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Fujisawa, Yuita*; Krishnadas, A*; Nakamura, Tomonori*; Hsu, C.-H.*; Smith, B.*; Pardo-Almanza, M*; Hiyane, Hoshu*; Chang, G.*; Nagai, Yuki; Machida, Tadashi*; et al.
Physical Review B, 110(22), p.224511_1 - 224511_5, 2024/12
Times Cited Count：2 Percentile：23.56(Materials Science, Multidisciplinary)Understanding the nature of vortices in type-II superconductors has been vital for deepening the physics of exotic superconductors and applying superconducting materials to future electronic devices. A recent study has shown that the LiTi
O
(111) thin film offers a unique experimental platform to unveil the nature of the vortex along the curved Josephson junction. This study successfully visualized individual Josephson vortices along the curved Josephson junctions using in-situ spectroscopic scanning tunneling microscopy on LiTiO (111) epitaxial thin films. Notably, the local curvature of the Josephson junction was discovered to control the position of Josephson vortices. Furthermore, the numerical simulation reproduces the critical role of the curvature of the Josephson junction. This study provides guidelines to control Josephson vortices through geometrical ways, such as mechanical controlling of superconducting materials and their devices.
Kim, H.*; Yoshida, Yasuo*; Lee, C.-C.*; Chang, T.-R.*; Jeng, H.-T.*; Lin, H.*; Haga, Yoshinori; Fisk, Z.*; Hasegawa, Yukio*
Science Advances (Internet), 3(9), p.eeao0362_1 - eeao0362_5, 2017/09
Times Cited Count：19 Percentile：70.24(Multidisciplinary Sciences)Kojima, Atsushi; Hanada, Masaya; Jeong, S. H.*; Bae, Y. S.*; Chang, D. H.*; Kim, T. S.*; Lee, K. W.*; Park, M.*; Jung, B. K.*; Mogaki, Kazuhiko; et al.
Fusion Engineering and Design, 102, p.81 - 87, 2016/01
Times Cited Count：7 Percentile：48.01(Nuclear Science & Technology)The long-pulse acceleration of the high-power positive ion beam has been demonstrated with the JT-60 positive ion source in the joint experiment among Japan Atomic Energy Agency (JAEA), Korea Atomic Energy Research Institute (KAERI) and National Fusion Research Institute (NFRI) under the collaboration program for the development of plasma heating and current drive systems. As a result of development of the operation techniques of the ion source and facilities of the neutral beam test stand in KAERI, 2 MW 100 s beam has been achieved for the first time. The achieved beam performance satisfies the JT-60SA requirement which is designed to be a 1.94 MW ion beam power from an ion source corresponding to total neutral beam power of 20 MW with 24 ion sources. Therefore, it was found that the JT-60 positive ion sources were applicable in the JT-60SA neutral beam injectors without further modification of the ion source and the accelerator. Moreover, because this ion source is planned to be a backup ion source for KSTAR, the operational region and characteristic has been clarified to apply to the KSTAR neutral beam injector.
Hanada, Masaya; Kojima, Atsushi; Akino, Noboru; Komata, Masao; Mogaki, Kazuhiko; Oh, B. H.*; Jeong, S. H.*; Chang, D. H.*; Lee, K. W.*; Bae, Y. S.*
no journal, ,
no abstracts in English
