| Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak |
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| 作者姓名： | 宋梅 万宝年 徐国盛 刘海庆 凌必利 李成富 周立武 |
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| 作者单位： | InstituteofPlasmaPhysics,ChineseAcademyofSciences,Hefei230031,China |
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| 基金项目： | The project supported by the National Natural Science Foundation of China(No.10175069) |
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| 摘 要： | Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-maX. In the enhanced confinement plasma~ the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma.Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations us-ing a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes.
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| 关 键 词： | 托卡马克装置 等离子体 边界参数 波动 IBW LHCD 核聚变 HT-7装置 |
Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak |
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| Song Mei Wan Baonian Xu Guosheng
Liu Haiqing,Ling Bili,Li Chengfu
Zhou Liwu
Institute of Plasma Physics,Chinese Academy of Sciences,Hefei ,China.Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak[J].Plasma Science & Technology,2003,5(4):1861-1866. |
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| Authors: | Song Mei Wan Baonian Xu Guosheng
Liu Haiqing Ling Bili Li Chengfu
Zhou Liwu
Institute of Plasma Physics Chinese Academy of Sciences Hefei China |
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| Affiliation: | Song Mei Wan Baonian Xu Guosheng
Liu Haiqing,Ling Bili,Li Chengfu
Zhou Liwu
Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China |
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| Abstract: | Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-mak. In the enhanced confinement plasma, the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma. Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations using a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes. |
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| Keywords: | tokamak fast Langmuir probe ion bernstein wave lower hybrid current drive |
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