Development of Benign Elm Scenarios at JET

The development of a Q=10 baseline regime with tolerable ELMs remains a challenging issue for ITER. To address this, the JET programme has focused on the exploration of intrinsically benign ELM plasma scenarios. At high shape and fuelling type I ELM frequencies are strongly reduced by inter-ELM turbulence. Similar turbulence can lead to a fully stationary pedestal at high collisionality in near double-null (ASDEX Upgrade identity) shapes. At higher \textit{$\beta $}$_{p}$ and $q_{95}$ very small ELMs ("Grassy") are seen. JET has now been upgraded with a new divertor to allow more highly shaped plasmas. Preliminary results in the new ITER-like shape show a strong sensitivity of ELM type and confinement to X point location. Further studies using the new divertor to access quasi double-null configurations with increased lower triangularity and decreased upper triangularity have produced the first fully stationary type-II-like regimes with good confinement. Work is now under way to resolve the detailed access requirements and behaviour of benign ELM regimes, testing in particular the role of double-null proximity, collisionality, \textit{$\beta $}$_{p}$ and $q_{95}$. Full results will be reported at conference.