The performance of the conduction cooled 2G HTS magnet wound without turn to turn insulation generating 4.1T in 102mm bore

다국어 초록 (Multilingual Abstract)

A large bore magnet coil wound without turn to turn insulation was fabricated and cooled down to 10K by conduction cooling. The coil has room temperature bore of 102mm in diameter and consists of 22 double pancakes wound with 2G HTS conductor on aluminium alloy bobbin. Tests for 22 double pancake coils were performed at 77K for individual single DPC, coupled 2 DPCs, 4DPCs, 8DPCs and 22DPCs. Tested DPCs were connected by splice joint and assembled coil structure was installed to the vacuum cryostat with radiation shield and cooled down to 10K for 28h. The coil generate 4.1T when operating current ramped to 200A by 0.1A/s without quench. Test results agreed well with the designed performance showing field homogeneity of 0.021% for radial axis and 0.056% for vertical axis in 10mm DSV at 4.1073T. The magnet showed quench at 210A when ramping rate was 0.15A/s at 10K. The results showed that without turn to turn insulation winding method is a possible option for making compact magnet coil with sufficient structural integrity, thermal and electrical stability at the same time.