ELMy H-mode with high- betaNand high- beta p in JT-60U

By modification of current and heat deposition profiles, the integrated core plasma performance was improved in ELMy H-mode. In a quasi steady state, beta p approximately 2.5-3, beta N approximately 2.5-3.1 and H-factor approximately 1.8-2.1 were sustained simultaneously under the full current drive condition (bootstrap current 55%, beam driven current 45% at I p =0.5MA). The achievable beta p value and the energy confinement performance increases systematically with safety factor at the edge q eff and a high q eff operation (q eff >6) is required to obtain favorable integrated performance. To obtain these improved high beta ELMy plasmas, it is essential to control MHD activities; suppression of beta p -collapse and control of ELM activity.