The radiated power limit in impurity seeded JET-ILW plasmas

A. Huber; M. Wischmeier; S. Wiesen; M. Bernert; A. V. Chankin; S. Aleiferis; S. Brezinsek; V. Huber; G. Sergienko; C. Giroud; M. Groth; S. Jachmich; Ch Linsmeier; B. Lomanowski; C. Lowry; G. F. Matthews; A. G. Meigs; Ph Mertens; S. Silburn; G. Telesca

doi:10.1016/j.nme.2022.101299

The radiated power limit in impurity seeded JET-ILW plasmas

A. Huber^*, M. Wischmeier, S. Wiesen, M. Bernert, A. V. Chankin, S. Aleiferis, S. Brezinsek, V. Huber, G. Sergienko, C. Giroud, M. Groth, S. Jachmich, Ch Linsmeier, B. Lomanowski, C. Lowry, G. F. Matthews, A. G. Meigs, Ph Mertens, S. Silburn, G. Telesca

^*Corresponding author for this work

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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 P_heat = 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, θ_rad: [Formula presented] About 50 % and 16 % of the ELM induced diamagnetic energy drop (ΔW_ELM) radiates during the ELM in JET-C and JET-ILW, respectively, which corresponds to the maximum total radiated powers of γ_rad,JET-C^max=0.87 and γ_rad,JET-ILW^max=0.77. These values of the maximum of the radiative power fractions are in good agreement with γ_rad^max experimentally observed in JET-C (90 %) and JET-ILW (75 %).

Original language	English
Article number	101299
Pages (from-to)	1-7
Number of pages	7
Journal	Nuclear Materials and Energy
Volume	33
DOIs	https://doi.org/10.1016/j.nme.2022.101299
Publication status	Published - Oct 2022
MoE publication type	A1 Journal article-refereed

Keywords

High radiation plasma scenarios
Impurity
Impurity seeding
JET-ILW

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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, 33, 1-7. Article 101299. https://doi.org/10.1016/j.nme.2022.101299

@article{edc0a670b3c0498d976fd74e45e4595d,

title = "The radiated power limit in impurity seeded JET-ILW plasmas",

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 %).",

keywords = "High radiation plasma scenarios, Impurity, Impurity seeding, JET-ILW",

author = "A. Huber and M. Wischmeier and S. Wiesen and M. Bernert and Chankin, {A. V.} and S. Aleiferis and S. Brezinsek and V. Huber and G. Sergienko and C. Giroud and M. Groth and S. Jachmich and Ch Linsmeier and B. Lomanowski and C. Lowry and Matthews, {G. F.} and Meigs, {A. G.} and Ph Mertens and S. Silburn and G. Telesca",

note = "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: {\textcopyright} 2022",

year = "2022",

month = oct,

doi = "10.1016/j.nme.2022.101299",

language = "English",

volume = "33",

pages = "1--7",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

Huber, A, Wischmeier, M, Wiesen, S, Bernert, M, Chankin, AV, Aleiferis, S, Brezinsek, S, Huber, V, Sergienko, G, Giroud, C, Groth, M, Jachmich, S, Linsmeier, C, Lomanowski, B, Lowry, C, Matthews, GF, Meigs, AG, 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

TY - JOUR

T1 - The radiated power limit in impurity seeded JET-ILW plasmas

AU - Huber, A.

AU - Wischmeier, M.

AU - Wiesen, S.

AU - Bernert, M.

AU - Chankin, A. V.

AU - Aleiferis, S.

AU - Brezinsek, S.

AU - Huber, V.

AU - Sergienko, G.

AU - Giroud, C.

AU - Groth, M.

AU - Jachmich, S.

AU - Linsmeier, Ch

AU - Lomanowski, B.

AU - Lowry, C.

AU - Matthews, G. F.

AU - Meigs, A. G.

AU - Mertens, Ph

AU - Silburn, S.

AU - Telesca, G.

N1 - 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

PY - 2022/10

Y1 - 2022/10

N2 - 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 %).

AB - 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 %).

KW - High radiation plasma scenarios

KW - Impurity

KW - Impurity seeding

KW - JET-ILW

UR - http://www.scopus.com/inward/record.url?scp=85141478463&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2022.101299

DO - 10.1016/j.nme.2022.101299

M3 - Article

AN - SCOPUS:85141478463

SN - 2352-1791

VL - 33

SP - 1

EP - 7

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101299

ER -

The radiated power limit in impurity seeded JET-ILW plasmas

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