THELMA code electromagnetic model of ITER superconducting cables and application to the ENEA Stability Experiment

The new THELMA code, including a thermal-hydraulic (TH) and an electro-magnetic (EM) model of a cable-in-conduit conductor (CICC), has been developed. The TH model is at this stage relatively conventional, with two fluid components (He flowing in the annular cable region and He flowing in the central channel) being particular to the CICC of the International Thermonuclear Experimental Reactor (ITER), and two solid components (superconducting strands and jacket/conduit). In contrast, the EM model is novel and will be presented here in full detail. The results obtained from this first version of the code are compared with experimental results from pulsed tests of the ENEA stability experiment (ESE), showing good agreement between computed and measured deposited energy and subsequent temperature increase.

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

[2]  N Mitchell,et al.  Summary, assessment and implications of the ITER Model Coil test results , 2003 .

[3]  Roberto Zanino,et al.  A two-fluid code for the thermohydraulic transient analysis of CICC superconducting magnets , 1995 .

[4]  William H. Press,et al.  Numerical Recipes in Fortran 77: The Art of Scientific Computing 2nd Editionn - Volume 1 of Fortran Numerical Recipes , 1992 .

[6]  N. Martovetsky.  ITER Model Coil tests overview: Nb3Sn strand properties in cable-in-conduit conductors , 2004 .

[7]  A. A. Akhmetov.  Network models of superconducting cables and the results of the matrix approach to their description , 1998 .

[8]  Neil Mitchell,et al.  Analysis and interpretation of the full set (2000–2002) of TCS tests in conductor 1A of the ITER Central Solenoid Model Coil , 2003 .

[9]  G. Zavarise,et al.  Modeling a multistrand SC cable with an electrical DC lumped network , 2002 .

[10]  Arend Nijhuis,et al.  Parametric study on coupling loss in subsize ITER Nb/sub 3/Sn cabled specimen , 1996 .

[11]  F. Bellina,et al.  Modeling AC losses in the ITER NbTi poloidal field full size joint sample (PF-FSJS) using the THELMA code , 2005 .

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

[13]  R. Zanino,et al.  Implications of NbTi Short-Sample Test Results and Analysis for the ITER Poloidal Field Conductor Insert (PFCI) , 2006, IEEE Transactions on Applied Superconductivity.

[14]  A. Verweij.  ELECTRODYNAMICS OF SUPERCONDUCTING CABLES IN ACCELERATOR MAGNETS , 2004 .

[15]  A. M. Miri,et al.  Numerical investigation of the current distribution in cable-in-conduit conductors using lumped network models , 2001 .

[16]  L. Bottura,et al.  A general model for thermal, hydraulic and electric analysis of superconducting cables , 2000 .

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

[18]  H. G. Knoopers,et al.  Effect of self-field and current non-uniformity on the voltage–temperature characteristic of the ITER central solenoid insert coil by numerical calculations , 2002 .

[19]  Laura Savoldi,et al.  Thermal-Hydraulic Analysis of Tcs Measurement in Conductor 1A of the ITER Central Solenoid Model Coil using the M&M Code , 2000 .

[20]  P. Biringer,et al.  Low-frequency eddy-current loss estimation in long conductors by using the moment of inertia of cross sections , 1988 .

[21]  Roberto Zanino,et al.  Performance evaluation of the ITER Toroidal Field Model Coil phase I. Part 2: M&M analysis and interpretation , 2003 .

[22]  L. Bottura,et al.  A continuum model for current distribution in Rutherford cables , 2001 .

[23]  Magnetic method for AC losses measurement of coil wound CICCs in pulsed regimes , 2003 .

[24]  R. Zanino,et al.  DC performances of ITER NbTi conductors: models vs. measurements , 2005, IEEE Transactions on Applied Superconductivity.