Fault analysis and improved design of JET in-vessel Mirnov coils

In vessel Mirnov coils are an essential diagnostic in present day tokamaks. Their use in ITER and future Fusion reactors presents some disadvantages linked to the high radiation environment. Furthermore large Electro Magnetic (EM) forces can be experienced by the coil, due to the pulsed operation of...

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Bibliographic Details
Published in:Fusion engineering and design 2020-01, Vol.150, p.110863, Article 110863
Main Authors: Baruzzo, M., Artaserse, G., Henriques, R.B., Gerasimov, S., Lam, N., Lomas, P.J., Otin, R., Rimini, F., Tsalas, M., Van Boxel, S.
Format: Article
Language:English
Subjects:
Coils
Copper base alloys
Design analysis
Design improvements
Diagnostic systems
Failure analysis
Fusion reactors
Joint European Torus
Long term effects
Nuclear power plants
Organic chemistry
Remote handling
Tokamak devices
Tokamak fusion magnetic sensor Mirnov coil
Vessels
Wire
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Summary:In vessel Mirnov coils are an essential diagnostic in present day tokamaks. Their use in ITER and future Fusion reactors presents some disadvantages linked to the high radiation environment. Furthermore large Electro Magnetic (EM) forces can be experienced by the coil, due to the pulsed operation of the tokamak device (Van Nieuwenhove and Vermeeren, 2003, Vayakis et al., 2011 [1,2]), and disruptions (Gerasimov et al., 2015 [3]). Since the operation with the ITER-like wall, JET has experienced severe faults in the high-bandwidth Ti wire coils. During 2016-17 new coils have been designed and installed. These can be replaced using remote handling, and they use Cu alloy wire. The presented work includes the failure analysis and modelling, motivating the design differences between old and new coils. The latter will provide valuable information on the long term effects of EM loads during disruptions, as well as chemical degradation processes that will be encountered for ITER High Frequency (HF) coils, which are characterized by the same materials.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2019.02.123