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/Nb 3 Sn 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 ([email protected], 10W@8K) LTS: 2 x GM/JT cryocooler ([email protected]) Shield: 2 x 1 stg GM cryocooler GM cryocoolers Single stage GM REBCO insert coil LTS coils Thermal shield Vacuum 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-#2 Single stage GM REBCO insert coil LTS coils Bypass valves #1, #2 JT valves #1, #2 Thermal shield Vacuum 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 H1 btm H1 mid H1 top 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) B meas =24.57 T z (mm) I HTS =187.8 A, I LTS =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