Measurements of coupling losses in superconducting cable-in-conduit conductors affected by internal transverse electromagnetic-forces

In order to elucidate the dependence of the internal electromagnetic-forces on the interstrand coupling loss in superconducting cable-in-conduit conductors, we develop a new measuring system. This system enables us to measure the coupling loss of large scale conductors with transport current of 20 kA and the transverse magnetic field of 3.22 T bias in the wide frequency range of the superposed ripple field of 0.1-300 Hz. The data of the preliminary measurements show that the change of the coupling loss is only a little in the low frequency range to the extent of the electromagnetic-force of 0.44 MPa in the case of IS-conductor of the poloidal field coil for LHD.