A benchmarking experiment was conducted to compare strain measurement facilities at the National Institute of Standards and Technology (NIST) and the University of Twente. The critical current of a bronze-route Nb3Sn wire, which was fabricated for the International Thermonuclear Experimental Reactor (ITER), was measured as a function of axial strain and magnetic field in liquid helium at both institutes. NIST used a Walters spring strain device and University of Twente used a bending beam (Pacman) apparatus. The ITER bronze-route wire investigated had a very high irreversible strain limit that allowed comparing data over a wide range of applied strain between -1 % and +1 %. Similarities of the data obtained by use of the two apparatuses were remarkable, despite the many differences in their design and techniques.
Citation: IEEE Transactions on Applied Superconductivity
Pub Type: Journals
Benchmarking, ITER, niobium-tin, strain