The radiated power limit in impurity seeded JET-ILW plasmas

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-10
Department
Department of Applied Physics
Major/Subject
Mcode
Degree programme
Language
en
Pages
7
1-7
Series
Nuclear Materials and Energy, Volume 33
Abstract
The total radiated fraction is examined in high density H-mode plasmas (Greenwald fraction of about 85 %) in JET by the variation of the auxiliary heating power of Pheat = 14 MW-29 MW. An achieved radiation fraction of about 75 % at most has been observed in JET-ILW, which is less than the highest achievable (≈90 %) fraction in JET-C during the high radiative power scenarios with N2 seeding. It is shown that the maximal achievable total radiation fraction averaged over ELM cycles has a strong dependence on the radiation efficiency of the ELM energy, θrad: [Formula presented] About 50 % and 16 % of the ELM induced diamagnetic energy drop (ΔWELM) radiates during the ELM in JET-C and JET-ILW, respectively, which corresponds to the maximum total radiated powers of γrad,JET-Cmax=0.87 and γrad,JET-ILWmax=0.77. These values of the maximum of the radiative power fractions are in good agreement with γradmax experimentally observed in JET-C (90 %) and JET-ILW (75 %).
Description
Funding Information: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. Publisher Copyright: © 2022
Keywords
High radiation plasma scenarios, Impurity, Impurity seeding, JET-ILW
Other note
Citation
Huber, A, Wischmeier, M, Wiesen, S, Bernert, M, Chankin, A V, Aleiferis, S, Brezinsek, S, Huber, V, Sergienko, G, Giroud, C, Groth, M, Jachmich, S, Linsmeier, C, Lomanowski, B, Lowry, C, Matthews, G F, Meigs, A G, Mertens, P, Silburn, S & Telesca, G 2022, ' The radiated power limit in impurity seeded JET-ILW plasmas ', Nuclear Materials and Energy, vol. 33, 101299, pp. 1-7 . https://doi.org/10.1016/j.nme.2022.101299