Highly radiating type-III ELMy H-mode with low plasma core pollution

The impurity seeded type-III ELMy H-mode is proposed as an integrated ITER scenario. At JET this scenario has been demonstrated up to plasma currents of 3 MA with nitrogen as seeding gas. Detached divertor operation is achieved with significantly reduced steady state and transient heat fluxes. By operating in a high triangular magnetic configuration, very high central line-averaged electron densities are reached (up to 1.1 × 1020 m−3). The impurity sources and impurity concentration in the plasma core were investigated for a broad range of plasma conditions in those highly radiating plasmas. The results are compared to an integrated model of the plasma edge and plasma core. On the basis of this modelling extrapolations to ITER are done with neon seeding, giving more confidence that these radiative plasmas will have a power amplification factor in excess of 10.