Active Control of Type-I Edge-Localized Modes with n=1 Perturbation Fields in the JET Tokamak

Journal Article · Fri Jun 29 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.265004· OSTI ID:20953375

Liang, Y; Koslowski, H R; Zimmermann, O ^[1]; Thomas, P R; Nardon, E; Arnoux, G; Becoulet, M ^[2]; Alper, B; Andrew, P; Andrew, Y; Baranov, Y; Beurskens, M; Vries, P de; Fundamenski, W; Gerasimov, S; Giroud, C; Gryaznevich, M P; Hawkes, N; Hotchin, S; Howell, D ^[3]

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1. Forschungszentrum Juelich GmbH, Association EURATOM-FZ Juelich, Institut fuer Plasmaphysik, Trilateral Euregio Cluster, D-52425 Juelich (Germany)
2. Association EURATOM-CEA, 13108 St Paul-lez-Durance (France)
3. EURATOM-UKAEA Fusion Association, Culham Science Centre, OX14 3DB, Abingdon, OXON (United Kingdom)

Type-I edge-localized modes (ELMs) have been mitigated at the JET tokamak using a static external n=1 perturbation field generated by four error field correction coils located far from the plasma. During the application of the n=1 field the ELM frequency increased by a factor of 4 and the amplitude of the D{sub {alpha}} signal decreased. The energy loss per ELM normalized to the total stored energy, {delta}W/W, dropped to values below 2%. Transport analyses shows no or only a moderate (up to 20%) degradation of energy confinement time during the ELM mitigation phase.

• OSTI ID: 20953375
• Journal Information: Physical Review Letters, Vol. 98, Issue 26; Other Information: DOI: 10.1103/PhysRevLett.98.265004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONFINEMENT TIME
EDGE LOCALIZED MODES
ENERGY LOSSES
JET TOKAMAK
PERTURBATION THEORY
PLASMA
SIGNALS
STORED ENERGY