Bi-2223 silver sheathed tapes are currently used in prototypes of HTS power devices, where they generally carry an electrical ac current and are exposed to an alternating magnetic field that may have different orientation with respect to the tape. In this work we describe the experimental set-up for measuring ac losses of HTS tapes due to the simultaneous presence of ac current and ac magnetic field. The experimental results have been compared and contrasted with a numerical model purposely developed for the evaluation of current distribution and ac loss in HTS tapes.
Abstract-The preseries production of the LHC main superconducting dipoles is presently being tested at CERN. The foremost features of these magnets are: twin structure, six block two layer coils wound from 15.1 mm wide graded NbTi cables, 56 mm aperture, polyimide insulation and stainless steel collars. This paper reviews the main test results of magnets tested to day in both normal and superfluid helium. The results of the training performance, magnet protection, electrical integrity and the field quality are presented in terms of the specifications and expected performance of these magnets in the future accelerator.Index Terms-Magnetic field measurement, superconducting accelerator magnets.
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