Abstract
Abstract The linear MHD peeling-ballooning stability analysis on the ELM-free phase of MAST Upgrade H-mode plasma is presented. In contrast to other similar discharges, #47018 is found to have significantly higher and wider pedestal during an ELM-free H-mode phase that lasts for approximately 80ms, which is made possible by the reduced core MHD mode activity on q=2 surface. During this period, there is sustained decoupling of peeling and ballooning branches of the stability boundary on J-α space, opening an access channel to the second stability regime with higher peaks in pedestal current density J N,ped and pressure gradient (α). Such decoupling of the stability boundary is not previously observed in MAST Upgrade H-modes, and if such condition can be readily reproduced, it opens a wide range of opportunity for MAST-U to explore low-collisionality peeling-limited pedestal regimes, as well as advanced scenarios such as quiescent H-modes that are relevant to future reactors, such as STEP and ITER.
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