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  4. Examination of Japanese Mass-Produced Nb3Sn Conductors for ITER Toroidal Field Coils
 
conference paper

Examination of Japanese Mass-Produced Nb3Sn Conductors for ITER Toroidal Field Coils

Nabara, Y.
•
Nunoya, Y.
•
Isono, T.
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2012
IEEE Transactions On Applied Superconductivity
22nd International Conference on Magnet Technology (MT)

The performances of six Nb3Sn conductors for the ITER Toroidal Field coils were tested. Four of them showed similar degradation rates of their current sharing temperatures T-cs over 1,000 electromagnetic cycles. By contrast, two of them showed sharp T-cs degradations at 50 cycles, after which their slopes became similar to those of the other four conductors. These two cables seemed to shrink under high magnetic fields during the first 50 cycles, which caused the sharp T-cs degradation. This shrinkage might arise from a decline in cable rigidity due to, for example, the deformation of strands or the breakage of the Nb3Sn filaments. The four mass-produced conductors had roughly the same AC loss before cycling. After 1,000 cycles, the AC losses of all the conductors decreased markedly to less than half of those before cycling, and the values became approximately the same. After the test campaign, the destructive inspection of two of the conductors made it clear that the conductor had shrunk by about 520 ppm under the high magnetic field during the test. It was also clarified that some strands were visibly deformed under the high magnetic field, whereas those under the low magnetic field did not look distorted. This plastic deformation of the strands could be one of the major reasons for the T-cs degradation with cyclic operation.

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Type
conference paper
DOI
10.1109/Tasc.2011.2178990
Web of Science ID

WOS:000307364700277

Author(s)
Nabara, Y.
Nunoya, Y.
Isono, T.
Hamada, K.
Takahashi, Y.
Matsui, K.
Hemmi, T.
Kawano, K.
Koizumi, N.
Ebisawa, N.
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Date Issued

2012

Publisher

IEEE-Inst Electrical Electronics Engineers Inc

Publisher place

Piscataway

Published in
IEEE Transactions On Applied Superconductivity
Total of pages

4

Volume

22

Issue

3

Start page

4804804

Subjects

Fusion reactors

•

multifilamentary superconductors

•

superconducting coils

•

toroidal magnetic fields

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Event nameEvent placeEvent date
22nd International Conference on Magnet Technology (MT)

Marseille

September 12-16, 2011

Available on Infoscience
February 27, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/89798
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