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Journal Articles

Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe$$_{13}$$ probed by static dc magnetization measurements

Shimizu, Yusei*; Haga, Yoshinori; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Physical Review B, 93(2), p.024502_1 - 024502_8, 2016/01

 Times Cited Count:7 Percentile:38.57(Materials Science, Multidisciplinary)

Journal Articles

Study on magnetic property change on neutron irradiated austenitic stainless steel

Nemoto, Yoshiyuki; Oishi, Makoto; Ito, Masayasu; Kaji, Yoshiyuki

Nihon Hozen Gakkai Dai-12-Kai Gakujutsu Koenkai Yoshishu, p.105 - 112, 2015/07

Authors previously reported that Eddy current method and AC magnetization method have potential to be applied for development of diagnostic technics to detect the sign of material degradation before cracking on the austenitic stainless steels used as structural material in nuclear power plants. In typical austenitic stainless steels such as type304, magnetic ferrite phase would exist in the alloy before irradiation, and it is concerned to disturb the magnetic measurement on irradiated material. Magnetic measurements were conducted in this work on type304 austenitic stainless steel specimens irradiated up to different doses. In addition, microstructure observation was conducted on the area including grain boundary to discuss the correlation of magnetization on irradiated austenitic stainless alloy and grain boundary cracking. Obtained magnetic data on irradiated type304 stainless steel were seen clearly different from that on un-irradiated specimen, and showed positive correlation with radiation dose, therefore it was thought that magnetic measurement technics can be applied for the material which contains certain quantity of ferrite phase before irradiation. In the microstructural observation, magnetic phase (FeNi$$_{3}$$) formation along the grain boundary was revealed.

Journal Articles

Fabrication of 8Cr-2W ferritic steel tile for reduction in toroidal magnetic field ripple on JT-60U

Kudo, Yusuke; Sawai, Tomotsugu; Sakurai, Shinji; Masaki, Kei; Suzuki, Yutaka; Sasajima, Tadayuki; Hayashi, Takao; Takahashi, Ryukichi*; Honda, Masao; Jitsukawa, Shiro; et al.

Journal of the Korean Physical Society, 49(96), p.S297 - S301, 2006/12

Installation of ferritic steel tiles was proposed in JT-60U to reduce the toroidal magnetic field ripple and to improve the fast ion loss, which degrades heating efficiency and increases heat load on plasma facing component under large volume plasma operations. We selected a 8Cr-2W-0.2V ferritic steel with the cost-effectiveness, in which concentration limits of activation elements in F82H were relaxed because of the less number of neutron generations from deuterium operations on JT-60U. The fabricated ferritic steel has clear tempered martensitic microstructure, and sufficient magnetic and mechanical properties. The saturated magnetization was estimated to 1.7 Tesla at 573 K, lower than expected, but effectiveness in JT-60U was confirmed by numerical analyses. To research the effect of material conditions, such as microstructure and heat treatment, on saturated magnetization of the ferritic steel based on 8-9Cr is important for the future fusion reactors which will be planned to install the ferritic steel as the in-vessel components.

Journal Articles

Single crystal growth and anisotropic superconducting property of PuRhGa$$_5$$

Haga, Yoshinori; Aoki, Dai*; Matsuda, Tatsuma; Nakajima, Kunihisa; Arai, Yasuo; Yamamoto, Etsuji; Nakamura, Akio; Homma, Yoshiya*; Shiokawa, Yoshinobu; Onuki, Yoshichika

Journal of the Physical Society of Japan, 74(6), p.1698 - 1701, 2005/06

 Times Cited Count:46 Percentile:83.85(Physics, Multidisciplinary)

Single crystals of Pu-based superconductor PuRhGa$$_5$$ have been successfully grown. Magnetization and AC susceptibility measurements were performed to investigate anisotropic magnetic and superconducting properties. Although the paramagnetic susceptibility in the normal state is isotropic, large anisotropy in the superconducting upper critical field is observed. This suggests that the effective mass of the conduction electrons along [001] is 4 times larger than that for [100].

JAEA Reports

Development of FEMAG; Calculation code of magnetic field generated by ferritic plates in the tokamak devices

Urata, Kazuhiro*

JAERI-Data/Code 2003-005, 36 Pages, 2003/03

JAERI-Data-Code-2003-005.pdf:2.96MB

In design of the fusion devises in which ferritic steel is planned to use as the plasma facing material and/or the inserts for ripple reduction, the appreciation of the error field effect and the optimization of ferritic plate arrangement to reduce the toroidal field ripple require calculation of ferritic magnetic field. However iterative calculations by the non-linearity in B-H curve disturbs high-speed calculation. In the strong toroidal magnetic field in the tokamak, fully magnetic saturation of ferritic steel occurs. Hence a distribution of magnetic charges as magnetic field source is determined straightforward. Additionally objective ferritic steel geometry is limited to the thin plate and they are installed along the toroidal magnetic field. Taking them into account, high-speed calculation code FEMAG has been developed. In this report, the formalization of FEMAG, how to use FEMAG, and the validity check in comparison with a 3D FEM code, with the measurements of the magnetic field in JFT-2M are described. The presented examples are design studies for JT-60 modification.

Journal Articles

Demagnetization of undulator magnets irradiated high energy electrons

Bizen, Teruhiko*; Tanaka, Takashi*; Asano, Yoshihiro; Kim, D. E.*; Bak, J. S.*; Lee, H. S.*; Kitamura, Hideo*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.185 - 189, 2001/07

 Times Cited Count:39 Percentile:92.51(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Effects of defect morphology on the properties of vortex system in Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+delta}$$ irradiated with GeV heavy ions

Kuroda, N.; Ishikawa, Norito; Chimi, Yasuhiro; Iwase, Akihiro; Ikeda, Hiroshi*; Yoshizaki, Ryozo*; Kambara, Tadashi*

Physical Review B, 63(22), p.224502_1 - 224502_5, 2001/06

 Times Cited Count:9 Percentile:48.74(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetization of ceramic Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O after neutron irradiation

Takamura, Saburo; Sekino, Hajime; ; *; Hoshiya, Taiji; *; *

Japanese Journal of Applied Physics, 30(1A), p.L18 - L20, 1991/01

 Times Cited Count:10 Percentile:53.02(Physics, Applied)

no abstracts in English

JAEA Reports

The Verification Experiment of 15-T-Spilit Coil.(Splitar-15)

; ; ;

JAERI-M 85-189, 11 Pages, 1985/11

JAERI-M-85-189.pdf:0.5MB

no abstracts in English

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