Hybrid H-mode scenario with nitrogen seeding and type III ELMs in JET

被引：14

作者：

Corre, Y. ^{[1
]}

Joffrin, E. ^{[1
]}

Monier-Garbet, P. ^{[1
]}

Andrew, Y. ^{[2
]}

Arnoux, G. ^{[1
]}

Beurskens, M. ^{[2
]}

Brezinsek, S. ^{[3
]}

Brix, M. ^{[2
]}

Buttery, R. ^{[2
]}

Coffey, I. ^{[4
]}

Crombe, K. ^{[5
]}

de La Luna, E.

Felton, R. ^{[2
]}

Giroud, C. ^{[2
]}

Hacquin, S. ^{[1
]}

Hobirk, J. ^{[6
]}

Huber, A. ^{[3
]}

Imbeaux, F. ^{[1
]}

Jachmich, S. ^{[7
]}

Kempenaars, M. ^{[2
]}

Litaudon, X. ^{[1
]}

Leggate, H. ^{[2
]}

Loarer, T. ^{[1
]}

Maddison, G. ^{[2
]}

Rachlew, E. ^{[8
]}

Rapp, J. ^{[3
,9
]}

Sauter, O. ^{[10
]}

Savchkov, A. ^{[2
]}

Telesca, G. ^{[3
]}

Widdowson, A. ^{[3
]}

Zastrow, K. D. ^{[2
]}

Zimmermann, O. ^{[3
]}

机构：

[1] CEA, IRFM, F-13108 St Paul Les Durance, France

[2] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[3] Forschungszentrum Julich, Assoc EURATOM FZJ,Trilateral Euregio Cluster, Inst Energieforsch Plasmaphy, Julich, Germany

[4] Queens Univ Belfast, Belfast BT7 1NN, Antrim, North Ireland

[5] Univ Ghent, Dept Appl Phys, B-9000 Ghent, Belgium

[6] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

[7] Assoc EURATOM Belgian State, KMS ERM, B-1000 Brussels, Belgium

[8] KTH Royal Inst Technol, Assoc EURATOM VR, SE-10691 Stockholm, Sweden

[9] EURATOM, FOM, Inst Plasmafys Rijnhuizen, Trilateral Euregio Cluster, Nieuwegein, Netherlands

[10] Ecole Polytech Fed Lausanne, CRPP, Assoc Euratom Confederat Suisse, CH-1015 Lausanne, Switzerland

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2008年 / 50卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0741-3335/50/11/115012

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The performance of the 'hybrid' H-mode regime (long pulse operation with high neutron fluency) has been extensively investigated in JET during the 2005-2007 experimental campaign up to normalized pressure beta(N) = 3, toroidal magnetic field B-t = 1.7T, with type I ELMs plasma edge conditions. The optimized external current drive sources, self-generated non-inductive bootstrap current and plasma core stability properties provide a good prospect of achieving a high fusion gain at reduced plasma current for long durations in ITER. One of the remaining issues is the erosion of the divertor target plates associated with the type I ELM regime. A possible solution could be to operate with a plasma edge in the type III ELM regime (reduced transient and stationary heat loads) obtained with impurity seeding. An integrated hybrid type III ELM regime with a normalized pressure beta(N) = 2.6 (PNBI similar to 20-22 MW) and a thermal confinement factor of H-98* 98(y, 2) similar to 0.83 has been recently successfully developed on JET with nitrogen seeding. This scenario shows good plasma edge condition (compatible with the future ITER-like wall on JET) and moderate MHD activity. In this paper, we report on the experimental development of the scenario (with plasma current I-p = 1.7MA and magnetic field B-t = 1.7T) and the trade-off between heat load reduction at the target plates and global confinement due to nitrogen seeding and type III ELM working conditions.

引用

页数：20

共 42 条

[1] Improved charge exchange spectroscopy on the Joint European Torus for ion temperature and rotation velocity profiles [J].