Modelling of non-linear edge harmonic oscillations and the effect of non-axisymmetric magnetic coils

The Quiescent High confinement operational mode (QH-mode) offers an excellent alterna- tive to the well known H-mode due the absence of ELMs while keeping similar plasma performance. A feature of QH-mode is that a continuous long wavelength perturbation called Edge Harmonic Oscillation (EHO) saturates non-linearly, enhancing particle transport in the edge thus avoiding impurity accumulation in the core plasma. Given the importance of EHO in QH-mode, it could be useful for control and reproduction of robust QH-mode scenarios to assess how non-axisymmetric resonant magnetic perturbations couple with EHO. This could help for example to modify the main characteristics of QH-mode discharges while keeping constant the key elements needed to achieve QH-mode. With that in mind, the effect of global toroidal mode seeding in the vacuum magnetic field is investigated.