2011 Fiscal Year Final Research Report
Characteristics of negative hydrogen ions near the low work function surface in a Radio Frequency negative ion source
| Project/Area Number |
22860009
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Tohoku University |
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Principal Investigator |
TANAKA Nozomi 東北大学, 大学院・工学研究科, 助教 (60581296)
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| Project Period (FY) |
2010 – 2011
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| Keywords | プラズマ加熱 / 水素負イオン源 / RF負イオン源 / 負イオン密度計測 / Cavity-Ring-Down法 |
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| Research Abstract |
Characteristics of negative hydrogen ion (H^-)density in a RF ion source were studied. Cavity Ring Down (CRD)method was utilized for H^-measurements. The H^-density increased as the electron density with increase of input RF power or improvement of plasma confinement. A large increase in H^-density was observed with decreasing gas pressure, and increase of electron temperature was observed in the driver. This implies : 1)increase of vibrationally excited hydrogen molecules that forms H^-ions in the source, and 2)decrease of dissociation process of H^-due to collisions with hydrogen molecules.
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