ITER In Vessel Coil Design and R&D
Authors: M. Kalish, et. al.
Abstract:
ITER will incorporate In Vessel Coils (IVCs) as a
method of stabilizing "Edge Localized Modes" (ELM) and
providing "Vertical Stabilization" (VS). To meet the ELM and
VS Coil requirements strong coupling with the plasma is
required so that it is necessary for the coils to be installed in the
vessel just behind the blanket shield modules. Due to this close
proximity to the plasma the radiation and temperature
environment is severe and conventional electrical insulation
materials and processes cannot be used. The development of
mineral insulated conductor technology has been required in the
IVC design to deal with this high radiation and high temperature
environment. While mineral insulated conductor technology is
not new, building a large magnet with high current carrying
capability and a conductor diameter larger than the mineral
insulated conductor currently manufactured requires R&D and
the extension of existing technologies. A 59mm Stainless Steel
Jacketed Mineral Insulated Conductor (SSMIC) using MgO is
being developed for this application. The IVC ELM and VS coils
design includes both the development of the fabrication
techniques for the SSMIC and the design and analysis of the
ELM and VS Coil assemblies.
The ELM coil assemblies consist of nine toroidal sectors of three
(upper, midplane, and lower) 6-turn rectangular "picture frame
coils" for a total of 27 coils mounted to the vacuum vessel. The
ELM coil structural design must provide enough flexibility to
relieve the thermal stresses in the coil while providing the
stiffness to resist the high Lorentz (magnetic) loads on the coil. To
achieve the required fatigue lifetime the ELM SSMIC conductors
use a water cooled CuCrZr conductor. The VS coils consist of one
upper and one lower 4-turn solenoid "ring" coil connected in an
anti-series "saddle" arrangement. Because it is less stressed than
the ELM coil conductor the VS SSMIC conductor use water
cooled Cu instead of CuCrZr.
This paper summarizes the design, development, and testing to
date of the SSMIC conductor as well as the design and analysis of
the VS and ELM coil assemblies. Joining and assembly
techniques for the SSMIC conductor are also discussed.
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Submitted to: 38th International Conference on Plasma Science & 24th Symposium on Fusion Engineering/ICOPS 2011 SOFE, Chicago, IL, June 26-30, 2011
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