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1、43rdAIAA/ASME/SAE/ASEEJointPropulsionConference&ExhibitAIAA2007-53068-11July2007,Cincinnati,OHNumberDensityDistributionsofXenonAtominHallThrusterPlumes*†‡§**MakotoMatsui,ShigeruYokota,DaichiSako,KimiyaKomurasaki,YoshihiroArakawaTheUniversityofTokyo,Tokyo,113-86
2、56,JAPANLaserabsorptionspectroscopywasappliedtoamagneticlayertypehallthrusterplumeinthedifferentambientpressureconditions.Aninfluenceoftheambientpressureonthenumberdensitymeasurementwasevaluated.Asaresult,themeasurednumberdensitywasfoundtocontainthebackgroundxe
3、non.Then,thenumberdensitydistributionofthepropellantxenonwasestimatedseparatelyfromthebackgroundone.Nomenclature-1A=Einsteincoefficient,sg=statisticalweighth=Planck’sconstant,J.s2I=probelaserintensity,mW/mm2I0=incidentlaserintensity,mW/mm-1k=absorptioncoefficie
4、nt,mkBB=Boltzmannconstant,J/K-1K=integratedabsorptioncoefficient,GHzm-3n=numberdensity,mr=radialcoordinate,mmR=plumeradius,mmT=translationaltemperature,KTe=electrontemperature,eVx=coordinateinthelaserpassdirection,mmy=probebeamposition,mmz=axialcoordinate,mmΔE=
5、energygap,eVλ=wavelength,nmν=laserfrequency,Hzν0=centerabsorptionfrequency,HzSubscripti=absorptionstatej=excitedstatetot=totalstatesI.IntroductionallthrustersareoneofthepromisingthrustersofsatellitesfororbittransferorNorth/SouthstationkeepingHmissionsbecauseitp
6、roduceshighthrustefficiency,exceeding50%,withaspecificimpulserangeof1000-3000sandahigherionbeamdensitythanionthrustersbecauseoftheexistenceofelectronsintheionacceleration*JSPSResearchFellow,DepartmentofAeronauticsandAstronautics,matsui@al.t.u-tokyo.ac.jp.Member
7、AIAA.†Graduatestudent,DepartmentofAeronauticsandAstronautics,StudentMemberAIAA.‡Graduatestudent,DepartmentofAeronauticsandAstronautics.§AssociateProfessor,DepartmentofAdvancedEnergy,MemberAIAA.**Professor,DepartmentofAeronauticsandAstronautics,MemberAIAA.1Ameri
8、canInstituteofAeronauticsandAstronauticsCopyright©2007bytheauthor(s).PublishedbytheAmericanInstituteofAeronauticsandAstronautics,Inc.,withpermission.zone.Thisisbecauseamoder
