BRUKER HTS tape measurement John Himbele, Arnaud Badel, Pascal Tixador 1

Outline tape specifications ? Experimental setups Results Next steps 2

HTS tape specification 3 ReferenceT189T183 (measured) I c at 77 K52 A46 A width 4.05 ± 0.03 mm4.13 mm YBCO 1.7 ± 0.1 µm Shunt (copper)25 ± 3 µm x 2 Protection (silver)1.8 ± 0.2 µm Substrate 97 ± 3 µm Total thickness 150 ± 5 µm130 µm

Experimental setup in Ø 50 mm 4 Experimental setup properties Max. Field22 T Max. Current900 A or more ? Temperature4.2 K Sample length20 mm Anglefree Adjust angle of sample 1.3 m 35 mm Short length measurement

Experimental setup in Ø 170 mm 5 Experimental setup properties Max. Field17 T Max. Current2 kA Temperature4.2 K – 77 K Sample length55 mm for measure Angle0 and 90° Adjust angle of sample 1.8 m 115 mm long length measurement

T-183 characteristics at 4.2 K 6 Critical current under longitudinal field is larger than 900 A between 0 – 21 T. Test made on full width in Ø50 probe Je = 405 A/mm² at 18 T ┴ (Ic = 215 A)

Next steps 7 Test performances of new Ø 50 mm probe above 900 A Conduct measurements in Ø 170 mm to cross check results on longer samples What of n- value ? Needed for quench calculations ! ̶Extrapolation for Jc measurement leads to n = 45 : doubtful ̶Possibilities to test with pulse measurements Work ongoing with F. Sirois from Montreal on pulse characterization under high field :