| Original Articles |
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Measurements of Boundary Plasma in Synergy Discharges of IBW and LHCD on the HT-7 Tokamak |
| SONG Mei;WAN Bao-Nian;XU Guo-Sheng;CHEN Zhong-Yong;LIU Hai-Qing;LING Bi-Li;LI Cheng-Fu |
| Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei 230031
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| Cite this article: |
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SONG Mei, WAN Bao-Nian, XU Guo-Sheng et al 2003 Chin. Phys. Lett. 20 1781-1784 |
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Abstract By applying ion Bernstein wave (IBW) heating into the lower hybrid current drive (LHCD) plasma, improved confinements have been obtained in the HT-7 tokamak. The central electron temperature was doubled and the storage energy was increased significantly. The core electron density and temperature were broadened and their profiles near the edge were steepened. A transport barrier has been formed in the vicinity of the limiter radial location. An enhanced shear in poloidal phase velocity was found in the same region with reduction of the fluctuation levels and the coherences between fluctuations. The results suggest that the improved confinement in the IBW and LHCD plasma is at least partially due to the modification of shear in poloidal velocity and then the suppression of fluctuations and fluctuation induced fluxes via de-correlation effect.
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| Keywords:
52.25.Gj
52.50.Sw
52.40.Hf
52.55.Fa
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Published: 01 October 2003
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| PACS: |
52.25.Gj
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(Fluctuation and chaos phenomena)
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52.50.Sw
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(Plasma heating by microwaves; ECR, LH, collisional heating)
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52.40.Hf
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(Plasma-material interactions; boundary layer effects)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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