Spatial Distributions of Charged Particles and Plasma Potential before and during Beam Extraction in a Negative Hydrogen Ion Source for NBI
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- GENG Shaofei
- SOKENDAI (The Graduate University for Advanced Studies)
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- TSUMORI Katsuyoshi
- National Institute for Fusion Science
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- NAKANO Haruhisa
- National Institute for Fusion Science
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- KISAKI Masashi
- National Institute for Fusion Science
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- TAKEIRI Yasuhiko
- National Institute for Fusion Science
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- OSAKABE Masaki
- National Institute for Fusion Science
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- IKEDA Katsunori
- National Institute for Fusion Science
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- NAGAOKA Ken-ichi
- National Institute for Fusion Science
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- KANEKO Osamu
- National Institute for Fusion Science
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- SHIBUYA Masayuki
- National Institute for Fusion Science
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- NIFS NBI Group
- National Institute for Fusion Science
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Abstract
<p>In order to understand the physics of the production and extraction mechanism of negative ions, experiments with a single Langmuir probe are carried out to investigate the local spatial distribution of the plasma in the vicinity of the plasma grid in a negative hydrogen ion source. The results show that the electron density is lower in the aperture region than that in its peripheral region. It is attributed to the cusp magnetic field introduced with the electron deflection magnets near the plasma grid. In addition, the linkage of the filter field with the electron deflection magnetic field contributes to the increment of electron density. The profile of plasma potential indicates that an electric field exists between the aperture and its peripheral region, and then a local negative ion flow can be introduced near the plasma grid.</p>
Journal
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- Plasma and Fusion Research
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Plasma and Fusion Research 10 (0), 3405016-3405016, 2015
The Japan Society of Plasma Science and Nuclear Fusion Research
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Details 詳細情報について
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- CRID
- 1390001205254112384
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- NII Article ID
- 130005302874
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- NII Book ID
- AA12346675
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- ISSN
- 18806821
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- HANDLE
- 10655/00013377
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed