Ryoji Nagai
Ibaraki University
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Publication
Featured researches published by Ryoji Nagai.
Japanese Journal of Applied Physics | 1989
Eisuke Minehara; Ryoji Nagai; Manabu Takeuchi
The cavity made of bulk YBa2Cu3O7-d was resonant at 7 GHz in the TM010 mode without any dielectric interior. At 25 K the quality factor was measured to be just around 105 (the maximum of 2×105 by reducing microwave power) which represents an improvement by a factor of several hundreds from the normal state at 100 K.
Journal of Superconductivity | 1990
Eisuke Minehara; Ryoji Nagai; Kazutomo Hoshino; Manabu Takeuchi
After the discovery of new metal oxide superconductors with higher transition temperatures raised the possibility of a new class of superconducting microwave devices operating at temperatures well above liquid He, a feasibility study of the superconductor devices at r.f., microwave, and millimeter-wave frequencies, i.e., cavity resonator, transmission lines, waveguide, mirror, and antenna, was started at JAERI (Japan Atomic Energy Research Institute), Tokai in April 1987. In order to examine the feasibility of such devices and to investigate the nature of the superconductivity in these new superconductors, we have studied the microwave response of the oxide superconductors. In addition, we have also studied the fabrication and microwave properties of these devices using the new superconductors. We report here the status of the feasibility study, especially about the BSCCO and YBCO superconductor cavities, and the r.f. characterization apparatus using several cavity resonators. The cavities have potential applications for particle accelerators, resonant filters, ultrastable clocks, and so on.
Archive | 2014
Yoshihisa Iwashita; H. Fujisawa; H. Tongu; Ryoichi Hajima; Ryoji Nagai; Masaru Sawamura
Archive | 2002
Ryoichi Hajima; Eisuke Minehara; Ryoji Nagai; 峰原 英介; 永井 良治; 羽島 良一
Archive | 2007
Ryoji Nagai; Masaru Sawamura; 良治 永井; 勝 沢村
Particles | 2018
N. Nishimori; Ryoji Nagai; Masaru Sawamura; Ryoichi Hajima
7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 8-13, 2016 | 2016
N. Nishimori; Ryoichi Hajima; Yosuke Honda; Tsukasa Miyajima; Michiaki Mori; Ryoji Nagai; Takashi Uchiyama; Masahiro Yamamoto
Meeting abstracts of the Physical Society of Japan | 2014
N. Nishimori; Ryoji Nagai; Shunya Matsuba; Ryoichi Hajima
Archive | 2004
Eisuke Minehara; Ryoichi Hajima; Masaru Sawamura; Ryoji Nagai; N. Nishimori; Nobuhiro Kikuzawa; Toshihiko Yamauchi
Journal of Nuclear Science and Technology | 1995
Ryoji Nagai; Eisuke Minehara; Shigemi Sasaki; M. Sawamura; M. Sugimoto; Masaru Takao; Ryukou Kato; Makio Ohkubo; Yasuo Suzuki; Takashi Ikehata; Hiroshi Mase
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National Institute of Advanced Industrial Science and Technology
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