LOW-FREQUENCY WAVES, STABILIZATION, AND ENHANCED TRANSPORT IN THE PLASMA SURROUNDING A HOLLOW CATHODE DISCHARGE

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1、NOtICEThisreportwiipreparedasanaccountofworksponsotedbytheUnitedStatesGovernment,NeithertheUnitedStateanortheUnitedStatesAtomicEnergyComrnissiQn,noranyoftheiremployees,noranyof-ii-theircontractors,subcontractors,ortheiremployees,makesanywarrantyiexpressor'implied,orassumesa

2、nylegalliability-orresponsibilityfortheaccuracy,completenessorusefulnessofanyInformation,apparatus,productorprocessdisclosed,orrepresentsthatitsusewouldnotinfringeprivatelyownedrights.ContentsAbstractviI.Introduction1II.PreviousWorkontheHCD7A.UnderstandingTransport7B.WaveSt

3、abilization111.LinearFeedback122.NonlinearFeedback153.DynamicStabilization16h.FeedbackasaDiagnosticTool165-OtherInterestingExperiments:Stabilization176.ThePresentExperiment18III.ExperimentalArrangement20A.TheHollow-CathodeDischarge20B.LangmuirProbeConfiguration25C.Direction

4、alLangmuirProbe(DLP)Construction26D.LinearFeedbackCircuitry31E.ACStabilizationSwitchingCircuit33IV.SurveyofLow-FrequencyInstabilities35A.Introduction35B.'ClassificationofInstabilities351.MED352.Drift373-Micro-Instabilities38BiSffliBBTiDHOFTBS39SUKSMTB8HUS3TSD/-iii-C.Experim

5、entalEvidenceforWaveIdentificatiD.DiscussionofPossibleWaves1.MHD<;.DriftWaves3.SusmaryTheoryA.RotationalPiuteInstability1.Introduction2.TheFluidEquations3-CalculatedphaseRelationsB.TransportTheory—Summary.C.LangmuirProbeTheory--SummaryD.DirectionalLangmulrProbe(DLP)—Summary

6、E.TheIonTemperatureExperimentalResultsA..TypicalExperimentalResults1.NormalizedWaveAmplitudesandRadialDensityprofile2.AxialProfiles3.ElectronandIonTemperaturesh.RadialElectricField5.RadialPotentialProfiles6.PhaseRelations7.DiffusionCoefficients-iv-Wave"Identification"931.Sp

7、atialLocation932.Frequency953.DirectionofPropagation100k.parallelWavelength1005.Measuredvs.CalculatedGrowthBate'1026.WaveIdentificationConclusions103EnhancedTransportandDCStabilization1031.EffectofDCStabilizationonDB.101*enh•2.Semi-quantitativeEffectofDenhontheDensityProfil

8、eIlkLinearFeedback(F)1181.EffectofLinearFeedbackonWaveAmplitudesandGrowthRates1202