| Original Articles |
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High Bootstrap Current Fraction during the Synergy of LHCD and IBW on the HT-7 Tokamak |
| ZHANG Xian-Mei;WAN Bao-Nian;WU Zhen-Wei;HT-7 Team |
| 1Department of Physics, East China University of Science and Technology, Shanghai 200237
2Institute of Plasma Physics, Chinese academy of Sciences, PO Box 1126, Hefei 230031 |
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| Cite this article: |
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ZHANG Xian-Mei, WAN Bao-Nian, WU Zhen-Wei et al 2005 Chin. Phys. Lett. 22 1468-1470 |
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Abstract More than 70% of the total plasma current is sustained by the bootstrap current and current drive during the synergy of lower hybrid current driving (LHCD) and ion Berstein wave (IBW) heating on the HT-7 tokamak. The lower hybrid non-inductive current source is off-axis and well localized, and more than 35% bootstrap current plasma has been obtained. The IBW in controlling electron pressure profile can be integrated into the LHCD target plasma. The largest steep gradient of the electron pressure profile in the region ρ～0.5-0.7 mostly comes from the electron temperature profile, which may induce the large fraction bootstrap current. The large off-axis bootstrap current can help to create negative magnetic shear, and the good plasma confinement is achieved.
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| Keywords:
52.55.Dy
52.50.Qt
52.55.Fa
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Published: 01 June 2005
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| PACS: |
52.55.Dy
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(General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)
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52.50.Qt
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(Plasma heating by radio-frequency fields; ICR, ICP, helicons)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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