25T無冷媒超伝導マグネット強磁場超伝導材料研究センター

　最内層に高温超伝導を用いた無冷媒では世界最高磁場を発生する無冷媒超伝導マグネットです。52mmの室温ボアに最高 24.6T の磁場を発生させることができます。長時間安定して精密磁場を発生できる特徴を活かして，高精度測定や長時間熱処理などに威力を発揮します。

Magnets (HTS): 10.6T@188A Magnets (LTS): 14T@854A

3 CuNb/Nb3Sn Rutherford solenoids

φ300 mm x φ539 mm x h628 mm Max. hoop stress 251MPa

3 NbTi Rutherford solenoids

φ545 mm x φ712 mm x h628 mm Max. hoop stress 138 MPa

38 Ni-alloy/Bi2223 double pancakes

φ96mm x φ280 mm x h390 mm

Max. hoop stress 396 MPa

Cooling system

Conduction cooling using He circulation

HTS: 2 x 4K-GM cryocooler

(3W@4.2K, 10W@8K)

LTS: 2 x GM/JT cryocooler

(8.6W@4.3K)

Shield: 2 x 1 stg GM cryocooler

GM cryocoolers

Single

stage GM

REBCO

insert coilLTS coils

Thermal shieldVacuum vessel

Cold stage

(upper side)

Cold stage

(lower side)

Buffer tank

compressor

1st cold stage

2nd cold stage

1st heat exchanger

2nd heat exchanger

GM/JT-#1 GM/JT-#2Single

stage GM

REBCO

insert coilLTS coils

Bypass

valves

#1,

#2

JT valves #1, #2Thermal shieldVacuum vessel

0

200

400

600

800

1000

H1 (Bi2223 coil)

LTS coil

I (A

)

-3

-2

-1

0

1

2

V (V

)

2015.11.13 25T-CSM

(Bi2223 insert)

4

4.5

5

5.5

6

6.5

7

7.5

0 20 40 60 80 100 120 140 160

H1btm

H1mid

H1top

L1

L2

L3

L4

L5

T (K

)

Elasped Time (min)

0

5

10

15

20

25

30

1990 1995 2000 2005 2010 2015 2020

IMR-HFLSM

Year

Cryogen-free

Superconducting Manget

(Conduction cooling)

B (T

)

24.6T can be generated

within a 1-h energizing

time!

Most of CSMs were obtained by

the High Field Laboratory for

Superconducting Materials

(HFLSM). We achieved the

world‛ s highest magnetic field for CSMs of 24.6 T, denoted as 25

T-CSM.

10

12

14

16

18

20

22

24

26

-300 -200 -100 0 100 200 300

B (T

)

Bmeas

=24.57 T

z (mm)

IHTS

=187.8 A, ILTS

=854 A

１時間で 24.6T 磁場発生！

無冷媒超伝導マグネットの発生磁場世界記録を更新！

LTS HTS

25T Cryogen-free Superconducting Magnet