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Lower hybrid current drive experiments with graphite limiters in the HT-7 superconducting tokamak |
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| Authors: | J. Liu X. Gao L.Q. Hu M. Asif Z.Y. Chen B.J. Ding Q. Zhou H.Q. Liu Y.X. Jie W. Kong S.Y. Lin Y.H. Ding L. Gao Q. Xu the HT- Team |
| Affiliation: | Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, PR China |
| Abstract: | Recent progress of lower hybrid (LH) experiments with new graphite limiters configuration in the HT-7 tokamak is presented. The lower hybrid current drive (LHCD) efficiency can be determined by fitting based on experimental data. Improved particle confinement was observed via LHCD (PLHW>300 kW) characterized by the particle confinement time τp increased about 1.56 times. It is found that runaways are suppressed during loop voltage is decreasing at the flat-top phase of LH discharges. The main limitations of pulse length are presented in long-pulse experiments with new limiter configuration. |
| Keywords: | Lower hybrid current drive Graphite limiter Confinement improvement Long-pulse discharge |
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