Understanding JET-C quiescent phases with edge harmonic magnetohydrodynamic activity and comparison with behaviour under ITER-like wall conditioning

Brunetti, D.; Ham, Christopher; Graves, J. P.; Lazzaro, E.; Nowak, S.; Mariani, A.; Wahlberg, Christer; Cooper, W. A.; Solano, E.R.; Saarelma, S.; Frassinetti, L.; Fontana, M.; Kleiner, Andreas; Ramirez, Guillermo Bustos; Viezzer, E.

doi:10.1088/1361-6587/ac4d3a

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“…The ballooning stability of these two saturated instabilities is discussed in section 5. The QH-mode in JET has also been investigated with particular focus on the impact of collisionality [16]. A model for grassy ELMs has been investigated using a gyrofluid model implemented in the BOUT++ framework.…”

Section: Recent Work On Reactor Relevant Pedestalsmentioning

confidence: 99%

Towards understanding reactor relevant tokamak pedestals

et al. 2021

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The physics of the tokamak pedestal is still not fully understood, for example there is no fully predictive model for the pedestal height and width. However, the pedestal is key in determining the fusion power for a given scenario. If we can improve our understanding of reactor relevant pedestals we will improve our confidence in designing potential fusion power plants. Work has been carried out as part of a collaboration on reactor relevant pedestal physics. We report some of the results in detail here and review some of the wider work which will be reported in full elsewhere. First, we attempt to use a gyrokinetic-based calculation to eliminate the pedestal top density as a model input for Europed/EPED pedestal predictions. We assume power balance at the top of the pedestal, that is, the heat flux crossing the separatrix must be equal to the heat source at the top of the pedestal and investigate the consequences of this assumption. Unfortunately, this method was not successful. Second, we investigate the effects of non flux surface density on the bootstrap current. Third, type I ELMs will not be tolerable for a reactor relevant regime due to the damage that they are expected to cause to plasma facing components. In recent years various methods of running tokamak plasmas without large ELMs have been developed. These include small and no ELM regimes, the use of resonant magnetic perturbations and the use of vertical kicks. We discuss the quiescent H-mode here. Finally we give a summary and directions for future work.

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Section: Recent Work On Reactor Relevant Pedestalsmentioning

confidence: 99%