Response of negative ion beamlet width and axis deflection to RF field in beam extraction region
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.
Authors
- Taiga Hamajima
- Haruhisa Nakano
- Ryoya Nakamoto
- M. Kisaki
- K. Tsumori (ORCID: https://orcid.org/0000-0001-6161-8566)
- Kazunori Takahashi (ORCID: https://orcid.org/0000-0001-5690-1893)
- K. Miyamoto (ORCID: https://orcid.org/0000-0001-8738-2555)
- M. Osakabe (ORCID: https://orcid.org/0000-0001-5220-947X)
- K. Nagaoka (ORCID: https://orcid.org/0000-0002-5892-6047)
- U. Fantz (ORCID: https://orcid.org/0000-0003-2239-3477)
Institutions
- Japan International Cooperation Agency (JP)
- Naruto University of Education (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Tohoku University (JP)
- National Institute for Fusion Science (JP)
- National Institutes for Quantum Science and Technology (JP)
- Denso (Japan) (JP)
- Max Planck Institute for Plasma Physics (DE)
- Nagoya University (JP)
- Nagaoka University of Technology (JP)
Publication Details
- Journal
- Scientific Reports
- Published
- 2025-01-16
- DOI
- https://doi.org/10.1038/s41598-024-81334-w
- Citations
- 1
- Primary Topic
- Particle accelerators and beam dynamics
- Type
- article
- Field-Weighted Citation Impact
- 4.99
Funders
- Nagaoka University of Technology
- Japan Society for the Promotion of Science
- National Institute for Fusion Science