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Electromagnetic and mechanical characterisation of ITER CS-MC conductors affected by transverse cyclic loading. II. Interstrand contact resistances

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5 Author(s)
Nijhuis, A. ; Fac. for Appl. Phys., Twente Univ., Enschede, Netherlands ; Noordman, N.H.W. ; ten Kate, H.J. ; Mitchell, N.
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A special cryogenic press has been built to study the mechanical and electrical properties of full-size ITER multistrand Nb/sub 3/Sn cable-in-conduit conductor samples under transverse, mechanical loading. This simulates the transverse magnetic force that occurs when the conductors are used in a coil. The cryogenic press can transmit a variable (cyclic) force up to 650 kN/m to a cable section of 400 mm length at 4.2 K. The jacket is opened partly in order to transmit the force directly onto the table. The various interstrand contact resistances (R/sub c/s) between strands selected from sub-cables at different positions inside the cable are measured. A summary of the results obtained with up to several tens of full loading cycles is presented. The cables consist of six last stage sub-cables (petals) which are wrapped with an Inconel 600 ribbon. A significant increase of the intra-petal R/sub c/ after several cycles is observed. An opposite effect is noticed for the inter-petal R/sub c/. Upon applying a load of 650 kN/m, the R/sub c/ drops for the intra-petal as well as for the inter-petal resistance with respect to zero load.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )