsubstantialreductioninspacechargeeffectsontheefficiencyofdevices．Themorehi曲frequencyweneedsmalleroftheSWS(slowwavestructure)section．Wecanusesheetelectronbeaminmicrometerormicrowavedevice，whileringorcylindricalelectronb

6、eamCall’tbeusedinsuchdevice．Finally,sheetelectronbeamcouldputclosetoSWS，whichmakesthetubesmoreefficientlythanringorcylindricalelectronbeamtubes．Atpresent，therearetwomainwaystoproduceanelectronicsheetbeam，(i)directapproach：thesheetbeamisproduceddirectlybythesheetbe

7、amgun，whichisdividedintorectanglesheetbeamgunandellipticalsheetbeamgun．蓬)indirectapproach：thesheetbeamisproducedbycircularbeamflyingthroughtheasymmetricsolenoidlenses，andproducedsheetbeambyquadrodefocused．Thisarticlemainlydescribesthetheoryresearchandparticlemodel

8、ingofthesecondway．IIIAbstractFirstinthisarticle．thepotentialdistributionexpressionofinfiniteplanardiodeisdeduced，basedonthetheoryofPiercegun．Secondly，th