The Experts below are selected from a list of 15807 Experts worldwide ranked by ideXlab platform
Satoshi Awaji - One of the best experts on this subject based on the ideXlab platform.
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first performance test of a 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2017Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shigeru IokaAbstract:A 25 T cryogen-free Superconducting Magnet (25T-CSM) was developed and installed at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University. The 25T-CSM consists of a high-temperature Superconducting (HTS) coil and a low-temperature Superconducting (LTS) coil. A high-strength CuNb/Nb3Sn Rutherford cable with a reinforcing stabilizer CuNb composite is adopted for the middle LTS section coil. All the coils were impregnated using an epoxy resin for conduction cooling. Initially, a GdBa2Cu3O y (Gd123) coil was designed as the HTS insert coil, and then a Bi2Sr2Ca2Cu3O y (Bi2223) coil was also developed. The HTS insert and the LTS (CuNb/Nb3Sn and NbTi) outsert coils are cooled by two 4K GM and two GM/JT cryocoolers, respectively. The LTS coils successfully generated a central Magnetic field of 14 T at an operating current of 854 A without any training quench. The Gd123 coil generated 10.15 T at an operating current of 132.6 A in the absence of a background field. Subsequently, the operating current of the Gd123 insert was increased in a step-by-step manner under a background field of 14 T. The Gd123 coil could be operated up to 124.0 A stably, which corresponds to 23.55 T, but quenched at around 124.6 A (23.61 T). The Bi2223 insert coil using a Ni-alloy reinforced Bi2223 tape successfully generated 11.48 T at an operation current of 204.7A in a stand-alone test and 24.57 T in a background field of 14 T. The differences between the calculated and the measured values of the central Magnetic fields are about 0.4 T for the Gd123 insert and 0.1 T for the Bi2223 insert around 24 T.
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design and test results of a cryogenic cooling system for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: M Takahashi, Kazuo Watanabe, S Hanai, Shigeru Ioka, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, K Tasaki, H Takigami, Satoshi AwajiAbstract:A cryogenic cooling system for a 25-T cryogen-free Superconducting Magnet (25T-CSM) was developed. The 25T-CSM consisted of 11-T high-Tc Superconducting (HTS) coils and 14 T low-Tc Superconducting (LTS) coils. The HTS coils, which had about 10-W AC-loss, were cooled to about 10 K by two GM cryocoolers and a helium gas circulation unit. In this system, the gas flow rate had an optimized value and was controlled by a mass flow controller. The LTS coils were cooled to about 4 K by two GM/JT cryocoolers. Each GM/JT cryocooler had two sets of precooling gas lines. These pre-cooling lines were cooled by two single-stage GM cryocoolers and the HTS coil cooling system via a heat exchanger, between the HTS gas circulation line and the LTS cool-down line. As a result of cooling test of the 25T-CSM, the LTS coils and HTS coils were cooled from room temperature to 4.3 K and 4.6 K within 164 h (about seven days), respectively. During the excitation test of the HTS coils, their maximum temperature increased to 7.6 K, which was still sufficiently low.
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development of an 11 t bscco insert coil for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: S Hanai, Satoshi Awaji, Kazuo Watanabe, Shigeru Ioka, T Tsuchihashi, Hidetoshi OguroAbstract:We have developed and installed an 11 T Bi 2 Sr 2 Ca 2 Cu 3 O y (BSCCO) insert coil for a 25 T cryogen-free Superconducting Magnet (25 T-CSM). The insert coil composed of a stack of 38 double pancakes was wound with DI-BSCCO ™ Type HT-NX conductors which had high critical tensile strength of 400 MPa at 77 K. The insert coil is cooled by two two-stage Gifford-McMahon cryocoolers and the operation temperature of the insert coil is designed to be below 10 K. The insert coil has successfully generated 11.48 T without a background field and 24.57 T with a 14.0 T background field produced by outer low temperature Superconducting coils in a 52 mm room temperature bore. Before the performance test, we fabricated and tested an R&D insert coil consisting of two double pancakes, which had the same configuration as the actual insert coil pancakes do, to confirm mechanical strength of the conductors.
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performance of a 14 t cunb nb3sn rutherford coil with a 300 mm wide cold bore
Superconductor Science and Technology, 2016Co-Authors: H. Oguro, Satoshi Awaji, Masahiro Sugimoto, Kazuo Watanabe, S Hanai, Shigeru Ioka, H. TsubouchiAbstract:A large-bore 14-T CuNb/Nb3Sn Rutherford coil was developed for a 25 T cryogen-free Superconducting Magnet. The Magnet consisted of a low-temperature Superconducting (LTS) Magnet of NbTi and Nb3Sn Rutherford coils, and a high-temperature Superconducting Magnet. The Nb3Sn Rutherford coil was fabricated by the react-and-wind method for the first time. The LTS Magnet reached the designed operation current of 854 A without a training quench at a 1 h ramp rate. The central Magnetic field generated by the LTS Magnet was measured by a Hall sensor to be 14.0 T at 854 A in a 300 mm cold bore.
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10 t generation by an epoxy impregnated gdbco insert coil for the 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2016Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Y IijimaAbstract:A GdBa2Cu3O y (Gd123) insert coil for the 25 T cryogen-free Superconducting Magnet was constructed, installed and tested. We succeeded in the generation of 10 T using a Gd123 insert coil without a background field. The temperature of the Gd123 coil increased from 4.5 K gradually and reached about 5.5 K, when the Magnet was energized with 0.036 A/s, which corresponds to a 1 hour energizing mode. The calculated and measured central Magnetic fields are 10.61 T and 10.15 T, respectively, because of the Magnetization current effect in RE123 tape. The maximum heat load by the AC-losses estimated from the temperature rise is about 3 W, which is consistent with the slab model combined with tape stacking effect.
Kazuo Watanabe - One of the best experts on this subject based on the ideXlab platform.
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first performance test of a 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2017Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shigeru IokaAbstract:A 25 T cryogen-free Superconducting Magnet (25T-CSM) was developed and installed at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University. The 25T-CSM consists of a high-temperature Superconducting (HTS) coil and a low-temperature Superconducting (LTS) coil. A high-strength CuNb/Nb3Sn Rutherford cable with a reinforcing stabilizer CuNb composite is adopted for the middle LTS section coil. All the coils were impregnated using an epoxy resin for conduction cooling. Initially, a GdBa2Cu3O y (Gd123) coil was designed as the HTS insert coil, and then a Bi2Sr2Ca2Cu3O y (Bi2223) coil was also developed. The HTS insert and the LTS (CuNb/Nb3Sn and NbTi) outsert coils are cooled by two 4K GM and two GM/JT cryocoolers, respectively. The LTS coils successfully generated a central Magnetic field of 14 T at an operating current of 854 A without any training quench. The Gd123 coil generated 10.15 T at an operating current of 132.6 A in the absence of a background field. Subsequently, the operating current of the Gd123 insert was increased in a step-by-step manner under a background field of 14 T. The Gd123 coil could be operated up to 124.0 A stably, which corresponds to 23.55 T, but quenched at around 124.6 A (23.61 T). The Bi2223 insert coil using a Ni-alloy reinforced Bi2223 tape successfully generated 11.48 T at an operation current of 204.7A in a stand-alone test and 24.57 T in a background field of 14 T. The differences between the calculated and the measured values of the central Magnetic fields are about 0.4 T for the Gd123 insert and 0.1 T for the Bi2223 insert around 24 T.
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design and test results of a cryogenic cooling system for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: M Takahashi, Kazuo Watanabe, S Hanai, Shigeru Ioka, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, K Tasaki, H Takigami, Satoshi AwajiAbstract:A cryogenic cooling system for a 25-T cryogen-free Superconducting Magnet (25T-CSM) was developed. The 25T-CSM consisted of 11-T high-Tc Superconducting (HTS) coils and 14 T low-Tc Superconducting (LTS) coils. The HTS coils, which had about 10-W AC-loss, were cooled to about 10 K by two GM cryocoolers and a helium gas circulation unit. In this system, the gas flow rate had an optimized value and was controlled by a mass flow controller. The LTS coils were cooled to about 4 K by two GM/JT cryocoolers. Each GM/JT cryocooler had two sets of precooling gas lines. These pre-cooling lines were cooled by two single-stage GM cryocoolers and the HTS coil cooling system via a heat exchanger, between the HTS gas circulation line and the LTS cool-down line. As a result of cooling test of the 25T-CSM, the LTS coils and HTS coils were cooled from room temperature to 4.3 K and 4.6 K within 164 h (about seven days), respectively. During the excitation test of the HTS coils, their maximum temperature increased to 7.6 K, which was still sufficiently low.
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development of an 11 t bscco insert coil for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: S Hanai, Satoshi Awaji, Kazuo Watanabe, Shigeru Ioka, T Tsuchihashi, Hidetoshi OguroAbstract:We have developed and installed an 11 T Bi 2 Sr 2 Ca 2 Cu 3 O y (BSCCO) insert coil for a 25 T cryogen-free Superconducting Magnet (25 T-CSM). The insert coil composed of a stack of 38 double pancakes was wound with DI-BSCCO ™ Type HT-NX conductors which had high critical tensile strength of 400 MPa at 77 K. The insert coil is cooled by two two-stage Gifford-McMahon cryocoolers and the operation temperature of the insert coil is designed to be below 10 K. The insert coil has successfully generated 11.48 T without a background field and 24.57 T with a 14.0 T background field produced by outer low temperature Superconducting coils in a 52 mm room temperature bore. Before the performance test, we fabricated and tested an R&D insert coil consisting of two double pancakes, which had the same configuration as the actual insert coil pancakes do, to confirm mechanical strength of the conductors.
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performance of a 14 t cunb nb3sn rutherford coil with a 300 mm wide cold bore
Superconductor Science and Technology, 2016Co-Authors: H. Oguro, Satoshi Awaji, Masahiro Sugimoto, Kazuo Watanabe, S Hanai, Shigeru Ioka, H. TsubouchiAbstract:A large-bore 14-T CuNb/Nb3Sn Rutherford coil was developed for a 25 T cryogen-free Superconducting Magnet. The Magnet consisted of a low-temperature Superconducting (LTS) Magnet of NbTi and Nb3Sn Rutherford coils, and a high-temperature Superconducting Magnet. The Nb3Sn Rutherford coil was fabricated by the react-and-wind method for the first time. The LTS Magnet reached the designed operation current of 854 A without a training quench at a 1 h ramp rate. The central Magnetic field generated by the LTS Magnet was measured by a Hall sensor to be 14.0 T at 854 A in a 300 mm cold bore.
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10 t generation by an epoxy impregnated gdbco insert coil for the 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2016Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Y IijimaAbstract:A GdBa2Cu3O y (Gd123) insert coil for the 25 T cryogen-free Superconducting Magnet was constructed, installed and tested. We succeeded in the generation of 10 T using a Gd123 insert coil without a background field. The temperature of the Gd123 coil increased from 4.5 K gradually and reached about 5.5 K, when the Magnet was energized with 0.036 A/s, which corresponds to a 1 hour energizing mode. The calculated and measured central Magnetic fields are 10.61 T and 10.15 T, respectively, because of the Magnetization current effect in RE123 tape. The maximum heat load by the AC-losses estimated from the temperature rise is about 3 W, which is consistent with the slab model combined with tape stacking effect.
Shigeru Ioka - One of the best experts on this subject based on the ideXlab platform.
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first performance test of a 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2017Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shigeru IokaAbstract:A 25 T cryogen-free Superconducting Magnet (25T-CSM) was developed and installed at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University. The 25T-CSM consists of a high-temperature Superconducting (HTS) coil and a low-temperature Superconducting (LTS) coil. A high-strength CuNb/Nb3Sn Rutherford cable with a reinforcing stabilizer CuNb composite is adopted for the middle LTS section coil. All the coils were impregnated using an epoxy resin for conduction cooling. Initially, a GdBa2Cu3O y (Gd123) coil was designed as the HTS insert coil, and then a Bi2Sr2Ca2Cu3O y (Bi2223) coil was also developed. The HTS insert and the LTS (CuNb/Nb3Sn and NbTi) outsert coils are cooled by two 4K GM and two GM/JT cryocoolers, respectively. The LTS coils successfully generated a central Magnetic field of 14 T at an operating current of 854 A without any training quench. The Gd123 coil generated 10.15 T at an operating current of 132.6 A in the absence of a background field. Subsequently, the operating current of the Gd123 insert was increased in a step-by-step manner under a background field of 14 T. The Gd123 coil could be operated up to 124.0 A stably, which corresponds to 23.55 T, but quenched at around 124.6 A (23.61 T). The Bi2223 insert coil using a Ni-alloy reinforced Bi2223 tape successfully generated 11.48 T at an operation current of 204.7A in a stand-alone test and 24.57 T in a background field of 14 T. The differences between the calculated and the measured values of the central Magnetic fields are about 0.4 T for the Gd123 insert and 0.1 T for the Bi2223 insert around 24 T.
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design and test results of a cryogenic cooling system for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: M Takahashi, Kazuo Watanabe, S Hanai, Shigeru Ioka, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, K Tasaki, H Takigami, Satoshi AwajiAbstract:A cryogenic cooling system for a 25-T cryogen-free Superconducting Magnet (25T-CSM) was developed. The 25T-CSM consisted of 11-T high-Tc Superconducting (HTS) coils and 14 T low-Tc Superconducting (LTS) coils. The HTS coils, which had about 10-W AC-loss, were cooled to about 10 K by two GM cryocoolers and a helium gas circulation unit. In this system, the gas flow rate had an optimized value and was controlled by a mass flow controller. The LTS coils were cooled to about 4 K by two GM/JT cryocoolers. Each GM/JT cryocooler had two sets of precooling gas lines. These pre-cooling lines were cooled by two single-stage GM cryocoolers and the HTS coil cooling system via a heat exchanger, between the HTS gas circulation line and the LTS cool-down line. As a result of cooling test of the 25T-CSM, the LTS coils and HTS coils were cooled from room temperature to 4.3 K and 4.6 K within 164 h (about seven days), respectively. During the excitation test of the HTS coils, their maximum temperature increased to 7.6 K, which was still sufficiently low.
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development of an 11 t bscco insert coil for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: S Hanai, Satoshi Awaji, Kazuo Watanabe, Shigeru Ioka, T Tsuchihashi, Hidetoshi OguroAbstract:We have developed and installed an 11 T Bi 2 Sr 2 Ca 2 Cu 3 O y (BSCCO) insert coil for a 25 T cryogen-free Superconducting Magnet (25 T-CSM). The insert coil composed of a stack of 38 double pancakes was wound with DI-BSCCO ™ Type HT-NX conductors which had high critical tensile strength of 400 MPa at 77 K. The insert coil is cooled by two two-stage Gifford-McMahon cryocoolers and the operation temperature of the insert coil is designed to be below 10 K. The insert coil has successfully generated 11.48 T without a background field and 24.57 T with a 14.0 T background field produced by outer low temperature Superconducting coils in a 52 mm room temperature bore. Before the performance test, we fabricated and tested an R&D insert coil consisting of two double pancakes, which had the same configuration as the actual insert coil pancakes do, to confirm mechanical strength of the conductors.
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performance of a 14 t cunb nb3sn rutherford coil with a 300 mm wide cold bore
Superconductor Science and Technology, 2016Co-Authors: H. Oguro, Satoshi Awaji, Masahiro Sugimoto, Kazuo Watanabe, S Hanai, Shigeru Ioka, H. TsubouchiAbstract:A large-bore 14-T CuNb/Nb3Sn Rutherford coil was developed for a 25 T cryogen-free Superconducting Magnet. The Magnet consisted of a low-temperature Superconducting (LTS) Magnet of NbTi and Nb3Sn Rutherford coils, and a high-temperature Superconducting Magnet. The Nb3Sn Rutherford coil was fabricated by the react-and-wind method for the first time. The LTS Magnet reached the designed operation current of 854 A without a training quench at a 1 h ramp rate. The central Magnetic field generated by the LTS Magnet was measured by a Hall sensor to be 14.0 T at 854 A in a 300 mm cold bore.
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10 t generation by an epoxy impregnated gdbco insert coil for the 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2016Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Y IijimaAbstract:A GdBa2Cu3O y (Gd123) insert coil for the 25 T cryogen-free Superconducting Magnet was constructed, installed and tested. We succeeded in the generation of 10 T using a Gd123 insert coil without a background field. The temperature of the Gd123 coil increased from 4.5 K gradually and reached about 5.5 K, when the Magnet was energized with 0.036 A/s, which corresponds to a 1 hour energizing mode. The calculated and measured central Magnetic fields are 10.61 T and 10.15 T, respectively, because of the Magnetization current effect in RE123 tape. The maximum heat load by the AC-losses estimated from the temperature rise is about 3 W, which is consistent with the slab model combined with tape stacking effect.
S Hanai - One of the best experts on this subject based on the ideXlab platform.
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first performance test of a 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2017Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shigeru IokaAbstract:A 25 T cryogen-free Superconducting Magnet (25T-CSM) was developed and installed at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University. The 25T-CSM consists of a high-temperature Superconducting (HTS) coil and a low-temperature Superconducting (LTS) coil. A high-strength CuNb/Nb3Sn Rutherford cable with a reinforcing stabilizer CuNb composite is adopted for the middle LTS section coil. All the coils were impregnated using an epoxy resin for conduction cooling. Initially, a GdBa2Cu3O y (Gd123) coil was designed as the HTS insert coil, and then a Bi2Sr2Ca2Cu3O y (Bi2223) coil was also developed. The HTS insert and the LTS (CuNb/Nb3Sn and NbTi) outsert coils are cooled by two 4K GM and two GM/JT cryocoolers, respectively. The LTS coils successfully generated a central Magnetic field of 14 T at an operating current of 854 A without any training quench. The Gd123 coil generated 10.15 T at an operating current of 132.6 A in the absence of a background field. Subsequently, the operating current of the Gd123 insert was increased in a step-by-step manner under a background field of 14 T. The Gd123 coil could be operated up to 124.0 A stably, which corresponds to 23.55 T, but quenched at around 124.6 A (23.61 T). The Bi2223 insert coil using a Ni-alloy reinforced Bi2223 tape successfully generated 11.48 T at an operation current of 204.7A in a stand-alone test and 24.57 T in a background field of 14 T. The differences between the calculated and the measured values of the central Magnetic fields are about 0.4 T for the Gd123 insert and 0.1 T for the Bi2223 insert around 24 T.
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design and test results of a cryogenic cooling system for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: M Takahashi, Kazuo Watanabe, S Hanai, Shigeru Ioka, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, K Tasaki, H Takigami, Satoshi AwajiAbstract:A cryogenic cooling system for a 25-T cryogen-free Superconducting Magnet (25T-CSM) was developed. The 25T-CSM consisted of 11-T high-Tc Superconducting (HTS) coils and 14 T low-Tc Superconducting (LTS) coils. The HTS coils, which had about 10-W AC-loss, were cooled to about 10 K by two GM cryocoolers and a helium gas circulation unit. In this system, the gas flow rate had an optimized value and was controlled by a mass flow controller. The LTS coils were cooled to about 4 K by two GM/JT cryocoolers. Each GM/JT cryocooler had two sets of precooling gas lines. These pre-cooling lines were cooled by two single-stage GM cryocoolers and the HTS coil cooling system via a heat exchanger, between the HTS gas circulation line and the LTS cool-down line. As a result of cooling test of the 25T-CSM, the LTS coils and HTS coils were cooled from room temperature to 4.3 K and 4.6 K within 164 h (about seven days), respectively. During the excitation test of the HTS coils, their maximum temperature increased to 7.6 K, which was still sufficiently low.
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development of an 11 t bscco insert coil for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: S Hanai, Satoshi Awaji, Kazuo Watanabe, Shigeru Ioka, T Tsuchihashi, Hidetoshi OguroAbstract:We have developed and installed an 11 T Bi 2 Sr 2 Ca 2 Cu 3 O y (BSCCO) insert coil for a 25 T cryogen-free Superconducting Magnet (25 T-CSM). The insert coil composed of a stack of 38 double pancakes was wound with DI-BSCCO ™ Type HT-NX conductors which had high critical tensile strength of 400 MPa at 77 K. The insert coil is cooled by two two-stage Gifford-McMahon cryocoolers and the operation temperature of the insert coil is designed to be below 10 K. The insert coil has successfully generated 11.48 T without a background field and 24.57 T with a 14.0 T background field produced by outer low temperature Superconducting coils in a 52 mm room temperature bore. Before the performance test, we fabricated and tested an R&D insert coil consisting of two double pancakes, which had the same configuration as the actual insert coil pancakes do, to confirm mechanical strength of the conductors.
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performance of a 14 t cunb nb3sn rutherford coil with a 300 mm wide cold bore
Superconductor Science and Technology, 2016Co-Authors: H. Oguro, Satoshi Awaji, Masahiro Sugimoto, Kazuo Watanabe, S Hanai, Shigeru Ioka, H. TsubouchiAbstract:A large-bore 14-T CuNb/Nb3Sn Rutherford coil was developed for a 25 T cryogen-free Superconducting Magnet. The Magnet consisted of a low-temperature Superconducting (LTS) Magnet of NbTi and Nb3Sn Rutherford coils, and a high-temperature Superconducting Magnet. The Nb3Sn Rutherford coil was fabricated by the react-and-wind method for the first time. The LTS Magnet reached the designed operation current of 854 A without a training quench at a 1 h ramp rate. The central Magnetic field generated by the LTS Magnet was measured by a Hall sensor to be 14.0 T at 854 A in a 300 mm cold bore.
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10 t generation by an epoxy impregnated gdbco insert coil for the 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2016Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Y IijimaAbstract:A GdBa2Cu3O y (Gd123) insert coil for the 25 T cryogen-free Superconducting Magnet was constructed, installed and tested. We succeeded in the generation of 10 T using a Gd123 insert coil without a background field. The temperature of the Gd123 coil increased from 4.5 K gradually and reached about 5.5 K, when the Magnet was energized with 0.036 A/s, which corresponds to a 1 hour energizing mode. The calculated and measured central Magnetic fields are 10.61 T and 10.15 T, respectively, because of the Magnetization current effect in RE123 tape. The maximum heat load by the AC-losses estimated from the temperature rise is about 3 W, which is consistent with the slab model combined with tape stacking effect.
Hidetoshi Oguro - One of the best experts on this subject based on the ideXlab platform.
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first performance test of a 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2017Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shigeru IokaAbstract:A 25 T cryogen-free Superconducting Magnet (25T-CSM) was developed and installed at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University. The 25T-CSM consists of a high-temperature Superconducting (HTS) coil and a low-temperature Superconducting (LTS) coil. A high-strength CuNb/Nb3Sn Rutherford cable with a reinforcing stabilizer CuNb composite is adopted for the middle LTS section coil. All the coils were impregnated using an epoxy resin for conduction cooling. Initially, a GdBa2Cu3O y (Gd123) coil was designed as the HTS insert coil, and then a Bi2Sr2Ca2Cu3O y (Bi2223) coil was also developed. The HTS insert and the LTS (CuNb/Nb3Sn and NbTi) outsert coils are cooled by two 4K GM and two GM/JT cryocoolers, respectively. The LTS coils successfully generated a central Magnetic field of 14 T at an operating current of 854 A without any training quench. The Gd123 coil generated 10.15 T at an operating current of 132.6 A in the absence of a background field. Subsequently, the operating current of the Gd123 insert was increased in a step-by-step manner under a background field of 14 T. The Gd123 coil could be operated up to 124.0 A stably, which corresponds to 23.55 T, but quenched at around 124.6 A (23.61 T). The Bi2223 insert coil using a Ni-alloy reinforced Bi2223 tape successfully generated 11.48 T at an operation current of 204.7A in a stand-alone test and 24.57 T in a background field of 14 T. The differences between the calculated and the measured values of the central Magnetic fields are about 0.4 T for the Gd123 insert and 0.1 T for the Bi2223 insert around 24 T.
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development of an 11 t bscco insert coil for a 25 t cryogen free Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2017Co-Authors: S Hanai, Satoshi Awaji, Kazuo Watanabe, Shigeru Ioka, T Tsuchihashi, Hidetoshi OguroAbstract:We have developed and installed an 11 T Bi 2 Sr 2 Ca 2 Cu 3 O y (BSCCO) insert coil for a 25 T cryogen-free Superconducting Magnet (25 T-CSM). The insert coil composed of a stack of 38 double pancakes was wound with DI-BSCCO ™ Type HT-NX conductors which had high critical tensile strength of 400 MPa at 77 K. The insert coil is cooled by two two-stage Gifford-McMahon cryocoolers and the operation temperature of the insert coil is designed to be below 10 K. The insert coil has successfully generated 11.48 T without a background field and 24.57 T with a 14.0 T background field produced by outer low temperature Superconducting coils in a 52 mm room temperature bore. Before the performance test, we fabricated and tested an R&D insert coil consisting of two double pancakes, which had the same configuration as the actual insert coil pancakes do, to confirm mechanical strength of the conductors.
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10 t generation by an epoxy impregnated gdbco insert coil for the 25 t cryogen free Superconducting Magnet
Superconductor Science and Technology, 2016Co-Authors: Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Hiroshi Miyazaki, Taizo Tosaka, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Y IijimaAbstract:A GdBa2Cu3O y (Gd123) insert coil for the 25 T cryogen-free Superconducting Magnet was constructed, installed and tested. We succeeded in the generation of 10 T using a Gd123 insert coil without a background field. The temperature of the Gd123 coil increased from 4.5 K gradually and reached about 5.5 K, when the Magnet was energized with 0.036 A/s, which corresponds to a 1 hour energizing mode. The calculated and measured central Magnetic fields are 10.61 T and 10.15 T, respectively, because of the Magnetization current effect in RE123 tape. The maximum heat load by the AC-losses estimated from the temperature rise is about 3 W, which is consistent with the slab model combined with tape stacking effect.
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design of a cooling system for a rebco insert coil in a cryogen free 25 t Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2015Co-Authors: Sadanori Iwai, Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, M Takahashi, Hiroshi Miyazaki, Taizo Tosaka, K Tasaki, Hidetoshi OguroAbstract:A cryogen-free 20 T Superconducting Magnet with a 52 mm room-temperature bore was developed and installed in Tohoku University in 2013. This Magnet consists of a Bi2223 insert coil, which generates 4.5 T, and outer low-temperature Superconducting (LTS) coils. Both coils were cooled by a GM/JT cryocooler with 4.2 W-class cooling capacity at 4.3 K. To generate a higher Magnetic field, a new cryogen-free 25 T Superconducting Magnet using a REBCO insert coil, which generates 11.5 T, and new outer LTS coils is now under development. The Magnetic field contribution of this REBCO insert coil is considerably higher than that of the previous Bi2223 insert coil, and the ac-loss of the insert coil during field ramping rises to approximately 9.7 W. The LTS coils have to operate at about 4 K, but the REBCO coil can operate at various temperatures above 4 K. In addition, the cooling capacity of a GM cryocooler is greater than that of a GM/JT cryocooler around 10 K. Thus, the REBCO insert coil is cooled to about 10 K by using two GM cryocoolers, independently of the LTS coils, which are cooled by two GM/JT cryocoolers. To protect the cryocoolers from the leakage field of the Magnet, the two GM cryocoolers cool circulating helium gas through heat exchangers, and the gas is transported over a long distance to another heat exchanger provided for the REBCO insert coil. The maximum temperature of the REBCO insert coil was calculated under the most severe condition where an insert coil ac-loss of 9.7 W was generated continuously. And it was confirmed to be less than the target maximum temperature of 12 K.
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design of ybco insert coil for a cryogen free 22 t Superconducting Magnet
IEEE Transactions on Applied Superconductivity, 2014Co-Authors: Hiroshi Miyazaki, Satoshi Awaji, Kazuo Watanabe, S Hanai, Shigeru Ioka, Sadanori Iwai, Taizo Tosaka, K Tasaki, Hidetoshi Oguro, Shinji FujitaAbstract:A YBCO insert coil has been developed for upgrading a cryogen-free 18 T Superconducting Magnet installed in the High Field Laboratory for Superconducting Materials (HFLSM) at Tohoku University to a 22 T Superconducting Magnet. The YBCO insert coil is designed to generate 6.5 T at 200 A in 15.5 T outer LTS coils. The YBCO insert coil is composed of a stack of 50 single pancake coils wound with YBCO-coated conductors (0.23 mm × 4 mm). The inner and outer diameters of the YBCO insert coil are 96 mm and 178 mm, respectively, and the total conductor length is about 3 km. The maximum hoop stress of the YBCO insert coil was estimated to be 310 MPa when the central Magnetic field was 22 T. The Magnet system is cooled by a GM/JT cryocooler and two single-stage GM cryocoolers. Thermal runaway may cause burnout of the YBCO insert coil, and therefore, it is important to calculate the voltage-current characteristics of the coil from the Superconducting properties of the YBCO-coated conductors. The coil should have no damaged area in the windings because a damaged area would generate heat locally, eventually resulting in thermal runaway. Therefore, a demonstration coil with almost the same size as the pancake coils used for the YBCO insert coil was fabricated and tested in conduction cooling conditions in order to evaluate whether the coil could withstand the thermal stresses and electroMagnetic force.
