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Katano, Susumu; Minakawa, Nobuaki*; Hasebe, Tsugunori*; Sakuraba, Junji*
Physica B; Condensed Matter, 385-386(Part 2), p.1300 - 1302, 2006/11
Times Cited Count：9 Percentile：40.08(Physics, Condensed Matter)A new high-field superconducting magnet of the cryogen-free type has been developed. The superconducting coil of this system is directly cooled down by three 4 K-GM cryocoolers. The magnet consists of a split-pair of (Nb,Ti)
Sn inner coils and NbTi outer ones; and its outer diameter is 545 mm and the height is 352 mm. The gap for the beam path is 18 mm at the horizontal level. These upper and lower coils are supported by five Al alloy rings and an Al alloy plate of 90
in angle. The total thickness of the Al alloys in the beam-path is 65.2 mm, and the transmission of about 60% is obtained for neutrons with 13.7 meV. The bore at room temperature is 51 mm in diameter. In this bore a sample cooling-system of a 4K-cryocooler or a cryogen-free dilution refrigerator is inserted. The size of the standard sample cell is 35 mm in diameter. In this sample space nonmagnetic high pressure cells up to 4 GPa can be set in. With these apparatus experiments under multiple extreme conditions are achieved. Some difficulties encountered during this development are briefly described. Now the maximum field in ordinary use of 13.5 T is stably obtained.
Suzuki, Hiroshi; Holden, T. M.*; Moriai, Atsushi; Minakawa, Nobuaki*; Morii, Yukio
Zairyo, 54(7), p.685 - 691, 2005/07
no abstracts in English
Suzuki, Hiroshi; Moriai, Atsushi; Minakawa, Nobuaki*; Morii, Yukio
Zairyo, 54(3), p.339 - 345, 2005/03
In a conventional method of a neutron stress measurement, it is required to know the stress-free lattice constant accurately. A new stress measurement method, which does not need the lattice constant of the strain-free material, was applied to evaluate the residual stress distributions in welded sample. The lattice constant distribution which was measured by using our proposed method showed an increase as close to the weld zone, and the absolute value of the lattice constant almost agreed with the lattice constant which was measured using coupons cut from welded sample. Therefore, it is possible to predict the lattice constant by using our proposed method. The residual stress distributions were evaluated by using conventional method and our proposed method. As a result, the residual stress distributions decided by our proposed method almost agreed with those measured by conventional method. This proposed method can be applied to determination of the residual stress states in the samples with the complex residual stress states.
Suzuki, Hiroshi; Minakawa, Nobuaki*; Moriai, Atsushi; Hataya, Mitsuhiko*; Morii, Yukio
Materials Science Forum, 490-491, p.245 - 250, 2005/00
In the conventional stress measurement method using neutron diffraction, it is required to measure the lattice strains of the same diffraction family in all three orthogonal directions. However, it is possibly difficult to measure the lattice strains of the same diffraction family in all three directions on the textured material, and also the lattice strains in three directions may not be measured in some reasons such as the size and the shape of the sample, etc. Moreover, in conventional method, it is required to know the accurate stress free lattice spacing d
, so that the stress measurement accuracy depends on the accuracy of d of powder or annealed samples. In this study, we proposed new stress measurement method which can determine the residual stress states by measuring the lattice strains in two or three orthogonal directions even if the measured diffraction families were different in all three directions. Furthermore, stress measurement method which can determine the internal residual stresses without using measured d was also proposed.
Baba, Shinichi; Ishihara, Masahiro; Minakawa, Nobuaki; Suzuki, Junichi
Proceedings of International Conference on Advanced Technology in Experimental Mechanics 2003 (ATEM '03) (CD-ROM), 4 Pages, 2003/09
The aim of the present paper is to clarify the residual stress occuring in the c/c composite to improve the manufacturing process. The residual stress was measured by a neutron diffraction method using the RESA in the JRR-3M of JAERI in this study. As a results of the residual stress measurment, it was found that the residual stress of the ring type c/c composite is the comporessive stress, and the macroscopic residual strain/stress is absorbed mainly microstructural change such as pore shape change.
Katano, Susumu; Minakawa, Nobuaki; Metoki, Naoto; Osakabe, Toyotaka; Suzuki, Junichi; Koike, Yoshihiro; Ishii, Yoshinobu
Applied Physics A, 74(Suppl.1), p.S270 - S272, 2002/12
Times Cited Count：14 Percentile：49.47(Materials Science, Multidisciplinary)no abstracts in English
Minakawa, Nobuaki; Moriai, Atsushi; Morii, Yukio
Nihon Zairyo Gakkai Dai-38-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.202 - 205, 2002/09
no abstracts in English
Minakawa, Nobuaki; Morii, Yukio; Moriai, Atsushi; Otomo, Akitoshi; Kikuchi, Kenji
Journal of the Physical Society of Japan, Vol.70, Supplement A, p.517 - 519, 2001/05
no abstracts in English
Moriai, Atsushi; Onodera, Akifumi*; Amita, Fujitsugu*; Otomo, Akitoshi; Minakawa, Nobuaki
Journal of the Physical Society of Japan, Vol.70, Supplement A, p.531 - 533, 2001/05
no abstracts in English
Tsuchiya, Yoshinori; Kikuchi, Kenji; Minakawa, Nobuaki; Morii, Yukio; Kato, Takashi; Nakajima, Hideo; Tsuji, Hiroshi
Journal of the Physical Society of Japan, Vol.70, Supplement A, p.520 - 522, 2001/05
no abstracts in English
Minakawa, Nobuaki; Morii, Yukio; Moriai, Atsushi; Kikuchi, Kenji
Material Evaluation by X-Ray and Neutron Diffraction, p.H_19_1 - H_19_5, 2001/05
no abstracts in English
Okido, Shinobu*; Hayashi, Makoto*; Morii, Yukio; Minakawa, Nobuaki
Materials Science Research International, Special Technical Publication, 1, p.435 - 438, 2001/05
no abstracts in English
Hayashi, Makoto*; Okido, Shinobu*; Morii, Yukio; Minakawa, Nobuaki
Materials Science Research International, Special Technical Publication, 1, p.418 - 423, 2001/05
no abstracts in English
Akiniwa, Yoshiaki*; Tanaka, Keisuke*; Minakawa, Nobuaki; Morii, Yukio
Materials Science Research International, Special Technical Publication, 1, p.427 - 430, 2001/05
no abstracts in English
Inoue, Kazuko*; Nakamura, Hiroshi*; Horikawa, Takeshi*; Kawashima, Hisakazu*; Tsujikami, Tetsuya*; Minakawa, Nobuaki
Nihon Zairyo Gakkai Dai-50-Ki Gakujutsu Koenkai Koen Rombunshu, p.415 - 416, 2001/05
no abstracts in English
Minakawa, Nobuaki; Moriai, Atsushi; Morii, Yukio; Saito, Toru*
Nihon Zairyo Gakkai Dai-37-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.220 - 222, 2001/00
no abstracts in English
Moriai, Atsushi; Kogawa, Hiroyuki; Yamamoto, Kazuyoshi; Kaminaga, Masanori; Minakawa, Nobuaki; Horiguchi, Yoji
Nihon Zairyo Gakkai Dai-37-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.35 - 37, 2001/00
no abstracts in English
Sasaki, Toshihiko*; Minakawa, Nobuaki; Morii, Yukio; Niimura, Nobuo; Hirose, Yukio*
Nihon Zairyo Gakkai Dai-36-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.259 - 262, 2000/09
no abstracts in English
Takago, S.*; Sasaki, Toshihiko*; Minakawa, Nobuaki; Morii, Yukio; Hirose, Yukio*
Nihon Zairyo Gakkai Dai-36-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.266 - 271, 2000/09
no abstracts in English
Minakawa, Nobuaki; Moriai, Atsushi; Otomo, Akitoshi; Rifai*
Nihon Zairyo Gakkai Dai-36-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.272 - 275, 2000/09
no abstracts in English
