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Design and fabrication of module coil as an R&D program for Large Helical Device

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9 Author(s)
Mito, T. ; Nat. Inst. for Fusion Sci., Nagoya, Japan ; Yamamoto, J. ; Takahata, K. ; Yanagi, N.
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A twisted solenoid coil (TOKI-MC) has been designed and fabricated in order to study the mechanical properties of the Large Helical Device (LHD). One of the most important R&D items of the LHD is the mechanical behavior of the helical coils under a large electromagnetic force. The TOKI-MC was wound obliquely on the 3D-machined elliptical bobbin with a maximum torsional rate of 36°/m at the innermost conductor. The maximum field in the coil is 7.7 T with an operating current of 20 kA, an average current density of 40 A/mm2, and a stored energy of 11 MJ. The TOKI-MC can simulate the electromagnetic force, conductor torsional rate, magnetic field, operating current, and current density of the LHD superconducting helical coils. The design and test results of the conductor and the design and fabrication of the coil are described

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )