Stability and design criterion for cable-in-conduit-conductors with a broad transition to normal state |
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| Affiliation: | 1. National Institute of Laser, Plasma and Radiation Physics, Street Atomistilor 409, 077125 Magurele, Romania;2. Doctoral School of Science and Material Engineering, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania;3. National Institute of Materials Physics, Street Atomistilor 405A, 077125 Magurele, Romania;4. EA-IRFM, F-13108 Saint-Paul-Lez-Durance, France;1. Institute of Non-Ferrous Metals Light Metals Division, 19 Piłsudskiego Street, 32-050 Skawina, Poland;2. Laboratory of Metrology and Materials Science METLAB, Harcerska 40 Street, 52-404 Wroclaw, Poland;3. Pratt& Whitney Rzeszów S.A., Hetmańska 120 Street, 35-001 Rzeszow, Poland;4. Loewy Institute, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015-1657, U.S.A.;1. Fairfield University School of Engineering, Department of Mechanical Engineering, 1073 North Benson Rd., Fairfield, CT 06824, United States;2. Computer, Computational, and Statistical Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States;3. Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI 02912, United States |
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| Abstract: | Stability criterion in cable-in-conduit conductors (CICC) is often associated with heat removal rate higher than heat generated in the normal zone, which requires low current density in the strands. We show that this criterion is not a mandatory requirement for serviceability of CICC and that CICC may work reliably at higher current densities. In conditions of limited and well defined perturbations, sufficient stability is provided not by a large amount of copper and high transient heat transfer, but by a smooth transition to the normal state and easy current redistribution. A strand parameter space in terms of Ic and N-value meeting CICC requirements for stability, limited heat generation, and minimum temperature margin is proposed and discussed. The theory predictions are compared with known experimental data on CICC. |
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