Towards the realization on JET of an integrated H-mode scenario for ITER

被引:44
作者
Ongena, J [1 ]
Monier-Garbet, P
Suttrop, W
Andrew, P
Bécoulet, M
Budny, R
Corre, Y
Cordey, G
Dumortier, P
Eich, T
Garzotti, L
Hillis, DL
Hogan, J
Ingesson, LC
Jachmich, S
Joffrin, E
Lang, P
Loarte, A
Lomas, P
Maddison, GP
McDonald, D
Messiaen, A
Nave, MFF
Saibene, G
Sartori, R
Sauter, O
Strachan, JD
Unterberg, B
Valovic, M
Voitsekhovitch, I
von Hellermann, M
Alper, B
Baranov, Y
Beurskens, M
Bonheure, G
Brzozowski, J
Bucalossi, J
Brix, M
Charlet, M
Coffey, I
De Baar, M
De Vries, P
Giroud, C
Gowers, C
Hawkes, N
Jackson, GL
Jupen, C
Kallenbach, A
Koslowski, HR
Lawson, KD
机构
[1] Assoc EURATOM Belgian State, LPP ERM KMS, B-1000 Brussels, Belgium
[2] CEA Cadarache, F-13108 St Paul Les Durance, France
[3] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany
[4] UKAEA Euratom Fus Assoc, Culham, England
[5] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[6] Royal Inst Technol, KTH, Assoc EURATOM VR, Stockholm, Sweden
[7] Forschungszentrum Julich, Inst Plasmaphys, EURATOM Assoc, D-52425 Julich, Germany
[8] Assoc Euratom Enea Fus, Consorzio RFX, I-35127 Padua, Italy
[9] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[10] EURATOM, FOM, Inst Plasmafys, NL-3430 BE Nieuwegein, Netherlands
[11] EFDA Close Support Unit, D-85748 Garching, Germany
[12] Assoc EURATOM IST, Ctr Fusao Nucl, P-1096 Lisbon, Portugal
[13] Ecole Polytech Fed Lausanne, Assoc EURATOM Confederat Suisse, Ctr Rech Phys Plasmas, CH-1007 Lausanne, Switzerland
[14] Chalmers, Assoc EURATOM NFR, S-41296 Gothenburg, Sweden
[15] Univ Aix Marseille 1, PIIM, Equipe Turbulence Plasmas, Marseille, France
[16] DIIID Natl Fus Facil, San Diego, CA 92186 USA
[17] Helsinki Univ Technol, Assoc EURATOM Tekes, Helsinki, Finland
[18] Assoc EURATOM ENEA Fus, Ctr Ric Frascati, I-00044 Frascati, Rome, Italy
[19] Free Univ Brussels, Assoc EURATOM Belgian State, Unite Phys Plasmas, B-1050 Brussels, Belgium
关键词
D O I
10.1088/0029-5515/44/1/015
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
ELMy H-mode experiments at JET in 2000/mid-2002 have focused on discharges with normalized parameters for plasma density, energy confinement and beta similar to those of the ITER Q(DT) = 10 reference regime (n/n(GW) similar to 0.85, H(98(y,2)) similar to 1, beta(N) similar to 1.8). ELMy H-mode plasmas have been realized reaching or even exceeding those parameters in steady-state conditions (up to similar to5 s or 12tau(epsilon)) in a reproducible way and only limited by the duration of the additional heating phase. These results have been obtained (a) in highly triangular plasmas, by increasing the average triangularity delta towards the ITER reference value (delta similar to 0.5), and (b) in plasmas at low triangularity (delta similar to 0.2) by seeding of Ar and placing the X-point of the plasma on the top of the septum. Pellet injection from the high field side is a third method yielding high density and high confinement, albeit not yet under steady-state conditions. In highly triangular plasmas the influence of input power, plasma triangularity and impurity seeding with noble gases has been studied. Density profile peaking at high densities has been obtained in (a) impurity seeded low triangularity discharges, (b) ELMy H-modes with low levels of input power and (c) discharges fuelled with pellet injection from the high field side. New ELM behaviour has been observed in high triangularity discharges at high density, opening a possible route to ELM heat load mitigation, which can be further amplified by Ar impurity seeding. Current extrapolations of the ELM heat load to ITER show possibly a window for Type I ELM operation. Confinement scaling studies indicate an increase in confinement with triangularity and density peaking, and a decrease in confinement with the Greenwald number. In addition, experiments in H isotope and He indicate tau(E) proportional to M(0.19)Z(-0.59). The threshold power for the L-H transition in He plasmas shows the same parametric dependence as in D plasmas, but with a 50% higher absolute value.
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页码:124 / 133
页数:10
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