Research plan for long-pulse/steady-state experiments in LHD

When a long-pulse operation once obtained with a power level of more than several hundreds kW, physical and technological experimental programs will be possible with this long-pulse condition. Parametric survey on bootstrap current and energy transport can be performed within one shot by real time swing of the magnetic configuration. A long-pulse/steady-state operation is essential for a net erosion study of plasma facing surfaces and demonstration of electric power generation. Particle control is necessary for the steady state operation, and a study on gaseous impurities and hydrogen recycling is important with the active pumping condition. A start-up scenario of the long-pulse operation is proposed. (author)