Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes
Even after half a century of development, many phenomena in Hall Effect Thrusters are still not well-understood. While numerical studies are now widely used to study this highly non-linear system, experimental diagnostics are needed to validate their results and identify specific oscillations. By va...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/11/5/518 |
| _version_ | 1797567659552800768 |
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| author | Victor Désangles Sergey Shcherbanev Thomas Charoy Noé Clément Clarence Deltel Pablo Richard Simon Vincent Pascal Chabert Anne Bourdon |
| author_facet | Victor Désangles Sergey Shcherbanev Thomas Charoy Noé Clément Clarence Deltel Pablo Richard Simon Vincent Pascal Chabert Anne Bourdon |
| author_sort | Victor Désangles |
| collection | DOAJ |
| description | Even after half a century of development, many phenomena in Hall Effect Thrusters are still not well-understood. While numerical studies are now widely used to study this highly non-linear system, experimental diagnostics are needed to validate their results and identify specific oscillations. By varying the cathode heating current, its emissivity is efficiently controlled and a transition between two functioning regimes of a low power thruster is observed. This transition implies a modification of the axial electric field and of the plasma plume shape. High-speed camera imaging is performed and the data are analysed using a Proper Orthogonal Decomposition method to isolate the different types of plasma fluctuations occurring simultaneously. The low-frequency breathing mode is observed, along with higher frequency rotating modes that can be associated to rotating spokes or gradient-induced instabilities. These rotating modes are observed while propagating outside the thruster channel. The reduction of the cathode emissivity beyond the transition comes along with a disappearance of the breathing mode, which could improve the thruster performance and stability. |
| first_indexed | 2024-03-10T19:45:33Z |
| format | Article |
| id | doaj.art-3e0349cd315847ce9f45c6d1dcaab072 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T19:45:33Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-3e0349cd315847ce9f45c6d1dcaab0722023-11-20T00:49:22ZengMDPI AGAtmosphere2073-44332020-05-0111551810.3390/atmos11050518Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating RegimesVictor Désangles0Sergey Shcherbanev1Thomas Charoy2Noé Clément3Clarence Deltel4Pablo Richard5Simon Vincent6Pascal Chabert7Anne Bourdon8Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique, University Lyon, Ens de Lyon, University Claude Bernard, CNRS, F-69342 Lyon, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceLaboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, Sorbonne Université, Université Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSL Research University, F-91128 Palaiseau, FranceEven after half a century of development, many phenomena in Hall Effect Thrusters are still not well-understood. While numerical studies are now widely used to study this highly non-linear system, experimental diagnostics are needed to validate their results and identify specific oscillations. By varying the cathode heating current, its emissivity is efficiently controlled and a transition between two functioning regimes of a low power thruster is observed. This transition implies a modification of the axial electric field and of the plasma plume shape. High-speed camera imaging is performed and the data are analysed using a Proper Orthogonal Decomposition method to isolate the different types of plasma fluctuations occurring simultaneously. The low-frequency breathing mode is observed, along with higher frequency rotating modes that can be associated to rotating spokes or gradient-induced instabilities. These rotating modes are observed while propagating outside the thruster channel. The reduction of the cathode emissivity beyond the transition comes along with a disappearance of the breathing mode, which could improve the thruster performance and stability.https://www.mdpi.com/2073-4433/11/5/518electric propulsionplasma instabilitiesHET regimeHET oscillatory phenomenonproper orthogonal decomposition (POD) |
| spellingShingle | Victor Désangles Sergey Shcherbanev Thomas Charoy Noé Clément Clarence Deltel Pablo Richard Simon Vincent Pascal Chabert Anne Bourdon Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes Atmosphere electric propulsion plasma instabilities HET regime HET oscillatory phenomenon proper orthogonal decomposition (POD) |
| title | Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes |
| title_full | Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes |
| title_fullStr | Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes |
| title_full_unstemmed | Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes |
| title_short | Fast Camera Analysis of Plasma Instabilities in Hall Effect Thrusters Using a POD Method under Different Operating Regimes |
| title_sort | fast camera analysis of plasma instabilities in hall effect thrusters using a pod method under different operating regimes |
| topic | electric propulsion plasma instabilities HET regime HET oscillatory phenomenon proper orthogonal decomposition (POD) |
| url | https://www.mdpi.com/2073-4433/11/5/518 |
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