Speaker
Description
In the Research and Development Negative Ion Source (RNIS) at NIFS, it has been reported that switching the operational gas from hydrogen (H) to deuterium (D) leads to an approximate threefold increase in electron density [1].
In previous studies [2,3], hydrogen isotope effects were investigated using a three-dimensional kinetic electron transport code, KEIO-MARC, together with a rate-equation model. In these studies, two models were integrated, enabling a self-consistent analysis of the electron energy distribution function, the background plasma density and neutral density. Initial results indicated that the electron density in the driver region increased by approximately 10% due to isotope effects [3].
In this study, hydrogen isotope effects were investigated in greater detail. The results revealed that the electron density near the plasma grid (PG) in the D case was up to 2.56 times higher than that in the H case, consistent with experimental observations. In the presentation, the mechanisms underlying the enhanced isotope effects will also be discussed.
| Email address | hayato0614s@keio.jp |
|---|---|
| Visitor's Visa | no |
| Classification | Numerical simulations of sources, beams, space-charge, ion-optics |
| Footnote | [1] H. Nakano, et al., J. J. Appl. Phys. 59, SHHC09 (2020). [2] K. Iwanaka, et al., 20th ICIS, Victoria Canada, September 2023. [3] H. Soejima, et al., J. Phys.: Conf. Ser. 3237 012015 (2026). |