Abstract
We measured the hysteresis and coupling losses of a prototype braided and twisted NbTi cable-inconduit superconductor for direct cooling by supercritical He. The conductor has been designed for a 180 MJ magnetic energy storage model coil with Bmax = 5.4 T at Imax = 10 kA. We also measured separately the ac losses of the subcables and of the basic NbTi multifilament strands. A chromium coating of the strands reduced the coupling losses in the cable considerably. We also determined the influence of cable void fraction on the coupling losses. Concerning a further potential ac loss reduction it turns out, that for our envisaged coil discharge velocity it would be necessary to reduce the hysteresis losses in the filaments.
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References
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To be submitted by the authors to Cryogenics.
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Kwasnitza, K., Sultan, A., Al-Wakeel, S., Salathé, D. (1994). AC-Losses of a Prototype 10 kA Cable-in-Conduit NbTi Superconductor for SMES Applications. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_65
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DOI: https://doi.org/10.1007/978-1-4757-9053-5_65
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