| Modification of Boundary Fluctuations by LHCD in the HT—7 Tokamak |
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| 作者姓名： | SONGMei WANBao-Nian XUGuo-Sheng LINGBi-Li |
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| 作者单位： | InstituteofPlasmaPhysics,ChineseAcademyofSciences,POBox1126,Hefei230031 |
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| 摘 要： | Measurements of boundary fluctuations and fluctuation driven electron fluxes have been performed in ohmic and lower hybrid current drive enhanced confinement plasma using a graphite Langmuir probe array on HT-7 tokamak. The fluctuations are significantly suppressed and the turbulent fluxes are remarkably depressed in the enhanced plasma. We characterized the statistical properties of fluctuations and the particle flux and found a non-Gaussian character in the whole scrape-off layer with minimum deviations from Gaussian in the proximity of the velocity shear layer in ohmic plasma. In the enhanced plasma the deviations in the boundary region are all reduces obviously. The fluctuations and induced electron fluxes show sporadic bursts asymmetric in time and the asymmetry is remarkably weakened in the lower hybrid current driving (LHCD) phase. The results suggest a coupling between the statistical behaviour of fluctuations and the turbulent flow.
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| 关 键 词： | LHCD HT－7托卡马克装置 电子束 边界波动 等离子体 低杂电流驱动 热核装置 |
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