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Journal Articles

Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-$$T_{rm c}$$ superconductors

Sueyoshi, Tetsuro*; Enokihata, Ryusei*; Hidaka, Yuka*; Irie, Masahiro*; Fujiyoshi, Takanori*; Okuno, Yasuki*; Ishikawa, Norito

Physica C, 582, p.1353824_1 - 1353824_5, 2021/03

https://doi.org/10.1016/j.physc.2021.1353824
 Times Cited Count：1 Percentile：7.51(Physics, Applied)

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa$$_{2}$$Cu$$_{3}$$Oy thin films, where CDs parallel to the $$c$$-axis and CDs crossing at $$pm$$$$theta$$ ($$theta$$=45$$^{circ}$$, 60$$^{circ}$$ and 80$$^{circ}$$) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with $$theta$$$$leqq$$$$pm$$60$$^{circ}$$ form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the $$c$$-axis, whereas the Jc shows no peaks around the crossing angles of $$pm$$$$theta$$. When the crossing angle is expanded to $$theta$$=$$pm$$80$$^{circ}$$, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of $$J_{rm c}$$ around B//c. We also demonstrated that the combined configuration consisting of CDs at $$theta$$= 0$$^{circ}$$, $$pm$$45$$^{circ}$$, $$pm$$60$$^{circ}$$ and $$pm$$80$$^{circ}$$ provides a uniform enhancement of $$J_{rm c}$$ over a wide angular-region.

JAEA Reports

Summary of instructor training program in FY2014 aiming at Asian countries introducing nuclear technologies for peaceful use (Contract program)

Hidaka, Akihide; Nakano, Yoshihiro; Watanabe, Yoko; Arai, Nobuyoshi; Sawada, Makoto; Kanaizuka, Seiichi*; Katogi, Aki; Shimada, Mayuka*; Ishikawa, Tomomi*; Ebine, Masako*; et al.

JAEA-Review 2016-011, 208 Pages, 2016/07

JAEA-Review-2016-011-01.pdf:33.85MB
JAEA-Review-2016-011-02.pdf:27.68MB

JAEA has been conducting the Instructor Training Program (ITP) since 1996 under the auspices of MEXT to contribute to human resource development in currently 11 Asian countries in the field of radiation utilization for seeking peaceful use of nuclear energy. ITP consists of Instructor Training Course (ITC), Follow-up Training Course (FTC) and Nuclear Technology Seminars. In the ITP, trainings or seminars relating to technology for nuclear utilization are held in Japan by inviting nuclear related people from Asian countries to Japan and after that, the past trainees are supported during FTC by dispatching Japanese specialists to Asian countries. News Letter is also prepared to provide the broad range of information obtained through the trainings for local people near NPPs in Japan. The present report describes the activities of FY2014 ITP and future challenges for improving ITP more effectively.

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