Speakers
Description
The large-scale superconducting magnet in controlled nuclear fusion systems and accelerators are key components for achieving high magnetic fields. As a superconducting conductor made from high-temperature superconducting (HTS) tapes, quasi-isotropic strand (Q-IS) exhibits quasi-isotropic properties such as thermal and mechanical stability as well as making it an ideal choice for application in large scale magnets with high magnetic field. Q-IS can serve as the basic unit for manufacturing cables with higher current-carrying capacity, such as cable-in-conduit conductors (CICC), to meet the demands of large-scale superconducting magnets. However, Q-IS and CICC conductors carry direct current (DC) and are simultaneously to alternating current (AC) magnetic fields due to ripple current or charging and discharging so that the dynamic resistance appears, which affects the current distribution of among tapes or Q-ISs except for creating AC losses, decreasing its stability. In this paper, three-dimensional models of Q-IS and CICC were established, and finite element software was used to calculate the critical current and dynamic resistance based on the T-A model. The results demonstrate that their winding pitches significantly impact the dynamic resistance and are useful for design references for the application of large scale superconducting magnets made from Q-ISs based CICC.
