TY - JOUR
T1 - THELMA code analysis of bronze route Nb3Sn strand bending effect on Ic
AU - Ribani, P. L.
AU - Boso, D. P.
AU - Lefik, M.
AU - Nunoya, Y.
AU - Savoldi Richard, L.
AU - Schrefler, B. A.
AU - Zanino, R.
N1 - Funding Information:
Manuscript received September 20, 2005. This work was supported in part by EFDA-MIUR. P. L. Ribani is with Dipartimento di Ingegneria Elettrica, Università di Bologna, 40136 Bologna, Italy (e-mail: [email protected]). D. P. Boso and B. A. Schrefler are with Dipartimento di Costruzioni e Trasporti, Università di Padova, 35131 Padova, Italy (e-mail: boso@dic. unipd.it; [email protected]). M. Lefik is with the Technical University of Łódz, 93-590 Lodz, Poland (e-mail: [email protected]). Y. Nunoya is with JAERI, Naka, Japan (e-mail: [email protected]). L. Savoldi Richard and R. Zanino are with Dipartimento di Ener-getica, Politecnico, I-10129 Torino, Italy (e-mail: [email protected]; [email protected]). Digital Object Identifier 10.1109/TASC.2006.873337
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/6
Y1 - 2006/6
N2 - The THELMA (Thermal-Hydraulic-ELectro-MAgnetic) code has been developed with the aim of simulating the main aspects of superconductors to be used in the coils of the International Thermonuclear Experimental Reactor (ITER), An application of the code is presented here, where THELMA is used to simulate a single strand by considering, as cable elements, groups of superconducting (SC) filaments and the corresponding portion of the resistive matrix. This approach is used to reproduce the voltage-current characteristic of a Nb3Sn bronze route strand when subject to a bending mechanical load. Attention is focused particularly on the effect of the applied mechanical load on the critical current, which is considered a relevant item in the explanation of the degradation of the coil performance observed in several ITER Model and Insert Coil experiments. The longitudinal strain of the SC filaments is calculated by means of a composite beam model of the strand, taking into account the nonlinear, temperature-dependent material characteristics of the components. The whole load history is simulated, computing first the thermal strain due to cool-down, and then the mechanical strain due to the bending at 4.2 K.
AB - The THELMA (Thermal-Hydraulic-ELectro-MAgnetic) code has been developed with the aim of simulating the main aspects of superconductors to be used in the coils of the International Thermonuclear Experimental Reactor (ITER), An application of the code is presented here, where THELMA is used to simulate a single strand by considering, as cable elements, groups of superconducting (SC) filaments and the corresponding portion of the resistive matrix. This approach is used to reproduce the voltage-current characteristic of a Nb3Sn bronze route strand when subject to a bending mechanical load. Attention is focused particularly on the effect of the applied mechanical load on the critical current, which is considered a relevant item in the explanation of the degradation of the coil performance observed in several ITER Model and Insert Coil experiments. The longitudinal strain of the SC filaments is calculated by means of a composite beam model of the strand, taking into account the nonlinear, temperature-dependent material characteristics of the components. The whole load history is simulated, computing first the thermal strain due to cool-down, and then the mechanical strain due to the bending at 4.2 K.
KW - Bending strain
KW - Electromagnetic analysis
KW - Superconducting cables
KW - Superconducting magnets
UR - http://www.scopus.com/inward/record.url?scp=33746611637&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33746611637&partnerID=8YFLogxK
U2 - 10.1109/TASC.2006.873337
DO - 10.1109/TASC.2006.873337
M3 - Article
AN - SCOPUS:33746611637
SN - 1051-8223
VL - 16
SP - 860
EP - 863
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
M1 - 1642983
ER -