COUPLING CURRENTS LOSSES BENCH-MARK TEST OF ITER SUBSIZE CONDUCTOR

To solve the discrepancies frequently observed between coupling curren ts losses results measured on similar samples at different labs, a ben ch mark rest action has been carried out among five laboratories of th e four partners of the ITER project. The specimen for the bench mark a ction is a short sections of Nb3Sn cable-in-conduit conductor with the same layout as the last but one stage of the ITER conductor. The five labs measure the AC losses by boil-off calorimetry. The test programm e, selected according to the capabilities of the test equipment, allow s a direct comparison of the test results over a broad range of field pulses.