Recent progress on JET towards the ITER reference mode of operation at high density

被引：0

作者：

Ongena, J. ^{[1
]}

Suttrop, W. ^{[2
]}

Bécoulet, M. ^{[3
]}

Cordey, G. ^{[4
]}

Dumortier, P. ^{[1
]}

Eich, Th. ^{[5
]}

Ingesson, L.C. ^{[6
]}

Jachmich, S. ^{[1
]}

Lang, P. ^{[5
]}

Loarte, A. ^{[7
]}

Lomas, P. ^{[4
]}

Maddison, G.P. ^{[4
]}

Messiaen, A. ^{[1
]}

Nave, M.F.F. ^{[8
]}

Rapp, J. ^{[5
]}

Saibene, G. ^{[7
]}

Sartori, R. ^{[7
]}

Sauter, O. ^{[9
]}

Strachan, J.D. ^{[10
]}

Unterberg, B. ^{[5
]}

Valovic, M. ^{[4
]}

Alper, B. ^{[4
]}

Andrew, Ph. ^{[4
]}

Baranov, Y. ^{[4
]}

Brzozowski, J. ^{[10
]}

Bucalossi, J. ^{[3
]}

Brix, M. ^{[5
]}

Budny, R. ^{[11
]}

Charlet, M. ^{[4
]}

Coffey, I. ^{[4
]}

De Baar, M. ^{[6
]}

De Vries, P. ^{[6
]}

Gowers, C. ^{[4
]}

Hawkes, N. ^{[4
]}

Von Hellermann, M. ^{[6
]}

Hillis, D.L. ^{[12
]}

Hogan, J. ^{[12
]}

Jackson, G.L. ^{[13
]}

Joffrin, E. ^{[3
]}

Jupen, C. ^{[10
]}

Kallenbach, A. ^{[2
]}

Koslowski, H.R. ^{[5
]}

Lawson, K.D. ^{[4
]}

Mantsinen, M. ^{[4
]}

Matthews, G. ^{[4
]}

Monier-Garbet, P. ^{[3
]}

McDonald, D. ^{[4
]}

Milani, F. ^{[4
]}

Murakami, M. ^{[12
,13
]}

Murari, A. ^{[14
]}

机构：

[1] LPP/ERM-KMS, Association EURATOM-Belgian State, B-1000 Brussels, Belgium

[2] Max-Planck Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany

[3] CEA Cadarache, F-13108 St. Paul lez Durance, France

[4] EURATOM/UKAEA Fusion Association, Culham, United Kingdom

[5] Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, D-52425 Jülich, Germany

[6] FOM-Instituut voor Plasmafysica, EURATOM Association, Postbus 1207, NL-3430 BE Nieuwegein, Netherlands

[7] EFDA-Close Support Unit, D-85748 Garching, Germany

[8] Centro de Fusão Nuclear, Association 'EURATOM-IST', 1096 Lisbon, Portugal

[9] Centre de Recherches en Physique des Plasmas, Ecole Polytechnique de Lausanne, Association 'EURATOM-Confederation Suisse', Lausanne, Switzerland

[10] Chalmers University of Technology, Association 'EURATOM-NFR', Göteborg, Sweden

[11] Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, United States

[12] Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States

[13] DIII-D National Fusion Facility, San Diego, CA 92186-5698, United States

[14] Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Frascati, C.P. 65, 00044-Frascati, Rome, Italy

[15] Consorzio RFX - Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy

[16] Université Libre de Bruxelles, Association 'EURATOM-Belgian State', Physique Théorique et Mathématique, Unité de Physique des Plasmas, 1050 Brussels, Belgium

来源：

Plasma Physics and Controlled Fusion | 2001年 / 43卷 / 12 A期

关键词：

Gases - Impurities - Magnetohydrodynamics - Optimization - Plasma confinement - Plasma density - Plasma stability;

D O I：

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学科分类号：

摘要：

Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H98(y,2) = 1 and densities up to n/nGW ∼ 1 are now routinely obtained. This has been possible (i) by using plasmas at high (δ ∼ 0.5) and medium (δ ∼ 0.3-0.4) triangularity with sufficient heating power to maintain Type I ELMs, (ii) with impurity seeded plasmas at high (δ ∼ 0.5) and low (δ &le 0.2) triangularity, (iii) with an optimized pellet injection sequence, maintaining the energy confinement and raising the density, and (iv) by carefully tuning the gas puff rate leading to plasmas with peaked density profiles and good confinement at long time scales. These high performance discharges exhibit Type I ELMs, with a new and more favourable behaviour observed at high densities, requiring further studies. Techniques for a possible mitigation of these ELMs are discussed, and first promising results are obtained with impurity seeding in discharges at high triangularity. Scaling studies using the new data of this year show a strong dependence of confinement on upper triangularity, density and proximity to the Greenwald limit. Observed MHD instabilities and methods to avoid these in high density and high confinement plasmas are discussed.

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