ybco/ibad/inconel coated conductor with end-to-end critical current of 96 a at 75 k
DESCRIPTION
Los Alamos. Materials Science and Technology. YBCO/IBAD/Inconel coated conductor with end-to-end critical current of 96 A at 75 K. STC: Superconductivity Technology Center. 7. 10. 6. 10. 5. 10. YBCO H(||)c (4K). YBCO H||c (75K). Critical Current Density (A/cm2). YBCO H||ab (75K). 4. - PowerPoint PPT PresentationTRANSCRIPT
YBCO/IBAD/Inconel coated conductor withend-to-end critical current of 96 A at 75 K
Los AlamosMaterials Science and Technology
STC: Superconductivity Technology Center
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Position on tape (cm)
Critical current (A)
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Critical current density (MA/cm
2)
Field Dependence ofCritical Current Density
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YBCO H(||)c (4K)YBCO H||c (75K)YBCO H||ab (75K)BSCCO H||c (75K)
H(T)
Cri
tical C
urr
en
t D
en
sit
y (
A/c
m2)
Bending Test
Compression
Sample ATension
Sample BTension after
Sample B
compression test
Nor
mal
ized
Cri
tical
Cur
rent
Strain (%)0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
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@ 75 K36mmSample16mm
Progress towards higher Ic in longer lengths
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Tape length (cm)
Critical current (Amps)75 K
1999
1998
1997
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1995 (batch mode)
The Jc reduction above 1.5 m appears related to an increase in surface roughness with YBCO thickness ...
Superconductivity Technology Center
0.39 m 1.5 m 3.0 m
Jc = 2.3 MA/cm2
calc. Ic = 90 A/cmJc = 1.5 MA/cm2
calc. Ic = 225 A/cmJc = 0.6 MA/cm2
calc. Ic = 180 A/cm
Ion milling shows that a multilayer structure allows Ic to continue to increase at thickness levels above 1.5 m
Superconductivity Technology Center
75 K -- Bridge dimensions: 150 m x 5 mm 0
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Superconductor thickness ( m)
Calculated critical current
( / - )A cm width YBCO single layer
(Y-Sm-Y-Sm-Y) multilayer
Rate of increase: 60 A/cm-width for each additional micron of superconductor thickness
Y123-Sm123 Multilayers Enabled Thicker Films with Higher Critical Currents
Superconductivity Technology Center
Y- Sm-Y- Sm-Y multilayer
YBCO thickness: ~1.1 m
SBCO thickness: ~ 0.2 m
Total thickness: 3.7 m
Jc: 1.1 MA/cm2 (75 K)
Calculated Ic: 405 A/cm-width
For comparison, Jc of a 3.7 m YBCO single-layer: 0.4 MA/cm2
Silver contactYBCOSm1Ba2Cu3O7-
CeO2
IBAD YSZInconel
Bridge dimensions: ~ 200 m x 5 mm
Modified superconductor processes push the Ic well beyond the 200 A/cm-width “barrier” to over 500 A/cm
Superconductivity Technology Center
Substrate: Inconel 625 with IBAD YSZ
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YBCO thickness ( m)
( /Critical current density MA cm
2 )Standard process (FY1999)
Modified processes (FY2000)
Ic for 1 cm wide tape
100 A 300 A 500 A
75 K -- bridges 200 m x 5 mm
IBAD MgO template forms at ~ 10 nm thickness - approximately 100 times thinner/faster than for IBAD YSZ
Los AlamosSuperconductivity Technology Center
0.1 µm
IBAD texture evolution vs. thickness
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Thickness (nm)
Phi
YSZ
MgO
Thickness (nm)
(
deg .
)
IBAD texture evolution vs. thickness
YBCO
YSZ
Epi MgO
Si3N4
Inconel 625
Y2O3
IBAD MgO
Ic (75K) = 42 A