| Original Articles |
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Observation of Lower Hybrid Current Drive Improved Confinement
with a Graphite Probe at the Last Closed Flux Surface of the HT-7 Tokamak |
| XU Guo-Sheng;WAN Bao-Nian;SONG Mei;LING Bi-Li;KUANG Guang-Li;DING Bo-Jiang |
| Institute of Plasma Physics, Chinese Academy of Sciences,
Hefei 230031 |
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| Cite this article: |
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XU Guo-Sheng, WAN Bao-Nian, SONG Mei et al 2002 Chin. Phys. Lett. 19 1316-1318 |
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Abstract High time resolution measurements of the electrostatic fluctuations, radial electric field Er and turbulence-induced electron flux Γe have been performed across the transition of lower-hybrid-current-drive-improved confinement with a graphite Langmuir probe array at the last closed flux surface of HT-7 tokamak. The decrease of Γe is dominated by the suppression of fluctuation levels, which follows the change of Er. A reversion of the poloidal propagation direction of turbulence demonstrates that the poloidal propagation is dominated by Er x BФ drift. The enhancement of poloidal coherence accompanies the fluctuation suppression, which suggests the subtle variation of turbulence features.
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| Keywords:
52.55.Fa
52.25.Fi
52.35.Ra
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Published: 01 September 2002
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