Advances in EAST long pulse H-mode experiment and contributions to steady state operation of ITER

The demonstration of 100 seconds time scale long-pulse steady-state scenario with good plasma performance (H_98y2 ~ 1.1) and good control of impurity and heat exhaust with ITER-like tungsten divertor has been successfully achieved on EAST using RF power heating and current drive. This steady-state scenario was characterized by fully non-inductive current drive and high-frequency edge localized modes (ELMs). The operational window has been extended towards a high β_Pregime with integrated small-ELM (ISE) regime, which is a promising operational regime for future ITER long-pulse operation. Utilizing ECRH yields two significant advantages: a decrease of up to 40% in tungsten concentration in the core plasma, and an increase in the electrons which can resonate with the LH waves, resulting in enhanced current drive when combining ECCD and LHCD. In addition, the reduction of the peak heat flux on the divertor was successfully demonstrated either in a quasi snow-flake (QSF) configuration or exploiting the active radiation feedback control. The experience in and understanding of high-performance long-pulse operation on EAST will be extremely valuable for ITER.