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Pong, I.,Jewell, M. C.,Bordini, B.,Oberli, L.,Liu, S.,Long, F.,Boutboul, T.,Readman, P.,Park, S.-H,Park, P.-Y,Pantsyrny, V.,Tronza, V.,Martovetsky, N.,Lu, J.,Devred, A. IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>The ITER machine will require approximately 250 tons of NbTi strands and 500 tons of Nb<SUB>3</SUB>Sn strands. NbTi will be used in the Poloidal Field (PF) coils, Correction Coils (CC) and feeder busbars, whereas Nb<SUB>3</SUB>Sn will be used in the Central Solenoid (CS) and Toroidal Field (TF) coils. The large amount of superconducting strands needed requires worldwide procurement, involving suppliers from six of the seven ITER Domestic Agencies (DAs). To ensure reliable test results, it is necessary to benchmark the test facilities at each supplier and at each DA reference laboratory for physical and superconducting properties measurement, as well as sample preparation techniques. Following previous benchmarking efforts related to ITER procurement in the mid-1990's and to supplier and DA laboratory qualification performed on bronze route Nb<SUB>3</SUB>Sn strands in 2009, we report here the latest rounds on internal tin Nb<SUB>3</SUB>Sn and NbTi strands. Ten participants from five DAs (China, EU, South Korea, Russia, and the U.S.) together with CERN (the ITER Organisation's reference laboratory) took part in the benchmarking of internal tin Nb<SUB>3</SUB>Sn strands, and six participants from China and Russia, plus CERN, participated in the benchmarking of NbTi strands.</P>
Benchmarking of Mechanical Test Facilities Related to ITER CICC Steel Jackets
Vostner, A.,Pong, I.,Bessette, D.,Devred, A.,Sgobba, S.,Jung, A.,Weiss, K.,Jewell, M. C.,Liu, S.,Yu, W.,Boutboul, T.,Hamada, K.,Park, S.,Tronza, V.,Walsh, R. P. IEEE 2013 IEEE transactions on applied superconductivity Vol.23 No.3
<P>The International Thermonuclear Experimental Reactor (ITER) cable-in-conduit conductor used in the superconducting magnet system consists of a cable made of 300 to 1440 strands housed in a stainless steel tube (called as jacket or conduit). There are circular, square, as well as circle-in-square jackets, made of either a very low carbon AISI 316LN and AISI 316L grade stainless steels, or a high Mn austenitic stainless steel developed for ITER called JK2LB. Selected mechanical properties of the base material and weld joint were tested at room temperature and/or cryogenic temperatures (<; 7 K) at predefined mechanical deformation and heat treatment condition. The domestic agencies' reference laboratories and the ITER-IO appointed reference laboratories, CERN and Karlsruhe Institute of Technology performed mechanical tests such as tensile strength, fracture toughness, and fatigue crack growth rate. This paper will compare the test results (e.g., elongation to failure) from different laboratories, present the statistics, and identify any systematic differences.</P>