Abstract
The aim of the development of DPC-EX is to demonstrate the applicability of an Nb 3Sn conductor to pulsed coils for tokamak fusion machines. The DPC-EX, whose inner diameter is 1 m, consists of two double pancakes fabricated by a react-and-wind technique. The conductor is a forced cooled, flat, cable-in-conduit conductor. The DPC-EX has been installed between two Nb-Ti demo poloidal coils (DPC-U1 and U2). In the series operating mode (DPC-EX, DPC-U1 and U2), DPC-EX was ramped up to 17 kA in 1 s and ramped down to zero in 1 s after a flat top time for 1 s, without normal transition. The maximum magnetic field and the maximum pulse field were 6.7 T and 6.7 T s −1, respectively. The current density in the winding was 37.2 A mm −2 at an operating current of 17 kA. The ratio of a.c. losses to the stored energy was ≈ 0.14% during pulsed operation. After more than 50 cycles of pulsed operation, no damage could be found in the DPC-EX. The stability test indicates that DPC-EX has a high stability margin. These results demonstrate the possibility of high field (12–14 T) poloidal coils, as required in the FER and ITER.
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