Prospects for the use of high-Tc superconductors in fusion magnets and options for their test in SULTAN

摘要: In the last few years, critical current densities of long commercially available REBa2Cu3O7-x (RE-123, where RE represents Y or a rare earth element) coated conductors have reached values 250 A/cm-width at 77K and zero applied field. Even higher 600 A/cm-w (77 K, B = 0) been demonstrated in shorter lengths. The attractive features use these high-T-c superconductors (HTS) are operation temperatures above 20K and/or magnetic fields than those envisaged for ITER TF coils. Possible conditions HTS fusion magnets studied taking into consideration possible further improvements RE-123 conductors. Investigations stability quench behavior indicate that is not problem, whereas detection protection need attention. Because high currents necessary magnets, many tapes to be assembled transposed conductor. qualification would require their test 11 land well 10 kA. possibilities straight HIS conductor samples SULTAN considered. For 4.5 only development low resistance joint between under NbTi transformer necessary. Tests up sample connected with by conduction-cooled bus bar large thermal similar module lead. tests around 50K modified cryogenics. (C) 2013 Elsevier B.V. All rights reserved.