Modelling of Hybrid Scenario: From Present-day Experiments Toward ITER
The 'hybrid' scenario is an attractive operating scenario for ITER since it combines long plasma duration with the reliability of the reference H-mode regime. We review the recent European modelling effort carried out within the ITER Scenario Modelling group which aims at (i) understanding the underlying physics of the hybrid regime in ASDEX-Upgrade and JET, and, (ii) extrapolating them toward ITER. JET and ASDEX-Upgrade hybrid scenarios performed under different experimental conditions have been simulated in an interpretative and predictive way in order to address the current profile dynamics and its link with core confinement, the relative importance of magnetic shear, s, and E¥B flow shear on the core turbulence, pedestal stability and H-L transition. Projections to ITER hybrid scenarios have been carried out focusing on optimization of the heating/current drive schemes to reach and control the desired plasma equilibrium using ITER actuators.