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Validation of IMEP on Alcator C-Mod and JET-ILW ELMy H-mode plasmas

Author(s)
Luda, T.; Angioni, C.; Dunne, M.G.; Fable, E.; Kallenbach, A.; Bonanomi, N.; Schneider, P.A.; Siccinio, M.; Tardini, G.; ASDEX Upgrade Team; EUROfusion MST1 Team; Rodriguez Fernandez, Pablo; Hughes, Jerry W.; Howard, Nathan T.; Alcator C-Mod Team; Frassinetti, L.; Saarelma, S.; JET contributors; ... Show more Show less
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Abstract
The recently developed integrated model based on engineering parameters (IMEP) (Luda et al 2020 Nucl. Fusion 61 126048; Luda et al 2021 Nucl. Fusion 60 036023), so far validated on ASDEX Upgrade, has been tested on a database of 3 Alcator C-Mod and 55 JET-ILW ELMy (type I) H-mode stationary phases. The empirical pedestal transport model included in IMEP, consisting now of imposing a fixed value of R < rTe > =Te;top = -82:5, allows an accurate prediction of the pedestal top temperature (when the pedestal top density is fixed to the experimental measurements) across these three machines with different sizes, when the pedestal is peeling–ballooning (PB) limited. Cases far from the ideal PB boundary, corresponding to high edge Spitzer resistivity, are instead strongly overpredicted by IMEP. A comparison between the predictions of Europed and IMEP for a subset of JET-ILW cases shows that IMEP can more accurately reproduce the experimental pedestal width. This allows IMEP to better capture profile effects on the pedestal stability, and therefore to correctly describe the negative effect of fueling on the pedestal pressure for PB limited cases. A strong correlation between the separatrix density and the fueling rate has been identified for a subset of JET-ILW cases, when taking into account different divertor configurations. Overall, these promising results encourage further developments of integrated models to obtain reliable predictions of pedestal and global confinement using only engineering parameters for present and future machines.
Description
Submitted for publication in Plasma Physics and Controlled Fusion
Date issued
2023-01
URI
https://hdl.handle.net/1721.1/158740
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Plasma Physics and Controlled Fusion
Publisher
IOP
Other identifiers
23ja043

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