Simulation of Interstrand Coupling Loss in Cable-In-Conduit Conductors With JackPot-AC

Within the framework of the design analysis of ITER PF coil joints, a model is developed that simulates the coupling loss between strands in a cable-in-conduit conductor (CICC). The present version of this model can simulate these losses in a cable section, subjected to any type of time-changing background field. It calculates the trajectories of all strands in the CICC, and uses this as the foundation for the electrical properties of the model, including strand transport properties, saturation and shielding. The simulation results are first compared with measurements on sub-size CICCs with different strand coating, which affects the interstrand resistance. In all but one of these simulations, the coupling loss time constants are lower than the measured values. A better agreement is obtained with the simulation of an ITER PF1 conductor, subjected to Twente Press experiments. For this simulation, only one final stage sub-cable is used, assuming that coupling currents between them is negligible due to the stainless steel wraps around them.

[1]  L. Muzzi,et al.  Effect of cyclic loading and conductor layout on contact resistance of full-size ITER PFCI conductors , 2005, IEEE Transactions on Applied Superconductivity.

[2]  A. Nijhuis,et al.  Simulation of the ITER Poloidal Field Coil Insert DC performance with a new model , 2009 .

[3]  R. Perin.  Superconducting magnets , 1982, Nature.

[4]  D. Ciazynski,et al.  Electrical and thermal designs and analyses of joints for the ITER PF coils , 2002 .

[5]  Arend Nijhuis,et al.  JackPot: A novel model to study the influence of current non-uniformity and cabling patterns in cable-in-conduit conductors , 2010 .

[6]  Arend Nijhuis,et al.  Control of contact resistance by strand surface coating in 36-strand NbTi CICCs , 2001 .

[7]  Arend Nijhuis,et al.  THELMA code electromagnetic model of ITER superconducting cables and application to the ENEA Stability Experiment , 2006 .

[8]  Neil Mitchell,et al.  Performance Analysis of the ITER Poloidal Field Coil Conductors , 2010, IEEE Transactions on Applied Superconductivity.

[9]  N. Mitchell,et al.  The ITER Magnet System , 2008, IEEE Transactions on Applied Superconductivity.

[10]  N. Mitchell.  Modelling of non-uniform current diffusion coupled with thermohydraulic effects in superconducting cables , 2000 .

[11]  Arend Nijhuis,et al.  Interpretation of conduit voltage measurements on the poloidal field insert sample using the CUDI–CICC numerical code , 2006 .

[12]  C. Sborchia,et al.  Test results of the ITER PF insert conductor short sample in SULTAN , 2005, IEEE Transactions on Applied Superconductivity.

[13]  N. Mitchell,et al.  Electromagnetic and mechanical characterisation of ITER CS-MC conductors affected by transverse cyclic loading. I. Coupling current loss , 1999, IEEE Transactions on Applied Superconductivity.

[14]  C. Sborchia,et al.  Test Results From the PF Conductor Insert Coil and Implications for the ITER PF System , 2009, IEEE Transactions on Applied Superconductivity.