1. P. M. Grant, (Electric Power Research Institute)
Effect of Ferromagnetic Substrates on ac Losses in YBCO Coated Conductors
P. M. Grant, (Electric Power Research Institute)
N28.002: 8:12 14 March 2001

2. Coated Conductors Generation II Wire
Biaxially Oriented Y-123
Out of Japan, LANL, ORNL
DOE/Industry Alliance to Commercialize I H

3. Cross Section YBCO 1 m I 0.5 m YSZ + CeO2 Nickel H 50 m H 0.5 m

4. Biot-Savart z B  r z y Jdx’   x -a x’ a x Jdx’ -a a dx’ dBx(x,z) =0 2 Jz
(x-x’)2 + z2
dx’ 0
(x-x’)
dx’
- dBz(x,z) = J 2
(x-x’)2 + z2

5. Field Equations [ ] [ ] ) Bx(x,z) = 0 2 J tan-1 ( x+a z x-a - 1ln 0 1
Bz(x,z) = J 2 2

6. Field Distribution
a = 2 mm
J = 25 A/mm

7. Hysteresis B BS 2f H > HC ; P = HC BS 0  2f H < HC ; P = H2

8. Loss HC = 80 Oe BS = 6000 Gauss = 75 P = 0.14 W/m Measured ac Losses
Y-123 cc on Hastalloy (non-magnetic)
= 0.48 W/m (Ciszek, et al.)

9. does cost you something
Conclusions
“Spending a nickel
does cost you something
even these days”