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IBAD+PLD IBAD+PLD 法による 法による ReBCO ReBCO 線材の開発 線材の開発
山田穣
超電導工学研究所 名古屋高温超電導線材開発センター
山田穣
超電導工学研究所 名古屋高温超電導線材開発センター
低温工学会九州支部大会 鹿児島大学
2006
年7
月20
日 人工ピン線材の表面構造1 10 100
0 50 100 150 200 250 300
Deposition time ( min.)
PLD-CeO
2Single Crystal Level Practical
Conductor Level
PLD-CeO 2
∆φ (deg.)
Hastelloy C IBAD-Gd2Zr2O7 PLD-CeO2
IBAD-Gd 2 Zr 2 O 7
1min → 10°
6min → 5.6°
Self Self - - epitaxial PLD epitaxial PLD - - CeO CeO 2 2 Cap Layer on IBAD Cap Layer on IBAD
3
大面積化、高速化が可能
Multi-Turn Multi-Plume Multi-Turn Multi-Plume
New Method for PLD
New Method for PLD - - YBCO YBCO
- - Multi Multi - - Plume and Multi Plume and Multi - - Turn PLD Turn PLD - -
8 layers/30m/h = total production speed 3.75 m/h 2005.Aug.26 18:30 245A
(@21mV/212m
=1microV/cm)
↑0A ↑100A ↑200A ↑250A 5mV
10mV 15mV 20mV 25mV
0mV 30mV
Just after winding (95cm winding dia.)
212.6m x 245A = 52,087Am
Largest Ic x L Conductor
Largest Ic x L Conductor （２００５） （２００５）
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Ranking (June,2006)
YBCO(MOCVD)/CeO2(PLD)/GZO(IBAD)/Haste
203
lloy93 Chubu
18,879
4th
YBCO(TFA-MOD)/CeO2/ YSZ/Y2O3/Ni-W
90 168
AMSC 15,120
5th
YBCO(PLD)/CeO2(PLD) /GZO(IBAD)/Hastelloy
212.6 245
SRL-ISTEC 52,087
1st
YBCO(MOCVD)/STO/MgO(Cap)/MgO(IBAD) /Y2O3/Al2O3/Hatelloy
207 IGC-Super 107
Power 22,055
2nd
YBCO(PLD)/CeO2(PLD)/GZO(IBAD)/Hastelloy
217 88
Fujikura 19,100
3rd
YBCO(TFA-MOD)
/CeO2(PLD)/GZO(IBAD)/Hastelloy
25 100
SRL-ISTEC 2,500
9th
YBCO(PLD)/YSZ(IBAD)/S.S.
10 Goettingen 223
2,230
10th
155 235 110(I
cmin.)
I
c(A/cm-w)
YBCO(TFA-MOD)
/CeO2(PLD)/GZO(IBAD)/Hastelloy
40 SWCC
6,200
8th
YBCO(HR-PLD)/CeO2/YSZ/S.S.
40 EHTS
9,400
7th
HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy
117 Sumitomo
12,870
6th
Processing L(m)
Organization I
cx L
(Am)
th
HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy
117 Sumitomo
12,870
6th
Processing L(m)
Organization I
cx L
(Am)
New Record 70,520Am IGC-Super Power 219A 322m YBCO(MOCVD)/IBAD
0. 0001 0. 001 0. 01 0. 1 1
0 2 4 6 8 10
B(T)
J
cB/J
c(0)Gd0.25μｍ Gd0.83μｍ Gd1.25μｍ Y0.5μｍ Y1.5μｍ Y2.0μｍ
1.25µm 0.25µm 0.83µm 0.5µm
2.0µm 1.5µm
Gd
Y
ref.) K. Takahashi et al : Supercond. Sci. Technol. 18, 1118 (2005) K. Takahashi presented at CCA 2005, Santa Fe, USA (2005)
短尺試験結果： GdBCO が有望
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High Ic of
High Ic of GdBCO GdBCO Coated Conductor Coated Conductor
0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06 5.00E-06 6.00E-06 7.00E-06 8.00E-06 9.00E-06 1.00E-05
0 100 200 300 400 500
I
(A)Vo lt ag e ( V )
470 A / 9 mm n value = 21
3.6 µ m in thickness J c = 1.45 MA/cm 2
77K,self-field
I c = 522 A/cm
32 m long GdBCO coated conductor
end-to-end I c 205 A
GdBCO
線材 最初の長尺試験J c = 1.36 MA/cm 2
0 50 100 150 200 250 300
0 5 10 15 20 25 30
Position on Tape (m)
Ic(A) End-to-end Ic
Distance of each plot point is 0.8 m
Max. 266.7 A Min. 188.2 A STDEV 14.0 %
GdBCO layer 1.50 µm in
thickness
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0.1 1 10 100 1000
0 2 4 6 8
GdBCO
GdBCO長尺線材と 長尺線材とYBCO YBCO長尺線材の 長尺線材の 77K 77 K における臨界電流の磁場依存性 における臨界電流の磁場依存性
I c (A)
磁場
(T)
77K
YBCO, B // c YBCO, B ⊥ c
3 倍
3 T
GdBCO
のB//c
での臨界電流は高い。YBCO
に比べてc
軸に平行なピ ン止めサイトが多く導入されていると考えられる。GdBCO, B // c
GdBCO, B
⊥c
I c -B θ characteristics of 32 m long GdBCO coated conductor
0 5 10 15 20 25 30 35 40 45
-45 0 45 90 135 180
θ (deg. ) I
c(A )
3 T ， 77 K
B//c -axis B ⊥ c -axis
GdBCO
YBCO
32 m long GdBCO coated conductor I c = 205 A 212.6 m long YBCO coated conductor I c = 245 A
3 times higher
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Production speed of 32 m long GdBCO coated conductor
Tape transferring speed
30 m/h
Deposition time
3 times Production speed
10 m/h
0 2 4 6 8 10 12
P roduc ti on s p e e d ( m /h )
Conventional PLD method
(1.0 m/h)
212.6 m, 245 A YBCO coated conductor using MPMT-PLD method
(3.75 m/h)
32 m, 205 A
GdBCO coated conductor using MPMT-PLD method
(10 m/h)
Yield of 32 m long GdBCO layer using MPMT-PLD method
Volume of 32 m long GdBCO layer 0.432 cm
3Theoretical density of GdBCO 6.99 g/cm
3Total loss of GdBCO target weight 3.87 g × 3 = 11.62 g
Yield of 32 m long GdBCO layer using MPMT-PLD method 26 %
0 5 10 15 20 25 30
Y ie ld of RE BCO l a ye r (%)
Conventional PLD method
(2.6 %)
212.6 m long YBCO layer using MPMT-PLD method
(20.7 %)
32 m long GdBCO layer using MPMT-PLD method
(26 %)
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Ic Ranking at 0T (June,2006)
YBCO(MOCVD)/CeO2(PLD)/GZO(IBAD)/Haste
203
lloy93 Chubu
18,879
4th
YBCO(TFA-MOD)/CeO2/ YSZ/Y2O3/Ni-W
90 168
AMSC 15,120
5th
YBCO(PLD)/CeO2(PLD) /GZO(IBAD)/Hastelloy
212.6 245
SRL-ISTEC 52,087
1st
YBCO(MOCVD)/STO/MgO(Cap)/MgO(IBAD) /Y2O3/Al2O3/Hatelloy
207 IGC-Super 107
Power 22,055
2nd
YBCO(PLD)/CeO2(PLD)/GZO(IBAD)/Hastelloy
217 88
Fujikura 19,100
3rd
YBCO(TFA-MOD)
/CeO2(PLD)/GZO(IBAD)/Hastelloy
25 100
SRL-ISTEC 2,500
9th
YBCO(PLD)/YSZ(IBAD)/S.S.
10 Goettingen 223
2,230
10th
155 235 110(I
cmin.)
I
c(A/cm-w)
YBCO(TFA-MOD)
/CeO2(PLD)/GZO(IBAD)/Hastelloy
40 SWCC
6,200
8th
YBCO(HR-PLD)/CeO2/YSZ/S.S.
40 EHTS
9,400
7th
HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy
117 Sumitomo
12,870
6th
Processing L(m)
Organization I
cx L
(Am)
th
HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy
117 Sumitomo
12,870
6th
Processing L(m)
Organization I
cx L
(Am)
New Record 70,520Am IGC-Super Power 219A 322m YBCO(MOCVD)/IBAD
New GdBCO Conductor 6,560Am SRL-ISTEC 205A 32m PLD/IBAD 3T
では、どうなるか?
Newest GdBCO Conductor 11,108Am SRL-ISTEC 183A 60.7m PLD/IBAD
60m GdBCO End-to-End Ic = 183A
0.00 50.00 100.00 150.00 200.00 250.00
0 10 20 30 40 50 60
Measurement Position (m)
Ic(A)
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Bamboo structure formed during YBCO film growth
YBCO
CeO
2Bright-field image
c b a
a
b
c
TEM by H. Sasaki &T. Kato, JFCC
Bamboo structure (BZO/YBCO) by PLD
Nano-Epitaxy
Alignment in a long range order
10nm
CeO2
Y. Yamada, APL 87, Sept.26 132502(2005).
For Nano-designing of Superconducting Wire
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Vortex Lattice
Lorentz Force
AP
Hastelloy: 100 µm thick IBAD-GZO； ∆φ=13〜19°
PLD-CeO2；∆φ=4〜8.7° PLD-YBCO
人工ピンと
人工ピンと Vortex Vortex
AP
Artificial Pinning Trial (1)
of YSZ on MgO
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B// c-axis
0 .1 1 1 0 1 0 0 1 0 0 0
0 2 4 6 8 10
B(T) Ic(A)
Y1 2 3 ＋2 vo l% YS Z- 0 .1 5 μm Y1 2 3 ＋2 vo l% YS Z- 0 .3 3 μm Y1 2 3 ＋2 vo l% YS Z- 0 .5 9 μm Y1 2 3 ＋2 vo l% YS Z- 1 .1 6 μm
Bamboo structure is effective in a thick Bamboo structure is effective in a thick
film (>1
film (>1 μ μ m m ). ).
40.7A 40.7 A at at 3T 3T
I I value increased up to 1.16 μ value increased up to 1.16 μ m m （ （ B//c- B//c -axis axis） ） . .
0 5 0 1 0 0 1 5 0 2 0 0 2 5 0
0 0 . 5 1 1 . 5
thickness（μm ） I
c(A )
0 T 1 T 3 T 5 T
Ｂ//c‑axis
20A 20 A NEDO target NEDO target 2005 2005
7.9A 7.9 A YBCO YBCO
max max
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TEM of 1.8
TEM of 1.8 μ μ m thick YBCO m thick YBCO - - bamboo bamboo
TEM by
TEM by ＪＦＣＣ ＪＦＣＣ Kato Kato
CeO 2
YBCO with BZO a
CeO 2
YBCO with BZO
The bamboo grew up vertically to the surface.
The bamboo grew up vertically to the surface.
1.8μ 1.8 μ m m
Plan-view electron micrographs of Y123 with BaZrO 3 rods and selected area diffraction pattern
Bright-field image Dark-field image
TEM Plan View: 5nm dia. Bamboo finely
dispersed with 15-30 nm inter-distance. （ JFCC ）
0
19
10 20 30 40 50 60 70
-45 0 45 90 135
Angle(degree)
I
c (A/cm)3.6μm-Gd-5mol%ZrO2 3.6μm−Gd
1.8μm-Y-2vol%YSZ
磁場角度依存性 磁場角度依存性
ZrO ZrO 2 2 doped doped ＧｄＢＣＯ（７７Ｋ ＧｄＢＣＯ（７７Ｋ , , ３ ３ T T ） ）
>60A //c
Ic min
>40A
まとめ
2. GdBCO
は、YBCO
より磁場特性に優れ、磁場応用に有効である。30m
、60m
級の線材で確認済み。Ic at 3T//c rate
YBCO 8A *3.75m/h GdBCO >25A * 10m/hr YBCO+ Bamboo >40A
GdBCO+ Bamboo >60A
1.
マルチプルームマルチターンPLD
法は、高特性の長尺線材作 製に有望である。YBCO
線材で、I c = 245A for 212.6m
(I c xL=52087Am)
を得た。3. YSZ
などを混合したいわゆるバンブー構造がピンニングに有効であり、
GdBCO
からさらに特性を上げることができる。4.
応用を見据えた特性向上の検討がますます重要である。30m, 60m long CC
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