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4、FoundationsofDCplasmasources1,23,4JonTomasGudmundssonandAnteHecimovic1ScienceInstitute,UniversityofIceland,Dunhaga3,IS-107Reykjavik,Iceland2DepartmentofSpaceandPlasmaPhysics,SchoolofElectricalEngineering,KTH–RoyalInstituteofTechnology,SE-10044,Stockholm,Sweden3InstituteforExperimentalPhysicsII,Ruhr
5、-UniversityBochum,D-44801Bochum,Germany4Max-Planck-InstitutforPlasmaPhysics,Boltzmannstraße2,D-85748Garching,GermanyE-mail:tumi@hi.isReceived1March2017,revised25August2017Acceptedforpublication17October2017Published8November2017AbstractAtypicaldcdischargeisconfiguredwiththenegativecathodeatoneendand
6、apositiveanodeattheotherend,separatedbyagasfilledgap,placedinsidealongglasscylinder.Afewhundredvoltsbetweenthecathodeandanodeisrequiredtomaintainthedischarge.Thetypeofdischargethatisformedbetweenthetwoelectrodesdependsuponthepressureoftheworkinggas,thenatureoftheworkinggas,theappliedvoltageandthegeo
7、metryofthedischarge.Wediscussthecurrent–voltagecharacteristicsofthedischargeaswellasthedistinctstructurethatdevelopsintheglowdischargeregion.ThedcglowdischargeappearsinthedischargecurrentrangefromμAtomAat0.