›› 2017, Vol. 37 ›› Issue (5): 24-.doi: 10.16708/j.cnki.1000-758X.2017.0080

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Elementarystudyonthedischargeprocessandperformanceofmicropulsedplasmathruster

 WANG  Shang-Min, TIAN  Li-Cheng, ZHANG  Jia-Liang, ZHANG  Tian-Ping, FENG  Wei-Wei, CHEN  Xin-Wei, GAO  Jun   

  1. 1.ScienceandTechnologyonVacuumTechnologyandPhysicsLaboratory,LanzhouinstituteofPhysics,Lanzhou730000,China
    2.KeyLaboratoryofMaterialsModificationbyLaser,IonandElectronBeamsofMinistryofEducation,DalianUniversityofTechnology,Dalian116024,China
  • Received:2017-05-04 Revised:2017-08-09 Online:2017-10-25 Published:2017-09-12

Abstract: Thedischargeprocess〖JP+2〗andperformancecharacterizationofaplanarablationmicropulsedplasmathruster(〖WT〗μ〖WTF2〗PPT) 〖HJ5.5p〗 wereinvestigated.Basedontheelectricalmeasurementsofthedischargeprocessandopticalbehavioroftheplasmaregion,thebasicdischargecharacteristicsandtheevolutionofthedischargepatternofμPPTwerestudied.Fromthespatialpattern,μPPTdischargegapcanbedividedintothreeregions(cathoderegion,arccolumnregionandanoderegion);withthedischargegapdecreasing,theanodeareagraduallydisappears.Fromthetemporalbehavior,μPPTiscomposedofseveralpulsedischargeswithdifferentamplitude.Thenumberofdischargepulsesisdeterminedbytheimpedancedetailofthedischargecircuitanddischargegap.Singlepulsedischargecanoccurundersuitableconditions.BasedonthecurrentsheetmodeloftheμPPTplasmaregion,thebasicperformanceparameterssuchasimpulsebitandspecificimpulseofμPPTwereestimated.TheresultsshowthatthedischargegapandablationvolumehaveanimportanteffectontheμPPTperformanceparameters.Withsamedischargeenergypulse,thelargerthegapis,thelargertheimpulsebitis,leadingtolargerablationamountandsmallerspecificimpulse.DischargetimespacemorphologyisthekeyfactorthataffectstheimpulsebitandspecificimpulseofμPPT.Therefore,itisaneffectivewaytoimprovetheμPPTperformancebystudyingtheoptimizationofdischargecircuitanddischargegapimpedance.

Key words: micropulsedplasmathruster, electricalcharacteristics, opticalproperties, performanceprediction, microelectricpropulsion