Response of negative ion beamlet width and axis deflection to RF field in beam extraction region
Abstract Beam-divergence characteristics of single negative ion beamlet have been experimentally investigated with a superimposition of a controlled perturbation of a radio frequency wave (RF) field in a filament-arc discharge negative ion source. Oscillations of a negative-ion beamlet width and axi...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-81334-w |
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| _version_ | 1832594674526715904 |
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| author | Kenichi Nagaoka Haruhisa Nakano Taiga Hamajima Ryoya Nakamoto Katsuyoshi Tsumori Masaki Osakabe Masashi Kisaki Kenji Miyamoto Kazunori Takahashi Ursel Fantz |
| author_facet | Kenichi Nagaoka Haruhisa Nakano Taiga Hamajima Ryoya Nakamoto Katsuyoshi Tsumori Masaki Osakabe Masashi Kisaki Kenji Miyamoto Kazunori Takahashi Ursel Fantz |
| author_sort | Kenichi Nagaoka |
| collection | DOAJ |
| description | Abstract Beam-divergence characteristics of single negative ion beamlet have been experimentally investigated with a superimposition of a controlled perturbation of a radio frequency wave (RF) field in a filament-arc discharge negative ion source. Oscillations of a negative-ion beamlet width and axis responding to the RF perturbation were observed, which may be a cause of the larger beam divergence angle of the RF negative ion source for ITER. It is pointed out that the oscillation of the beamlet width depends on the perveance and on an RF frequency such that the oscillation is suppressed at perveance-matched conditions and at low RF frequency. |
| format | Article |
| id | doaj-art-1e76a0f3d20d4be0847ded3cd7f373fd |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-1e76a0f3d20d4be0847ded3cd7f373fd2025-01-19T12:23:39ZengNature PortfolioScientific Reports2045-23222025-01-011511810.1038/s41598-024-81334-wResponse of negative ion beamlet width and axis deflection to RF field in beam extraction regionKenichi Nagaoka0Haruhisa Nakano1Taiga Hamajima2Ryoya Nakamoto3Katsuyoshi Tsumori4Masaki Osakabe5Masashi Kisaki6Kenji Miyamoto7Kazunori Takahashi8Ursel Fantz9National Institute for Fusion ScienceNational Institute for Fusion ScienceNagoya UniversityIHI cooperationNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceNaruto University for EducationDepartment of Electrical Engineering, Tohoku UniversityMax-Planck Institute for Plasma PhysicsAbstract Beam-divergence characteristics of single negative ion beamlet have been experimentally investigated with a superimposition of a controlled perturbation of a radio frequency wave (RF) field in a filament-arc discharge negative ion source. Oscillations of a negative-ion beamlet width and axis responding to the RF perturbation were observed, which may be a cause of the larger beam divergence angle of the RF negative ion source for ITER. It is pointed out that the oscillation of the beamlet width depends on the perveance and on an RF frequency such that the oscillation is suppressed at perveance-matched conditions and at low RF frequency.https://doi.org/10.1038/s41598-024-81334-wSheath with negative ionRF negative ion sourcePerveance |
| spellingShingle | Kenichi Nagaoka Haruhisa Nakano Taiga Hamajima Ryoya Nakamoto Katsuyoshi Tsumori Masaki Osakabe Masashi Kisaki Kenji Miyamoto Kazunori Takahashi Ursel Fantz Response of negative ion beamlet width and axis deflection to RF field in beam extraction region Scientific Reports Sheath with negative ion RF negative ion source Perveance |
| title | Response of negative ion beamlet width and axis deflection to RF field in beam extraction region |
| title_full | Response of negative ion beamlet width and axis deflection to RF field in beam extraction region |
| title_fullStr | Response of negative ion beamlet width and axis deflection to RF field in beam extraction region |
| title_full_unstemmed | Response of negative ion beamlet width and axis deflection to RF field in beam extraction region |
| title_short | Response of negative ion beamlet width and axis deflection to RF field in beam extraction region |
| title_sort | response of negative ion beamlet width and axis deflection to rf field in beam extraction region |
| topic | Sheath with negative ion RF negative ion source Perveance |
| url | https://doi.org/10.1038/s41598-024-81334-w |
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