Sequences of hydrogen (H) and deuterium (D) experiments have been done by NIFS research and development negative ion source (RNIS) for the deuterium NBI development. In the experiments, the co-extracted electron current with the negative ions and the electron density in the plasma generation region in the D experiment have been around three times higher than that in the H experiment. To explain the difference of the electron density in the RNIS driver region, a zero-dimensional numerical model is developed in the present study. The model only focuses on the isotope effect for vibrationally excited level of electronically grounded state molecules and its relevant cross-sections. The calculation results show that difference of the ionization channel numbers via molecular vibrationally excited states could be a reason to enhance ionization rate in D plasma.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2022 4月 25|
|イベント||19th International Conference on Ion Sources, ICIS 2021 - Virtual, Online|
継続期間: 2021 9月 20 → 2021 9月 24
ASJC Scopus subject areas