Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors
In parallel to the developments dedicated to the ITER neutral beam (NB) system, CEA-IRFM with laboratories in France and Switzerland are studying the feasibility of a new generation of NB system able to provide heating and current drive for the future DEMOnstration fusion reactor. For the steady-sta...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2016-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/18/12/125005 |
| _version_ | 1827873593421201408 |
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| author | A Simonin R Agnello S Bechu J M Bernard C Blondel J P Boeuf D Bresteau G Cartry W Chaibi C Drag B P Duval H P L de Esch G Fubiani I Furno C Grand Ph Guittienne A Howling R Jacquier C Marini I Morgal |
| author_facet | A Simonin R Agnello S Bechu J M Bernard C Blondel J P Boeuf D Bresteau G Cartry W Chaibi C Drag B P Duval H P L de Esch G Fubiani I Furno C Grand Ph Guittienne A Howling R Jacquier C Marini I Morgal |
| author_sort | A Simonin |
| collection | DOAJ |
| description | In parallel to the developments dedicated to the ITER neutral beam (NB) system, CEA-IRFM with laboratories in France and Switzerland are studying the feasibility of a new generation of NB system able to provide heating and current drive for the future DEMOnstration fusion reactor. For the steady-state scenario, the NB system will have to provide a high NB power level with a high wall-plug efficiency ( η ∼ 60%). Neutralization of the energetic negative ions by photodetachment (so called photoneutralization), if feasible, appears to be the ideal solution to meet these performances, in the sense that it could offer a high beam neutralization rate (>80%) and a wall-plug efficiency higher than 60%. The main challenge of this new injector concept is the achievement of a very high power photon flux which could be provided by 3 MW Fabry–Perot optical cavities implanted along the 1 MeV D ^− beam in the neutralizer stage. The beamline topology is tall and narrow to provide laminar ion beam sheets, which will be entirely illuminated by the intra-cavity photon beams propagating along the vertical axis. The paper describes the present R&D (experiments and modelling) addressing the development of a new ion source concept (Cybele source) which is based on a magnetized plasma column. Parametric studies of the source are performed using Langmuir probes in order to characterize and compare the plasma parameters in the source column with different plasma generators, such as filamented cathodes, radio-frequency driver and a helicon antenna specifically developed at SPC-EPFL satisfying the requirements for the Cybele (axial magnetic field of 10 mT, source operating pressure: 0.3 Pa in hydrogen or deuterium). The paper compares the performances of the three plasma generators. It is shown that the helicon plasma generator is a very promising candidate to provide an intense and uniform negative ion beam sheet. |
| first_indexed | 2024-03-12T16:39:18Z |
| format | Article |
| id | doaj.art-3d3a09ca052d4d83a52dffb62289cee8 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:39:18Z |
| publishDate | 2016-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-3d3a09ca052d4d83a52dffb62289cee82023-08-08T14:35:19ZengIOP PublishingNew Journal of Physics1367-26302016-01-01181212500510.1088/1367-2630/18/12/125005Negative ion source development for a photoneutralization based neutral beam system for future fusion reactorsA Simonin0R Agnello1S Bechu2https://orcid.org/0000-0003-3333-8991J M Bernard3C Blondel4J P Boeuf5D Bresteau6G Cartry7W Chaibi8C Drag9B P Duval10H P L de Esch11G Fubiani12I Furno13C Grand14Ph Guittienne15A Howling16R Jacquier17C Marini18https://orcid.org/0000-0003-4819-7765I Morgal19CEA, IRFM, F-13108 St Paul lez Durance, FranceEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandLPSC, Université Grenoble-Alpes , CNRS/IN2P3, F-38026 Grenoble FranceCEA, IRFM, F-13108 St Paul lez Durance, FranceLaboratoire Aimé-Cotton (LAC), CNRS, université Paris-Sud , école normale supérieure de Cachan, bât. 505, F-91405 Orsay cedex, FranceLaboratoire Plasma et Conversion d’Energie, LAPLACE, P. Sabatier University , F-Toulouse, FranceLaboratoire Aimé-Cotton (LAC), CNRS, université Paris-Sud , école normale supérieure de Cachan, bât. 505, F-91405 Orsay cedex, FranceAix Marseille Univ , CNRS, PIIM, Marseille, FranceARTEMIS, OCA, CNRS, Université Côte d’Azur , Boulevard de l’Observatoire, F-06304 Nice, FranceLaboratoire Aimé-Cotton (LAC), CNRS, université Paris-Sud , école normale supérieure de Cachan, bât. 505, F-91405 Orsay cedex, FranceEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandCEA, IRFM, F-13108 St Paul lez Durance, FranceLaboratoire Plasma et Conversion d’Energie, LAPLACE, P. Sabatier University , F-Toulouse, FranceEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandCEA, IRFM, F-13108 St Paul lez Durance, FranceHelyssen, Route de la Louche 31, CH-1092 Belmont-sur-Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center, CH-1015 Lausanne, SwitzerlandAix Marseille Univ , CNRS, PIIM, Marseille, FranceIn parallel to the developments dedicated to the ITER neutral beam (NB) system, CEA-IRFM with laboratories in France and Switzerland are studying the feasibility of a new generation of NB system able to provide heating and current drive for the future DEMOnstration fusion reactor. For the steady-state scenario, the NB system will have to provide a high NB power level with a high wall-plug efficiency ( η ∼ 60%). Neutralization of the energetic negative ions by photodetachment (so called photoneutralization), if feasible, appears to be the ideal solution to meet these performances, in the sense that it could offer a high beam neutralization rate (>80%) and a wall-plug efficiency higher than 60%. The main challenge of this new injector concept is the achievement of a very high power photon flux which could be provided by 3 MW Fabry–Perot optical cavities implanted along the 1 MeV D ^− beam in the neutralizer stage. The beamline topology is tall and narrow to provide laminar ion beam sheets, which will be entirely illuminated by the intra-cavity photon beams propagating along the vertical axis. The paper describes the present R&D (experiments and modelling) addressing the development of a new ion source concept (Cybele source) which is based on a magnetized plasma column. Parametric studies of the source are performed using Langmuir probes in order to characterize and compare the plasma parameters in the source column with different plasma generators, such as filamented cathodes, radio-frequency driver and a helicon antenna specifically developed at SPC-EPFL satisfying the requirements for the Cybele (axial magnetic field of 10 mT, source operating pressure: 0.3 Pa in hydrogen or deuterium). The paper compares the performances of the three plasma generators. It is shown that the helicon plasma generator is a very promising candidate to provide an intense and uniform negative ion beam sheet.https://doi.org/10.1088/1367-2630/18/12/125005photoneutralizationheliconinductively coupled plasmaion beam sheetplasma modelling |
| spellingShingle | A Simonin R Agnello S Bechu J M Bernard C Blondel J P Boeuf D Bresteau G Cartry W Chaibi C Drag B P Duval H P L de Esch G Fubiani I Furno C Grand Ph Guittienne A Howling R Jacquier C Marini I Morgal Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors New Journal of Physics photoneutralization helicon inductively coupled plasma ion beam sheet plasma modelling |
| title | Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| title_full | Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| title_fullStr | Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| title_full_unstemmed | Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| title_short | Negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| title_sort | negative ion source development for a photoneutralization based neutral beam system for future fusion reactors |
| topic | photoneutralization helicon inductively coupled plasma ion beam sheet plasma modelling |
| url | https://doi.org/10.1088/1367-2630/18/12/125005 |
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