2009 Fiscal Year Final Research Report
Verification of role of ion viscosity for a transition to improved confinement mode in helical plasmas
| Project/Area Number |
20860089
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| Research Category |
Grant-in-Aid for Young Scientists (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 | National Institute for Fusion Science |
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Principal Investigator |
TAKAHASHI Hiromi National Institute for Fusion Science, 大型ヘリカル研究部, 助教 (00462193)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 核融合 / プラズマ / 磁場閉じ込め / 閉じ込め改善モード / イオン粘性 / ポロイダルフロー / ヘリカル系 / 電極バイアス |
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| Research Abstract |
We carried out electrode biasing experiments in the LHD and the Heliotron-J. The transition with the negative plasma resistance was successfully achieved during applying triangular-waveform voltage in ECRH discharges. The improvement of the stored energy, the depression of the density fluctuation and the other phenomena indicating the confinement improvement are observed in the forward transition. The threshold voltage was different between forward transition and backward one and the hysteresis was observed in the voltage-current curve.
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