Response of negative ion beamlet to RF field in beam extraction region
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866914923136679936 |
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| author | Nagaoka, Kenichi Nakano, Haruhisa Hamajima, Taiga Nakamoto, Ryoya Tsumori, Katsuyoshi Osakabe, Masaki Ikeda, Katsunori Kisaki, Masashi Miyamoto, Kenji Takahashi, Kazunori Fantz, Ursel |
| author_facet | Nagaoka, Kenichi Nakano, Haruhisa Hamajima, Taiga Nakamoto, Ryoya Tsumori, Katsuyoshi Osakabe, Masaki Ikeda, Katsunori Kisaki, Masashi Miyamoto, Kenji Takahashi, Kazunori Fantz, Ursel |
| contents | Beam-focusing characteristics of negative ion beams have been experimentally investigated with a superimposition of a controlled perturbation of 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 the RF frequency such that the oscillation is suppressed at perveance-matched conditions and at low RF frequency. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15749 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Response of negative ion beamlet to RF field in beam extraction region Nagaoka, Kenichi Nakano, Haruhisa Hamajima, Taiga Nakamoto, Ryoya Tsumori, Katsuyoshi Osakabe, Masaki Ikeda, Katsunori Kisaki, Masashi Miyamoto, Kenji Takahashi, Kazunori Fantz, Ursel Plasma Physics Accelerator Physics Beam-focusing characteristics of negative ion beams have been experimentally investigated with a superimposition of a controlled perturbation of 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 the RF frequency such that the oscillation is suppressed at perveance-matched conditions and at low RF frequency. |
| title | Response of negative ion beamlet to RF field in beam extraction region |
| topic | Plasma Physics Accelerator Physics |
| url | https://arxiv.org/abs/2312.15749 |