Numerical analysis of the DC performance of ITER TF samples with different cabling pattern based on resistance measurements on terminations

作者：van Lanen E P A^*; Nijhuis A

来源：Superconductor Science and Technology, 2011, 24(8): 085010.

DOI：10.1088/0953-2048/24/8/085010

The DC transport properties of ITER TF conductors are analyzed in the SULTAN facility, but their associated current sharing temperature (T(cs)) can give scope for different interpretations. To extract the conductor's pure performance during such short sample tests requires a detailed quantitative model such as JackPot, for which as many as possible input parameters are based on experimentally verified data. The crucial interstrand contact resistance data of the TFPRO-2 and TFJA-3 samples, which have a different cabling and joint layout, has recently become available. With only three parameters for JackPot's joint model, we were able to find a good match between the measured and simulated interstrand resistances for all terminations, despite their different layout. For Nb(3)Sn conductors, the axial strain is the only free model parameter left for matching the simulations with SULTAN T(cs) tests. We were able to find a match with the measured voltage-temperature characteristic for all but one conductor. The simulation results indicate that the termination layout can be the cause of lower sample performance due to current imbalance. The outcome of this analysis also confirms that transverse load degradation can be significantly mitigated by finding an optimal set of cable twist pitches.

• 出版日期2011-8