Active control of type-I edge-localized modes with n=1 perturbation fields in the JET tokamak.
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(alpha) signal decreased. The energy loss per ELM normalized to the total stored energy, DeltaW/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.
Forschungszentrum Jülich GmbH, Association EURATOM-FZ Jülich, Institut für Plasmaphysik, Trilateral Euregio Cluster, D-52425 Jülich, Germany. y.liang@fz-juelich.de
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Liang
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Koslowski
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Thomas
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Nardon
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Alper
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Andrew
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Andrew
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Arnoux
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Baranov
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Bécoulet
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Beurskens
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Biewer
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Bigi
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Crombe
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De La Luna
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de Vries
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Fundamenski
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Gerasimov
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Giroud
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Gryaznevich
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Hawkes
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Hotchin
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Howell
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Jachmich
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Kiptily
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Moreira
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Parail
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Pinches
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Rachlew
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Zimmermann