Journal
NUCLEAR FUSION
Volume 43, Issue 10, Pages 1272-1278Publisher
INT ATOMIC ENERGY AGENCY
DOI: 10.1088/0029-5515/43/10/031
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This paper reports results on the progress in steady-state high-beta(p) ELMy H-mode discharges in JT-60U. A fusion triple product, n(D) (0)tau(E)T(i) (0), of 3.1 x 10(20) m(-3) s keV under full non-inductive current drive has been achieved at I-p = 1.8 MA, which extends the record value of the fusion triple product under full non-inductive current drive by 50%. A high-beta plasma with beta(N) similar to 2.7 has been sustained for 7.4 s (similar to60tau(E)), with the duration determined only by the facility limits, such as the capability of the poloidal field coils and the upper limit on the duration of injection of neutral beams. Destabilization of neoclassical tearing modes (NTMs) has been avoided with good reproducibility by tailoring the current and pressure profiles. On the other hand, a real-time NTM stabilization system has been developed where detection of the centre of the magnetic island and optimization of the injection angle of the electron cyclotron wave are done in real time. By applying this system, a 3/2 NTM has been completely stabilized in a high-beta region (beta(p) similar to 1.2, beta(N) similar to 1.5), and the beta value and confinement enhancement factor have been improved by the stabilization.
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