Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

The performance of two mass-produced Nb3Sn conductors
for the ITER central solenoids was tested for the first time.
One was cut from the forward end of an 80-m-long conductor,
and the other was cut from the forward end of a 918-m-long
conductor. The fifth-stage twist pitches of these conductors were
lengthened by approximately 16% during cable insertion and
compaction with conduit. The current sharing temperatures Tcs
were measured over 20 000 electromagnetic cycles, including four
thermal cycles between 4.2 K and room temperature. The Tcs
of the former conductor increased and became almost constant
through the cycling. In contrast, Tcs of the latter conductor not
only increased but also decreased slightly against cycling. The Tcs
decline rate after 10 002 cycles was −4.50 × 10−6 K/cycle. If this
rate is assumed to continue after 20 000 cycles, Tcs would decrease
by −0.27 K over 60 000 cycles. Even so, Tcs is higher than an
acceptance criterion of 6.5 K at 60 000 cycles. The ac losses Q
of both conductors at a current of 0 kA were almost the same
as or slightly lower than Q of a short sample conductor whose
fifth-stage twist pitch was not lengthen. On each conductor, Q at
40 kA was approximately 10% higher than that at 0 kA; thus, the
effect of the transport current on Q was not large.

書誌情報

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY

巻 26, 号 4, p. 4200705-1-4200705-5, 発行日 2017-03

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TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY

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2023-05-15 18:00:33.767106

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