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T. Morisaki, M. Goto, R. Sakamoto, J. Miyazawa, S. Masuzaki, G. Motojima, M. Kobayashi, K. Tanaka, Y. Suzuki, N. Ohyabu, H. Yamada, A. Komori and LHD Experiment Group
Progress of Superdense Plasma Research in LHD: Sustainment and Transport Study
Date of publication:
22 IAEA Fusion Energy Conference, EX/1-5
The superdense core (SDC) plasma with the formation of the internal diffusion barrier (IDB) has been obtained in the Large Helical Device (LHD). Recently the IDB-SDC plasma with central electron density of ~ 2 ¡ß 10^20 m^-3 could successfully be sustained for more than 3 seconds. The IDB was robustly maintained against the strong perturbation of fuelling pellets. No serious increase in radiation power or impurity accumulation was seen during the discharge. In such a high density regime, a large Shafranov shift takes place which strongly modifies the edge magnetic topology. Therefore it is interesting to investigate the transport properties in the modified edge region which surrounds the SDC plasma. The active experiments with resonant magnetic perturbation (RMP) were performed to further modify the edge magnetic topology. The pump-out effect for particles was clearly observed in the edge region with RMP.
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