Investigation of H-mode density limit in mixed protium-deuterium plasmas at JET with ITER-like wall

被引：0

作者：

Huber, A. ^{[1
]}

Sergienko, G. ^{[1
]}

Groth, M. ^{[2
]}

Keeling, D. ^{[3
]}

Wischmeier, M. ^{[4
]}

Douai, D. ^{[5
]}

Lerche, E. ^{[6
]}

von Thun, C. Perez ^{[7
]}

Brezinsek, S. ^{[1
]}

Huber, V. ^{[3
]}

Boboc, A. ^{[3
]}

Brix, M.

Carvalho, I. S. ^{[8
,9
]}

Chankin, A. V. ^{[4
]}

Delabie, E. ^{[10
]}

Jepu, I. ^{[3
]}

Kachkanov, V. ^{[3
]}

Kiptily, V. ^{[3
]}

Kirov, K. ^{[3
]}

Linsmeier, Ch. ^{[1
]}

Litherland-Smith, E. ^{[3
]}

Lowry, C. G. ^{[11
,12
]}

Maggi, C. F. ^{[3
]}

Mailloux, J. ^{[3
]}

Meigs, A. G. ^{[3
]}

Mertens, Ph.

Poradzinski, M. ^{[3
,13
]}

Zastrow, K. -d. ^{[3
]}

Zlobinski, M. ^{[1
]}

Contributors, Jet

机构：

[1] Forschungszentrum Julich GmbH, Inst Energie & Klimforsch Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany

[2] Aalto Univ, Espoo, Finland

[3] Culham Sci Ctr, CCFE, Abingdon OX14 3DB, England

[4] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[5] CEA, IRFM, Assoc Euratom CEA, F-13108 St Paul Les Durance, France

[6] TEC Partner, Assoc EUROFUS Belgian State, LPP ERM, KMS, Brussels, Belgium

[7] Inst Plasma Phys & Laser Microfus IPPLM, PL-00908 Warsaw, Poland

[8] Forschungszentrum Julich GmbH, Julich Supercomp Ctr, D-52425 Julich, Germany

[9] Univ Lisbon, Inst Super Tecn, Inst Plasmas & Fusao Nucl, Lisbon, Portugal

[10] Oak Ridge Natl Lab, Oak Ridge, TN USA

[11] Culham Sci Ctr, JET Exploitat Unit, Abingdon OX14 3DB, England

[12] European Commiss, B-1049 Brussels, Belgium

[13] Inst Plasma Phys & Laser Microfus, Hery 23 St, PL-01497 Warsaw, Poland

来源：

NUCLEAR MATERIALS AND ENERGY | 2024年 / 41卷

关键词：

Density limit; H; -mode; Detachment; Greenwald fraction; JET; ILW; DIVERTOR; EDGE; HYDROGEN;

D O I：

10.1016/j.nme.2024.101806

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Analysis of comparable discharges fuelled by either deuterium or protium reveals a clear relationship between the isotope mass and the H-mode density limit. Notably, the density limit is significantly lower in protium, showing a reduction of up to 35 % compared to identical deuterium plasma conditions. Within mixed H-mode density limit (HDL) plasmas, the maximum achievable density, or H-mode density limit, decreases with increasing protium concentration, denoted as cH. For instance, the highest corresponding maximum Greenwald fraction (fGW) of about 1.02 was observed in the pulse with the lowest cH value of 4.4 %. This fGW decreases to 0.96 at cH = 48 %. The average atomic mass, A, of the plasma species decreases in these pulses from the value of 1.96 (cH = 4.4%) down to 1.52 (cH = 48 %). Interestingly, the maximum achievable density appears to be largely unaffected by the applied power value, regardless of whether deuterium or protium is used, as well as under mixed H/D fuelling conditions. Additionally, the measured Greenwald fractions are agreed with a heuristic model based on the SOL pressure threshold of an MHD instability, as proposed by Goldston. This comparison, especially concerning the model's dependence on isotopic mass, shows full consistency between the measured and predicted Greenwald fractions.

引用

页数：8

共 31 条

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