Influence of H{sup -} velocity on H{sup -} extraction probability from a negative ion source
- Tokushima Bunri University, Nishihama, Yamashiro-cho, Tokushima 770-8514 (Japan)
- National Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)
- Japan Atomic Energy Agency, Rokkasho, Aomori 039-3212 (Japan)
- Harima Institute, RIKEN, Hyogo 679-5148 (Japan)
- Graduate School of Engineering, Tohoku University, Sendai 980-8579 (Japan)
- Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)
We investigate influence of H{sup -} initial transport direction and kinetic energy on H{sup -} extraction probability with three-dimensional Monte Carlo calculation. As a result, lower energy H{sup -} ions are strongly trapped by the electrical potential structure, so that initial condition of H{sup -} transport direction is cancelled by alignment of the electric field; thus, it has lower influence for H{sup -} extraction probability. Besides, the potential hill induced by the beam extraction voltage more effectively enhances H{sup -} extraction probability for the lower energy H{sup -} ions. The correlation between the magnitude of the local plasma potential near the extraction region and the mean velocity of H{sup -} ions in the region should determine the H{sup -} extraction probability from the ion source.
- OSTI ID:
- 22053888
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 2; Conference: ICIS 2009: 13. international conference on ion sources, Gatlinburg, TN (United States), 20-25 Sep 2009; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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