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1、44thAIAA/ASME/SAE/ASEEJointPropulsionConference&ExhibitAIAA2008-520621-23July2008,Hartford,CTSpatiallyMappingtheIonEnergyDistributionsinHollowCathodeDischargesJoHannaN.PrzybylowskiGALCIT,CaliforniaInstituteofTechnology,Pasadena,CA,91125JamesE.PolkyJetPropulsionLaboratory,CaliforniaIn
2、stituteofTechnology,Pasadena,CA,91109JosephE.ShepherdzGALCIT,CaliforniaInstituteofTechnology,Pasadena,CA,91125Distributionsofionenergy-per-chargewerecollectedwithanelectrostaticenergyana-lyzerdirectedalongvariouslines-of-sightinthenear-plumeregionofahollowcathodeop-eratinginalaborator
3、ydischargechamber.Whiletheanalyzerwasstationary,thecathodeandanodeassemblyweremountedonarotaryandalinearstage,allowingmeasurementsalongthecathodeaxisandato -axisanglesupto90;thelinearstageenabledtrans-lationalmotionwhichallowedformeasurementsparalleltothecathodeaxis.Atanglesbelow45,
4、threedistinctionpopulationswereidenti ed:twolow-energynarrowpeaksandabroadhigh-energytail"withenergies-per-chargeinexcessof5timesthedischargevoltage.Detectionoflow-energyionsabove45wasnotpossiblesincetheywerecon nedbytheanodevoltage.Atlargeangles,theintensityofthehigh-energyionsigna
5、ldecreasedtobecomeindistinguishablefromnoiseinthedatasystem;however,basedonpreviousresults,thefailuretodetecthigh-energyionsatlargeangleshasbeenattributedtothelargedistancebetweenthecathodeandESA,notalackofhigh-energyions.AstheanglebetweentheESAline-of-sightandthecathodeaxisincrease
6、sfrom0to16,thelocationofthelow-energyionpeaksshiftbutthereisnoapparentdi erenceinthehigh-energyiontail.Increasingtheseparationanglefurtheryieldsadecreaseinintensityatallener-gies.Forlowenergies-per-charge,theshapeandintensityoftheunidirectionalion-energydistributiondoesnotchangewhenth
7、ecathodeistranslatedupto2.5cm;however,asthedistancefromthecathodecenterlineincreases,thesignalintensityofthehigh-energyionsdecreasesinamannersimilartothedecreaseinhigh-energyionsseenwithincreasingan-glesabove30.Theseresultsindicatethatmagneto-gasdynamicforcesdidnotacceleratetheionsob
8、serve
