Worldwide Benchmarking of ITER Internal Tin ${\rm Nb}_{3}{\rm Sn}$ and NbTi Strands Test Facilities

The ITER machine will require approximately 250 tons of NbTi strands and 500 tons of
${\rm Nb}_{3}{\rm Sn}$
strands. NbTi will be used in the Poloidal Field (PF) coils, Correction Coils (CC) and feeder busbars, whereas
${\rm Nb}_{3}{\rm Sn}$
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.