Speaker
Description
In order to understand the physical mechanisms governing beam convergence, which is a critical issue in negative ion sources, numerical analyses of the extraction region considering surface-production have been conducted. Previous Particle-in-Cell (PIC) simulations have demonstrated that the relationship between surface-produced negative hydrogen ions and the potential structure affects the beam emitting surface and beam convergence. Nevertheless, under the deuterium operation required for future Neutral Beam Injection systems, isotope effects are expected to alter the interdependence among surface-produced negative deuterium ions, the potential structure, and beam convergence. In this study, the physics of beam extraction in deuterium negative ion sources are analyzed using a 3D-PIC code, and the impact of isotope effects on beam optics will be discussed in comparison with hydrogen cases.
| Email address | hayashi.katsuya@nifs.ac.jp |
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| Visitor's Visa | no |
| Classification | Numerical simulations of sources, beams, space-charge, ion-optics |