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Development of forced-cooled superconducting coil for Large Helical Device

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11 Author(s)
Wachi, Y. ; Toshiba Corp., Yokohama, Japan ; Shimada, M. ; Nakamoto, K. ; Shibui, M.
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A force-cooled superconducting coil has been studied for the Large Helical Device (LHD), which will be a main experimental apparatus of the Japanese National Institute for Fusion Science (NIFS). To achieve the main requirements for the LHD, a large-current, high-current-density NbTi cable-in-conduit-type conductor of 10 kA and 47 A/mm2 at 8 T was developed. The test coil was wound in the form of a one-layer solenoid and tested at an operating current of 10 kA in a superposed field of about 7 T, at a hydraulic condition of 1.0 MPa, 4.5 K, and 10 g/s supercritical helium. The stability, normal propagation velocity, and pressure rise during a quench for the high-current-density case were also studied

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