Impact of divertor configuration on H-mode access and confinement on EAST

A good control of plasma wall interactions is of great importance to obtaining and maintaining high energy confinement in high-power long-pulse discharges. Future devices will require a high scrape-off layer (SOL) density to avoid high-Z sputtering. However, some parameters such as divertor configuration are not included in existing scaling laws, making extrapolations to future larger devices difficult. It is vital to understand the impact of divertor conditions on H-mode plasma in order to make engineering designs and operational scenarios most favorable to high fusion gain.