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IBAD+PLD法によるReBCO線材の開発IBAD+PLD法によるReBCO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

2

1

10

100

0 50 100 150 200 250 300

Deposition time ( min.)

PLD-CeO2

Single Crystal Level

Practical Conductor Level

PLD-CeO2

∆φ

(deg

.)

Hastelloy C

IBAD-Gd2Zr2O7

PLD-CeO2

IBAD-Gd2Zr2O7

1min→10°6min→5.6°

SelfSelf--epitaxial PLDepitaxial PLD--CeOCeO22 Cap Layer on IBADCap Layer on IBAD

3

大面積化、高速化が可能

Multi-Turn Multi-PlumeMulti-Turn Multi-Plume

New Method for PLDNew Method for PLD--YBCOYBCO-- MultiMulti--Plume and MultiPlume and Multi--Turn PLD Turn PLD --

48 layers/30m/h = total production speed 3.75 m/h

2005.Aug.26 18:30 245A(@21mV/212m=1microV/cm)

↑0A ↑200A↑100A ↑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)/Hastelloy20393Chubu18,8794th

YBCO(TFA-MOD)/CeO2/ YSZ/Y2O3/Ni-W90168AMSC15,1205th

YBCO(PLD)/CeO2(PLD) /GZO(IBAD)/Hastelloy212.6245SRL-ISTEC52,0871st

YBCO(MOCVD)/STO/MgO(Cap)/MgO(IBAD) /Y2O3/Al2O3/Hatelloy207107IGC-Super

Power22,0552nd

YBCO(PLD)/CeO2(PLD)/GZO(IBAD)/Hastelloy21788Fujikura 19,1003rd

YBCO(TFA-MOD) /CeO2(PLD)/GZO(IBAD)/Hastelloy25100SRL-ISTEC2,5009th

YBCO(PLD)/YSZ(IBAD)/S.S.10223Goettingen2,23010th

155

235

110(Ic min.)

Ic(A/cm-w)

YBCO(TFA-MOD) /CeO2(PLD)/GZO(IBAD)/Hastelloy40SWCC6,2008th

YBCO(HR-PLD)/CeO2/YSZ/S.S.40EHTS9,4007th

HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy117Sumitomo12,8706th

ProcessingL(m)OrganizationIc x L(Am)

th

HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy117Sumitomo12,8706th

ProcessingL(m)OrganizationIc x L(Am)

New Record 70,520Am IGC-Super Power 219A 322m YBCO(MOCVD)/IBAD

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0.0001

0.001

0.01

0.1

1

0 2 4 6 8 10

B (T)

JcB

/Jc(0

)

Gd0.25μｍ

Gd0.83μｍ

Gd1.25μｍ

Y0.5μｍ

Y1.5μｍ

Y2.0μｍ

1.25µm

0.25µm0.83µm

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 ConductorCoated 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 500I (A)

Volt

age (

V)

470 A / 9 mm

n value = 21

3.6µm in thickness

Jc = 1.45 MA/cm2

77K,self-fieldIc = 522 A/cm

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32 m long GdBCO coated conductor

end-to-end Ic 205 A

GdBCO線材　最初の長尺試験

Jc = 1.36 MA/cm2

0

50

100

150

200

250

300

0 5 10 15 20 25 30

Position on Tape (m)I c

(A) End-to-end I c

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

GdBCOGdBCO長尺線材と長尺線材とYBCOYBCO長尺線材の長尺線材の 7777KK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⊥c3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

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Ic-Bθ characteristics of 32 m long GdBCO coated conductor

05

1015202530354045

-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 Ic = 205 A

212.6 m long YBCO coated conductor Ic = 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

Prod

uctio

n sp

eed

(m/h

)

ConventionalPLD method

(1.0 m/h)

212.6 m, 245 AYBCO coated conductor

using MPMT-PLD method(3.75 m/h)

32 m, 205 AGdBCO coated conductorusing MPMT-PLD method

(10 m/h)

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Yield of 32 m long GdBCO layer using MPMT-PLD method

Volume of 32 m long GdBCO layer 0.432 cm3

Theoretical density of GdBCO 6.99 g/cm3

Total 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

Yie

ld o

f REB

CO

laye

r (%

)

ConventionalPLD method

(2.6 %)

212.6 m long YBCO layerusing MPMT-PLD method

(20.7 %)

32 m long GdBCO layerusing MPMT-PLD method

(26 %)

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Ic Ranking at 0T (June,2006)

YBCO(MOCVD)/CeO2(PLD)/GZO(IBAD)/Hastelloy20393Chubu18,8794th

YBCO(TFA-MOD)/CeO2/ YSZ/Y2O3/Ni-W90168AMSC15,1205th

YBCO(PLD)/CeO2(PLD) /GZO(IBAD)/Hastelloy212.6245SRL-ISTEC52,0871st

YBCO(MOCVD)/STO/MgO(Cap)/MgO(IBAD) /Y2O3/Al2O3/Hatelloy207107IGC-Super

Power22,0552nd

YBCO(PLD)/CeO2(PLD)/GZO(IBAD)/Hastelloy21788Fujikura 19,1003rd

YBCO(TFA-MOD) /CeO2(PLD)/GZO(IBAD)/Hastelloy25100SRL-ISTEC2,5009th

YBCO(PLD)/YSZ(IBAD)/S.S.10223Goettingen2,23010th

155

235

110(Ic min.)

Ic(A/cm-w)

YBCO(TFA-MOD) /CeO2(PLD)/GZO(IBAD)/Hastelloy40SWCC6,2008th

YBCO(HR-PLD)/CeO2/YSZ/S.S.40EHTS9,4007th

HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy117Sumitomo12,8706th

ProcessingL(m)OrganizationIc x L(Am)

th

HoBCO(PLD)/CeO2 /YSZ CeO2 / Ni-alloy117Sumitomo12,8706th

ProcessingL(m)OrganizationIc x 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

CeO2

Bright-field image

cb

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VortexVortex

AP

Artificial Pinning Trial (1) of YSZ on MgO

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B//c-axis

0 .1

1

10

100

1000

0 2 4 6 8 10

B(T)

I c(A

)

Y1 23＋2vo l% YSZ-0 .15μm

Y123＋2vo l% YSZ-0 .33μm

Y123＋2vo l% YSZ-0 .59μm

Y123＋2vo l% YSZ-1 .16μm

Bamboo structure is effective in a thick Bamboo structure is effective in a thick film (>1 film (>1 μμmm).).

40.740.7AA at at 3T3T

IIｃｃ value increased up to 1.16 value increased up to 1.16 μμmm （（B//cB//c--axisaxis））..

0

50

100

150

200

250

0 0 .5 1 1 .5

thickness（μm ）

I c (A

)

0T

1T

3T

5T

Ｂ//c-axis

2020AA NEDO target NEDO target 20052005

7.97.9AA YBCO YBCO maxmax

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TEM of 1.8TEM of 1.8μμm thick YBCOm thick YBCO--bamboobamboo

TEM by TEM by ＪＦＣＣ　ＪＦＣＣ　KatoKato

CeO2

YBCO with BZO

a

CeO2

YBCO with BZO

The bamboo grew up vertically to the surface. The bamboo grew up vertically to the surface.

1.81.8μμmm

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Plan-view electron micrographs of Y123 with BaZrO3 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）

190

10

20

30

40

50

60

70

-45 0 45 90 135Angle(degree)

Ic (

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ZrOZrO22 doped doped ＧｄＢＣＯ（７７ＫＧｄＢＣＯ（７７Ｋ, , ３３TT））

>60A //c

Ic min >40A

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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 rateYBCO 8A *3.75m/hGdBCO >25A * 10m/hrYBCO+ Bamboo >40AGdBCO+ 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、Ic = 245A for 212.6m (IcxL=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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