1

BRUKER HTS tape measurementJohn Himbele, Arnaud Badel, Pascal Tixador

2

Outline

• tape specifications ?

• Experimental setups

• Results

• Next steps

3

HTS tape specification

Reference T189 T183 (measured)Ic at 77 K 52 A 46 A

width 4.05 ± 0.03 mm 4.13 mmYBCO 1.7 ± 0.1 µm

Shunt (copper) 25 ± 3 µm x 2Protection (silver) 1.8 ± 0.2 µm

Substrate 97 ± 3 µmTotal thickness 150 ± 5 µm 130 µm

4

Experimental setup in Ø 50 mm

Experimental setup properties

Max. Field 22 T

Max. Current 900 A or more ?

Temperature 4.2 K

Sample length 20 mm

Angle free

Adjust angle of sample

1.3 m

35 mm

Short length measurement

5

Experimental setup in Ø 170 mm

Experimental setup properties

Max. Field 17 T

Max. Current 2 kA

Temperature 4.2 K – 77 K

Sample length 55 mm for measure

Angle 0 and 90°

Adjust angle of sample

1.8 m

115 mm

long length measurement

6

T-183 characteristics at 4.2 K

Critical current under longitudinal field is larger than 900 A between 0 – 21 T.

0 2 5 10 15 20 220

200

400

600

800

1000

1200

Applied magnetic field (T)

Crit

ical

cur

rent

(A)

Ic transverseIc longitudinal (Lower boundary)

375

750

1125

1500

1875

2250

Crit

ical

cur

rent

den

sity

(A/m

m²)

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 :