Speaker
Description
High temperature superconducting (HTS) materials are increasingly of interest for high field magnets applications such as high field insert magnets for particle accelerator and fusion magnets. Symmetric Tape Round (STAR) wire cable has shown outstanding performance in current carrying ability, and therefore becomes a promising materials candidate for high field applications. On the other hand, the high magnetization and flux creep in HTS conductors can lead to a substantial time-varying error field during magnet operation. Hence, it is important to know these quantities so that the error field can be corrected or compensated during magnet design. In this study, we measured the magnetization and flux creep of a STAR cable through a 12-T magnet system. The sample was measured from -4 T to 8 T at a sweeping rate of 3.77 mT/s, and we extracted magnetization and penetration field based on the measured M-H loop. For flux creep analyses focused on the injection field region (< 1T). We performed five different field sequences, (1) 0 – 4 T – 0 – 1 T – Hold for 1800 s, (2) 0 – 4 T – 0.8 T – 1 T – Hold for 1800 s, (3) 0 – 4 T – 0.6 T – 1 T – Hold for 1800 s, (4) 0 – 4 T – 0.4 T – 1 T – Hold for 1800 s, (5) 0 – 4 T – 0.2 T – 1 T – Hold for 1800 s. The measured results, both magnetization and flux creep, were compared with a CORC cable that was studied by our group through a similar approach.
