Pedestal structure, stability and scalings in JET-ILW: The EUROfusion JET-ILW pedestal database

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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
50
Series
Nuclear Fusion, Volume 61, issue 1
Abstract
The EUROfusion JET-ILW pedestal database is described, with emphasis on three main issues. First, the technical aspects are introduced, including a description of the data selection, the datasets, the diagnostics used, the experimental and theoretical methods implemented and the main definitions. Second, the JET-ILW pedestal structure and stability are described. In particular, the work describes the links between the engineering parameters (power, gas and divertor configuration) and the disagreement with the peeling-ballooning (PB) model implemented with ideal magnetohydrodynamics equations. Specifically, the work clarifies why the JET-ILW pedestal tends to be far from the PB boundary at high gas and high power, showing that a universal threshold in power and gas cannot be found but that the relative shift (the distance between the position of the pedestal density and of the pedestal temperature) plays a key role. These links are then used to achieve an empirical explanation of the behavior of the JET-ILW pedestal pressure with gas, power and divertor configuration. Third, the pedestal database is used to revise the scaling law of the pedestal stored energy. The work shows a reasonable agreement with the earlier Cordey scaling in terms of plasma current and triangularity dependence, but highlights some differences in terms of power and isotope mass dependence.
Description
| openaire: EC/H2020/633053/EU//EUROfusion
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Citation
Frassinetti, L, Saarelma, S, Verdoolaege, G, Groth, M, Hillesheim, J C, Bilkova, P, Bohm, P, Dunne, M, Fridström, R, Giovannozzi, E, Imbeaux, F, Labit, B, De La Luna, E, Maggi, C, Owsiak, M, Scannell, R & JET Contributors 2021, ' Pedestal structure, stability and scalings in JET-ILW : The EUROfusion JET-ILW pedestal database ', Nuclear Fusion, vol. 61, no. 1, 016001 . https://doi.org/10.1088/1741-4326/abb79e