Article
Engineering, Electrical & Electronic
Xiaobo Ma, Shengnan Zhang, Jianqing Feng, Chengshan Li, Botao Shao, Jianfeng Li
Summary: Mono-filament Bi-2223/Ag and Bi-2223/AgAu tapes were fabricated using the power-in tube technique. The formation temperature and content of Bi-2223 phase in the tapes were analyzed. The growth process of Bi-2223 grains during the sintering process was quantitatively studied, and it was found that the growth rate in the length direction was higher than in the thickness direction. The results provided important insights for understanding the growth of Bi-2223 phase and improving the current-carrying property of the tapes.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kohki Takahashi, Tatsunori Okada, Arnaud Badel, Satoshi Awaji, Hiroshi Miyazaki, Satoshi Hanai, Shigeru Ioka
Summary: The upgrading of the 25T cryogen-free superconducting magnet to a 30T-class magnet using REBCO coils is being considered. The strategy involves adopting a two tapes co-winding technique to increase the current density and prevent hotspot generation. Electromagnetic and mechanical properties of two bundle co-wound pancake coils were investigated as part of the R&D process for the 30T-class superconducting magnet.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Multidisciplinary Sciences
Sumit Tewari, Andrew Webb
Summary: In this article, the applicability of the Halbach magnetization rotation rule in elliptical or other non-circular cross-sections is studied. It is shown that a numerically optimized magnetization rotation rule can significantly improve the field homogeneity compared to a Halbach configuration. The study also demonstrates the use of a permanent magnet hypothesis for deriving the optimized magnetization rules based on virtual permanent magnets of similar cross-section.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Shuangsong Du, Kaizhong Ding, Changle Feng, Rui Hu, Yuntao Song, YongHua Chen, Yanfang Bi, Hansheng Feng, Chunlong Zou
Summary: This study investigated the stress conditions of the coil for the 240MeV superconducting isochronous cyclotron under various conditions, with results showing that the hoop stress does not exceed the allowable limit, providing sufficient safety margin for the hoop stress compared to the previous model.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Applied
Yufan Yan, Peng Song, Canjie Xin, Mingzhi Guan, Yi Li, Huajun Liu, Timing Qu
Summary: This paper investigates the mechanical strain induced by screening currents in REBCO coils, showing that moderate over-banding structures are effective in providing reinforcements for the superconductors. Additionally, a new edge-bonding method was proposed to reduce hoop strains in low applied fields.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Review
Physics, Applied
Arno Godeke
Summary: As the magnetic fields generated by superconducting magnets continue to increase, the limitations of low-temperature superconductors and the limited supply of helium as a coolant are becoming significant factors. Therefore, studying the application of high-temperature superconductors in superconducting magnets has become increasingly important.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Gen Nishijima, Munenori Amaya, Takashi Nishimura, Koji Kamiya, Takenori Numazawa
Summary: We have begun developing a magnetic refrigeration system for hydrogen liquefaction. The system includes a superconducting magnet with an active magnetic regenerative (AMR) bed. To study its suitability for the magnetic refrigeration system, a Bi-2223 superconducting magnet with compensation coils at both ends was designed and made. The magnet was designed to generate 4.76 T at a rated current of 300 A, and the compensation coils reduce the magnetic field outside the bore to zero. The magnet was fabricated using epoxy-impregnated double-pancake coils, and the cooling time for the magnet was approximately 82 hours. However, the power supply was stopped at 229 A (3.63 T) due to voltage oscillations in the coils, possibly caused by compression from the magnetic repulsive force.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Review
Medicine, Legal
Thomas Castaing-Cordier, Virginie Ladroue, Fabrice Besacier, Audrey Bulete, Denis Jacquemin, Patrick Giraudeau, Jonathan Farjon
Summary: This article discusses the application of NMR in the characterization of NPS, highlighting the importance of high field NMR methods and emerging benchtop NMR approaches for structural elucidation and quantification. It points out that despite the resolution and sensitivity gap compared to high field NMR, benchtop NMR can serve as valuable alternatives in the field of forensics.
FORENSIC SCIENCE INTERNATIONAL
(2021)
Article
Computer Science, Information Systems
Liangjun Shao, Peng Song, Yufan Yan, Xintao Zhang, Mianjun Xiao, Fang Liu, Huajun Liu, Timing Qu
Summary: In this study, we numerically investigated the screening current-induced strain in REBCO coils using a coupled electromagnetic-mechanical model. The results showed that the screening current-induced strain calculated with the coupled model was lower than that calculated with the sequential model. Additionally, the outermost pancake of each coil was estimated to be the most critical one, and there was a relationship between the critical current value and the screening current-induced strain.
Article
Engineering, Electrical & Electronic
S. Fujita, S. Muto, W. Hirata, K. Tsuchiya, Y. Iijima, M. Daibo, K. Takahashi, K. Sakai, S. Awaji
Summary: This study investigated the tolerance of REBCO coil to electromagnetic force by applying hoop stresses and found degradation only occurred at the lap joint between CCs. A new joint structure was proposed to reduce stress concentration at the joint part, with higher tensile strength compared to traditional lap joint structure.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Applied
Wooseung Lee, Dongkeun Park, Juan Bascunan, Yukikazu Iwasa
Summary: In this research, a high-field REBCO nuclear magnetic resonance benchtop instrument was constructed and tested. The instrument utilized an all-REBCO, conduction-cooled magnet design and achieved improved performance through the application of an extreme no-insulation winding technique and a temperature-controlled charging sequence.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Nawres J. Al-Ramahi, Roberts Joffe, Janis Varna
Summary: An alternative method based on maximum hoop stress analysis is demonstrated for predicting crack propagation direction in the adhesive layer of bonded stiff materials, avoiding the need for extensive computational resources. Validation is done using fracture mechanics approach, followed by a parametric study on factors influencing crack propagation.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Ceramics
Marwa H. El Makdah, Nour El Ghouch, Mohammad H. El-Dakdouki, R. Awad, M. Matar
Summary: The effect of adding yttrium iron garnet (YIG) nanoparticles on the (Bi1.8Pb0.4)Sr2Ca2.1Cu3.2Oy ((Bi,Pb)-2223) superconductor was investigated. The synthesis of nano-(YIG)x/(Bi,Pb)-2223 composites was done using the solid-state reaction technique. X-ray diffraction confirmed the formation of (Bi,Pb)-2223 as the major phase. The addition of nano-YIG increased the oxygen content in the CuO2 planes and improved the critical transition temperature (Tc) and critical current density (Jc).
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
K. Takahashi, A. Badel, T. Okada, S. Awaji, H. Miyazaki, S. Hanai, S. Ioka
Summary: This article describes the plan to upgrade the 25T cryogen-free superconducting magnet to a 30T magnet at the High Field Laboratory for Superconducting Materials, Tohoku University. A robust coil concept with REBCO coils was adopted and tested for its effectiveness through stress tests and performance evaluation.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Multidisciplinary Sciences
Qidi Wang, Chenglong Zhao, Jianlin Wang, Zhenpeng Yao, Shuwei Wang, Sai Govind Hari Kumar, Swapna Ganapathy, Stephen Eustace, Xuedong Bai, Baohua Li, Marnix Wagemaker
Summary: High-entropy alloys/compounds with increased configurational entropy exhibit improved functional properties compared to conventional materials. In this study, the impact of increasing entropy in liquid electrolytes for rechargeable lithium batteries was demonstrated. The introduction of multiple salts in the electrolyte induced a larger diversity in solvation structures, enhancing lithium-ion diffusivity and the formation of stable interphase passivation layers. A low-concentration dimethyl ether electrolyte with four salts showed enhanced cycling stability and rate capability. These findings highlight the potential of high-entropy electrolytes for lithium batteries and beyond.
NATURE COMMUNICATIONS
(2023)
Article
Thermodynamics
T. Matsuda, T. Okamura, M. Hamada, S. Matsumoto, T. Ueno, R. Piao, Y. Yanagisawa, H. Maeda
Article
Engineering, Electrical & Electronic
Yasuyuki Miyoshi, Kazuyoshi Saito, Mamoru Hamada, Shinji Matsumoto, Gen Nishijima, Ryusuke Nakasaki, Akinobu Nakai, Hisaki Sakamoto, Shinichi Mukoyama
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2018)
Article
Engineering, Electrical & Electronic
Su-Hun Kim, Se-Hee Lee, Dipak Patel, Seyong Choi
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2018)
Article
Physics, Applied
Jun Hyuk Choi, Dong Gun Lee, Ju Heum Jeon, Ee Joo Lee, Minoru Maeda, Seyong Choi
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2019)
Article
Physics, Applied
Dipak Patel, Wenbin Qiu, Mislav Mustapic, Jonathan C. Knott, Zongqing Ma, Daniel Gajda, Mohammed Shahabuddin, Jianyi Xu, Seyong Choi, Mike Tomsic, Shi Xue Dou, Yusuke Yamauchi, Jung Ho Kim, Md Shahriar Al Hossain
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2018)
Article
Physics, Multidisciplinary
Seong Jun Kim, Jin Yong Park, Byoung-Seob Lee, Jonggi Hong, Mi-Sook Won, Jung-Woo Ok, Seyong Choi
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2018)
Article
Chemistry, Physical
Minoru Maeda, Seyong Choi
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Engineering, Electrical & Electronic
Renzhong Piao, Yasuyuki Miyoshi, Masatoshi Yoshikawa, Kazuyoshi Saito, Mamoru Hamada, Shinji Matsumoto, Hiroto Suematsu, Hiroki Mochida, Tomoaki Takao, Yu Suetomi, Masato Takahashi, Hideaki Maeda, Yoshinori Yanagisawa
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2019)
Article
Engineering, Electrical & Electronic
Shinji Matsumoto, Gen Nishijima, Akinobu Nakai, Hisaki Sakamoto, Shinich Mukoyama, Yasuyuki Miyoshi, Kazuyoshi Saito, Mamoru Hamada
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2019)
Article
Engineering, Electrical & Electronic
Gen Nishijima, Shinji Matsumoto, Akinobu Nakai, Hisaki Sakamoto, Shinichi Mukoyama, Yasuyuki Miyoshi, Kazuyoshi Saito, Mamoru Hamada
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2019)
Article
Multidisciplinary Sciences
Dipak Patel, Su-Hun Kim, Wenbin Qiu, Minoru Maeda, Akiyoshi Matsumoto, Gen Nishijima, Hiroaki Kumakura, Seyong Choi, Jung Ho Kim
SCIENTIFIC REPORTS
(2019)
Article
Nanoscience & Nanotechnology
Dipak Patel, Akiyoshi Matsumoto, Hiroaki Kumakura, Gen Nishijima, Minoru Maeda, Su-Hun Kim, Seyong Choi, Jung Ho Kim
SCRIPTA MATERIALIA
(2020)
Article
Physics, Applied
Su-Hun Kim, Dipak Patel, Minoru Maeda, Minhee Kim, Se-Hee Lee, Seyong Choi, Jung Ho Kim
Summary: The research focuses on improving the interconnection between multifilamentary wires in MgB2 magnets through a unique superconducting joint technique, resulting in high critical current and potential application in magnetic resonance imaging systems.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Su-Hun Kim, Dipak Patel, Yeundae Jeong, Minhee Kim, Se-Hee Lee, Jung Ho Kim, Seyong Choi
Summary: In this study, a 7 T superconducting magnet capable of persistent-mode operation was designed, fabricated, and evaluated. The magnet showed promising results in terms of magnetic field uniformity and electron beam compression, confirming its suitability for cryogenic electron beam ion sources.
Article
Materials Science, Multidisciplinary
Dipak Patel, Akiyoshi Matsumoto, Hiroaki Kumakura, Minoru Maeda, Su-Hun Kim, Md Shahriar Al Hossain, Seyong Choi, Jung Ho Kim
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
