Se.CRETTS : A stability experiment on the role of segregated copper in Nb3Sn cable-in-conduit conductors

In Se.C.R.E.T.S. (Segregated Copper Ratio Experiments on Transient Stabilit y), the stability performance under transverse field transient is compared for two Nb3Sn cable-in-conduit conductors which differ only because of the different distribution of the stabilizing copper, either included in the Nb 3Sn strand cross section or segregated as bundled copper wires. If the segr egated copper is found to be effective for stability purposes, the copper f raction in the Nb3Sn strands can be Substantially reduced, with dramatic co st advantage for the high field fusion magnets. The experiment is assembled in the SULTAN facility at CRPP, with 11 T background field and superimpose d transverse pulsed field to generate the transient disturbance. The layout of the conductor, the winding sample and the assembly procedure are descri bed. The instrumentation and the test program are planned to provide result s to be easily extrapolated to the ITER conductors.