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We have developed a model that describes the transverse load degradation inNb3Sn CICCs, based on strand and cable properties, and that predicts how suchdegradation can be prevented. We present the model for TransverseElectro-Magnetic Load Optimisation (TEMLOP) and report the first results ofcomputations for ITER type of conductors, based on the measured properties ofthe internal tin strand used for the Toroidal Field Model Coil (TFMC). The mostimportant conclusion of the model computations is that the problem of thesevere degradation of large CICCs can be drastically and straightforwardlysolved by increasing the pitch length of subsequent cabling stages. It is forthe first time that an increase of the pitches is proposed and no experimentaldata are available to confirm this outcome of the TEMLOP model. Larger pitchlengths will result in a more homogeneous distribution of the stresses andstrains in the cable by significantly moderating the local peak stressesassociated with the intermediate-length twist pitches. The twist pitch schemeof the present conductor layout turns out to be unfortunately close to a worstcase scenario. It is possible to improve the ITER conductor design or theoperation margin, by mainly a change in the cabling scheme. We also find that alower cable void fraction and larger strand stiffness add to a furtherimprovement of the conductor performance

Transverse load optimization in Nb3Sn CICC design; influence of cabling, void fraction and strand stiffness

Transverse load optimization in Nb₃Sn CICC design; influence of cabling, void fraction and strand stiffness