Numerical study of different electron density observed in Hydrogen and Deuterium ion source plasmas

T. Shibata, R. Kato, H. Nakano, K. Hayashi, J. Sato, K. Miyamoto, K. Hoshino, A. Hatayama

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
Article number012002
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2022 Apr 25
Event19th International Conference on Ion Sources, ICIS 2021 - Virtual, Online
Duration: 2021 Sept 202021 Sept 24

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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