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

0555269 - ÚFP 2022 RIV AT eng J - Článek v odborném periodiku
Frassinetti, L. - Saarelma, S. - Verdoolaege, G. - Groth, M. - Hillesheim, J. - Bílková, Petra - Böhm, Petr - Dunne, M. - Fridström, R. - Giovannozzi, E. - Imbeaux, F. - Labit, B. - De La Luna, E. - Maggi, C. - Owsiak, M. - Scannell, R.
Pedestal structure, stability and scalings in JET-ILW: The EUROfusion JET-ILW pedestal database.
Nuclear Fusion. Roč. 61, č. 1 (2021), č. článku 016001. ISSN 0029-5515. E-ISSN 1741-4326
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: pedestal * JET * tokamak
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.215, rok: 2021
Způsob publikování: Omezený přístup
https://iopscience.iop.org/article/10.1088/1741-4326/abb79e

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.
Trvalý link: http://hdl.handle.net/11104/0329793