Performance assessment and optimization of the ITER toroidal field coil joints

The ITER toroidal field (TF) system features eighteen coils that will provide the magnetic field necessary to confine the plasma. Each winding pack is composed of seven double pancakes (DP) connected through praying hands joints. Shaking hands joints are used to interface the terminals of the conduc...

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Bibliographic Details
Published in:Superconductor science & technology 2013-08, Vol.26 (8), p.85004-14
Main Authors: Rolando, G, Foussat, A, Knaster, J, Ilin, Y, Nijhuis, A
Format: Article
Language:English
Subjects:
Buses (vehicles)
Coils
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductors (devices)
Exact sciences and technology
Joining
Magnetic fields
Magnetic properties and materials
Optimization
Physics
Studies of specific magnetic materials
Superconductors
Terminals
Winding
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Summary:The ITER toroidal field (TF) system features eighteen coils that will provide the magnetic field necessary to confine the plasma. Each winding pack is composed of seven double pancakes (DP) connected through praying hands joints. Shaking hands joints are used to interface the terminals of the conductor with the feeder and inter-coil U-shaped bus bars. The feasibility of operating plasma scenarios depends on the ability of the magnets to retain sufficient temperature and current margins. In this respect, the joints represent a possible critical region due to the combination of steady state Joule heating in the resistance of the joint and coupling losses and currents in ramped operation. The temperature and current margins of both DP and terminal joints are analysed during the 15 and 17 MA plasma scenarios. The effect on the joint performance of feasible optimization solutions, such as rotation of the terminal joints and sole RRR increase, is explored. The characterization of the TF coil joints is completed by the estimation of the coupling loss time constant for different inter-strand and strand-to-joint resistance values. The study is carried out with the code JackPot-ACDC, allowing the analysis of lap-type joints with a strand-level detail.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/26/8/085004