Electron properties of an emissive cathode: analysis with incoherent Thomson scattering, fluid simulations and Langmuir probe measurements
| Autor: | Stéphane Mazouffre, Laurent Garrigues, Sedina Tsikata, George-Cristian Potrivitu, Gaétan Sary, Benjamin Vincent |
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| Přispěvatelé: | Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), Groupe de Recherche Energétique, Plasmas et Hors Equilibre (LAPLACE-GREPHE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Thomson scattering Thermionic emission Electron 01 natural sciences 010305 fluids & plasmas law.invention symbols.namesake langmuir probe law Physics::Plasma Physics [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] Ionization 0103 physical sciences Langmuir probe 010302 applied physics incoherent thomson scattering plasma diagnostics Plasma Condensed Matter Physics Cathode hollow cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials numerical modeling symbols Physics::Accelerator Physics Plasma diagnostics thermionic emission fluid simulation Atomic physics |
| Zdroj: | Journal of Physics D: Applied Physics Journal of Physics D: Applied Physics, IOP Publishing, 2020, 53, pp.415202. ⟨10.1088/1361-6463/ab9974⟩ |
| ISSN: | 0022-3727 1361-6463 |
| DOI: | 10.1088/1361-6463/ab9974⟩ |
| Popis: | International audience; Emissive cathodes serve a key function as the electron source for Hall plasma thrusters. Development of reliable numerical models for their operation and information on plasma behavior requires the use of sensitive and accurate diagnostics. This paper discusses results from a combined experimental and numerical study of the plasma regimes and properties of a 5 A LaB 6 pellet emitter cathode. Electron properties across a range of currents (2-16 A) are determined for the first time using incoherent Thomson scattering. A 2D axisymmetric fluid code is adapted to the study of the electron properties of this cathode and the nature of regime transitions. Similar trends in the numerical and experimental results are found, such as transitions to plume-like behavior with increasing current; quantitative agreement would require the use of a combined thermal-plasma model for the cathode under study. Comparisons of results from non-invasive Thomson scattering to Langmuir probe measurements reveal limitations of the latter diagnostic for plasma characterization. |
| Databáze: | OpenAIRE |
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