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.
Liang
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Y
Forschungszentrum Jülich GmbH, Association EURATOM-FZ Jülich, Institut für Plasmaphysik, Trilateral Euregio Cluster, D-52425 Jülich, Germany. y.liang@fz-juelich.de
Koslowski
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HR
Thomas
P R
PR
Nardon
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E
Alper
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B
Andrew
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P
Andrew
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Y
Arnoux
G
G
Baranov
Y
Y
Bécoulet
M
M
Beurskens
M
M
Biewer
T
T
Bigi
M
M
Crombe
K
K
De La Luna
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E
de Vries
P
P
Fundamenski
W
W
Gerasimov
S
S
Giroud
C
C
Gryaznevich
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MP
Hawkes
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N
Hotchin
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S
Howell
D
D
Jachmich
S
S
Kiptily
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V
Moreira
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L
Parail
V
V
Pinches
S D
SD
Rachlew
E
E
Zimmermann
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O