二次電子發(fā)射對(duì)SPT壁面鞘層的影響.pdf

1、大連理工大學(xué)碩士學(xué)位論文二次電子發(fā)射對(duì)SPT壁面鞘層的影響姓名：趙曉云申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：等離子體物理指導(dǎo)教師：劉金遠(yuǎn)20070622二次電子發(fā)射對(duì)SPT壁面鞘層的影響EffectsofSecondaryElectronEmissionontheSheathofSPTNeartheWallAbstractInrecentyears，謝tllthedevelopmentofourcountryaerospaceandtheglobet

2、heannualrequirementofsatelliteisincreasingsharplyAndtheinstituteofscientificresearchinthewordfocusedalltheirattentiononelectricpropulsionStationaryplasmathrusterisarepresentativeelectricpropellerTheSPTisthemostnatureandm

3、ostwidelyusedelectricalpropulsiondevice，anditismainlyusedforstationkeepingandattitudecontr01Thcteamsofresearchallovertheworlddomuchresearchinordertoimproveandoptimize也eperformancesofSPTThestationaryplasmathrusterpresents

4、longchambersandceramicwallsSheathwhichisshapedbetweenthechannelwallandplasmaisbasicphysicalprobleminSPTBecausesheathmakesimportantinfluencesonheatfluxesdepositedattheWalI，nearwallconductivitywallerosion，plasmastateinside

5、thechannelandSOonSheathbecomes血efoCUSandpopulationofresearchcurrentlyManysecondaryelectronsemittedfromthewallswhenelectronswimhj出energybombardt11eceramicWallsSecondaryelectronshavegreatlyeffectonSPTInordertoanalyzetheshe

6、athneartheceramicWallofSPTandtheeffectsonthrusterperfornmncesaonedimensionalfluidmodeofthesheathinthepresenceofsecondaryelectronemissioniSformulatedwiththeassumptionthattheeffectofthemagneticfieldonthechargeparticlesCall

7、beneglectedandtheplasmaiScollisionlessItiSdiscussed也atSEEnotonlyaffectspotential，electricfieldanddensityofchargeparticlesinthesheath，butalsohaseffectsonenergyfluxdepositedattheceramicwallandelectrontemperatureEnhancement

8、ofSEEcoefficientdecreasesionenergyfluxandincreaseselectronenergyfluxandtotalenergyfluxofchargeparticlesdepositedattlleceramicwallThesehaveimportmltconnectionswiththeperformanceandlitLtimeofSPTComparingbetweenthewidthofch

9、annelandthethicknessofsheath，secondaryelectronemittedfromthewallwilltransitthesheathandteachtheoppositesheathTheeffectsonSPTdependmainlyOntheproductofsecondaryelectronemissioncoe伍cientandtrappedcoefficientInordertaisethe

10、extractedcurrentdensityofionsnegativeionsareinjectedintheSPTfromthecathodeIntheaxialelectricfieldnegativeionsareacceleratedandanterthechannelNegativeionsnotonlyrestrictsecondaryelectronemittedfromtheceramicwallbutalSOaff