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In Situ T_{c} Measurements of Cable in Conduit Conductors via an Inductive Method

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6 Author(s)
Calzolaio, C. ; Fusion Technol., EPFL-CRPP, Villigen, Switzerland ; Bruzzone, P. ; Uglietti, D. ; Stepanov, B.
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The measurement of the actual thermal strain, , in a cable in conduit conductor (CICC) of is of paramount importance to predict the CICC performance in operation starting from the strand scaling laws for the critical current density . The behavior of the critical temperature as a function of the axial strain at constant field, , is known from the literature and is accurately described by interpolative scaling laws. In the scope of this work, the critical temperature as a function of the applied field, , is measured for the CICC in-situ and for the free standing filaments used for the cable manufacture. These results are compared with the curve to draw the thermal strain in the CICC. A small AC field is generated at the sample and its inductive response is recorded. At the superconducting transition the change from a diamagnetic to a paramagnetic response is observed. The experimental assessment of the in a CICC through measurements is the first step toward the quantitative evaluation of the irreversible degradation in CICC, which is estimated from the discrepancy of the predicted vs. actual CICC performance. This paper describes a novel method for the in-situ measurement of the in a large CICC, including the monitoring of during the electromagnetic cyclic loading test campaign in SULTAN of the ITER conductors.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 3 )

Date of Publication:

June 2012

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