DEVELOPMENT OF Nb_3Sn WIRES MADE BY THE INTERNAL-TIN PROCESS

摘要

A survey is given of the test results obtained on the internal-tin Nb_3Sn strand produced by IGC for the Central Solenoid Model Coil (CSMC) program for the International Thermonuclear Experimental Reactor (ITER). Approximately four tonnes of strand have been fabricated, tested and the data analyzed. The results show a relatively small variation in the measured properties.The standard ITER strand design has also been modified by changing the Cu and Sn percentage, the composition, size and spacing of the filaments, and the size and chemical nature of the barrier. As a result of this work, a range of materials, each with significantly different properties, was produced. One such material met the original HP 1 specification more completely than earlier material. Another met the HP-2 specification and a third was used successfully in one of the inner coils of D20, the world's highest field dipole, recently tested at Lawrence Berkeley National Laboratory (LBNL).