M
Mamoru Hamada
Researcher at Kobe Steel
Publications - 70
Citations - 1228
Mamoru Hamada is an academic researcher from Kobe Steel. The author has contributed to research in topics: Electromagnetic coil & Superconducting magnet. The author has an hindex of 19, co-authored 68 publications receiving 1026 citations. Previous affiliations of Mamoru Hamada include National Institute for Materials Science.
Papers
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Journal ArticleDOI
Towards beyond 1 GHz NMR: Mechanism of the long-term drift of screening current-induced magnetic field in a Bi-2223 coil
Y. Koyama,Tomoaki Takao,Yoshinori Yanagisawa,Hideki Nakagome,Mamoru Hamada,Tsukasa Kiyoshi,Masato Takahashi,Hideaki Maeda +7 more
TL;DR: The screening current-induced magnetic field in the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) insert coil proposed for a beyond 1 GHz NMR spectrometer may generate a long-term field drift, resulting in a loss of field-frequency lock operation and an inability to make high resolution NMR measurements.
Journal ArticleDOI
Effect of current sweep reversal on the magnetic field stability for a Bi-2223 superconducting solenoid
Yoshinori Yanagisawa,Hideki Nakagome,Y. Koyama,R. Hu,Tomoaki Takao,Mamoru Hamada,Tsukasa Kiyoshi,Masato Takahashi,Hideaki Maeda +8 more
TL;DR: In this article, the effect of current sweep reversal on the temporal drift in magnetic field intensity for a Bi-2223 solenoid was investigated by experiment and using numerical simulation, and the current reversal formed a barrier for flux entrance at the upper and lower surface of the conductor, preventing flux creep.
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Generation of 24 T at 4.2 K using a layer-wound GdBCO insert coil with Nb3Sn and Nb–Ti external magnetic field coils
Shinji Matsumoto,Tsukasa Kiyoshi,A. Otsuka,Mamoru Hamada,Hideaki Maeda,Yoshinori Yanagisawa,Hideki Nakagome,Hiroto Suematsu +7 more
TL;DR: In this article, a layer-wound Gd-Ba-Cu-O (GdBCO) insert coil was fabricated in order to investigate its properties under a high electromagnetic force in a high magnetic field.
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Operation of a 400 MHz NMR magnet using a (RE:Rare Earth)Ba2Cu3O7−x high-temperature superconducting coil: Towards an ultra-compact super-high field NMR spectrometer operated beyond 1 GHz
Yoshinori Yanagisawa,R Piao,Seiya Iguchi,Hideki Nakagome,Tomoaki Takao,K. Kominato,Mamoru Hamada,Shinji Matsumoto,Hiroto Suematsu,Xinzhe Jin,Masato Takahashi,Toshio Yamazaki,Hideaki Maeda +12 more
TL;DR: The world's first NMR magnet comprising an inner REBCO coil and outer low-temperature superconducting (LTS) coils is developed, successfully charged without degradation and mainly operated at 400MHz (9.39T).
Journal ArticleDOI
Operation of a 500 MHz high temperature superconducting NMR: towards an NMR spectrometer operating beyond 1 GHz.
Yoshinori Yanagisawa,Hideki Nakagome,K. Tennmei,Mamoru Hamada,Masatoshi Yoshikawa,A. Otsuka,Masami Hosono,Tsukasa Kiyoshi,Masato Takahashi,Toshio Yamazaki,Hideaki Maeda +10 more
TL;DR: Based on the results of numerical simulation, the effects of screening current-induced magnetic field changes are predicted to be harmless for the 1.03 GHz NMR magnet system.