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Summary of steady-state research during 23 years of JT-60 tokamak experiments

Kikuchi, Mitsuru

This talk summarizes the achievement of steady state research during 23 years of JT-60 tokamak experiment. Before the modification to JT-60U, up to 0.8 of plasma current was driven by the bootstrap current and the steady state tokamak reactor concept SSTR was proposed in 1990. For this assessment, theory of generalized Ohm's law in tokamak was developed. Negative shear configuration was first proposed in 1992 and becomes popular in advanced tokamak research up to now. Formation of internal transport barrier (ITB) in PS (1994) and NS (1997) leads to enhanced bootstrap current fraction in the core region. Non-inductive current drive physics of NBCD and ECCD was well developed using N-NBI and ECCD systems in JT-60U. A current hole (CH) was observed as unique structure formation in tokamak (2001). Stabilization of RWM in DIII-D and JT-60U with small toroidal rotation is important for reactor application to sustain high plasma pressure above no-wall limit (2007).

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