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- W2188401861 abstract "It is well-known that the edge plasma parameters influence plasma performance in many different ways. In the ELMy H-mode, which is considered a reference scenario for ITER and other burning plasma experiments, the link between edge and cor e is controlled by the edge transport barrier (ETB), a thin l ayer o f improved trans port characteristics. Conventionally, the plasma core and scrape-off layer have been treated separately in predictive modelling with the motivation that the physics is very different in these two regions. Moreover, in many studies modelling of the plasma has not included simulation of the ETB and the scrape-off layer. Instead, the values of the relevant plasma parameters on top of the ETB have been used as boundary conditions. However, both theory and experiments show that there is a strong link between the edge and the core, so that even a modest variation of the plasma parameters in one region can lead to a dramatic change in overall plasma performance. Therefore, integrated modelling of both core and edge is needed in order to obtain self-consistent results. In this study, integrated predicted modelling of ELMy H-mode JET plasmas is performed using a suite of JET transport codes. Core modelling is done with th e 1.5D transport code JETTO [1], whose output is linked to the MHD stability codes IDBALL, HELENA and MISHKA [2]. The edge transport code EDGE2D/NIMBUS [3] is used for 2D modelling of the scrape-off layer. Finally, both core and e dge are modelled self-consistently using COCONUT, a coupling of EDGE2D and JETTO. The coupled runs also give self-consistent boundary conditions for the JETTO runs on which MHD stability analysis is performed. 2. Integrated predictive modelling The sensitive dep endence of plasma performance on the edge parameters is v ery well demonstrated in experiments with external gas fuelling in type I ELMy H-mode plasma [4]. It is known = 3 22 s -1 in the case of JET. Higher levels of gas puffing can trigger a transition from type I to type III ELMs with a drama tic increase in the ELM frequency followed by a deterioration of plasma confinement. As will be shown, these experimental observations can be explained by predictive simulations." @default.
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- W2188401861 date "2002-01-01" @default.
- W2188401861 modified "2023-09-26" @default.
- W2188401861 title "Integrated Predictive Transport Modelling of ELMy H-Mode JET Plasmas" @default.
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