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He neutron spin filter at J-PARCOkudaira, Takuya; Oku, Takayuki; Ino, Takashi*; Hayashida, Hirotoshi*; Kira, Hiroshi*; Sakai, Kenji; Hiroi, Kosuke; Takahashi, Shingo*; Aizawa, Kazuya; Endo, Hitoshi*; et al.
Nuclear Instruments and Methods in Physics Research A, 977, p.164301_1 - 164301_8, 2020/10
Times Cited Count：10 Percentile：79.13(Instruments & Instrumentation)
-rays after neutron capture by 
La for a T-violation searchOkudaira, Takuya; Shimizu, Hirohiko*; Kitaguchi, Masaaki*; Hirota, Katsuya*; Haddock, C. C.*; Ito, Ikuya*; Yamamoto, Tomoki*; Endo, Shunsuke*; Ishizaki, Kohei*; Sato, Takumi*; et al.
EPJ Web of Conferences, 219, p.09001_1 - 09001_6, 2019/12
Parity violating effects enhanced by up to 10
times have been observed in several neutron induced compound nuclei. There is a theoretical prediction that time reversal (T) violating effects can also be enhanced in these nuclei implying that T-violation can be searched for by making very sensitive measurements. However, the enhancement factor has not yet been measured in all nuclei. The angular distribution of the (n,) reaction was measured with La by using a germanium detector assembly at J-PARC, and the enhancement factor was obtained. From the result, the measurement time to achieve the most sensitive T-violation search was estimated as 1.4 days, and a 40% polarized La target and a 70% polarized He spin filter whose thickness is 70 atm
cm are needed. Therefore high quality He spin filter is developed in JAEA. The measurement result of the (n,) reaction at J-PARC and the development status of the He spin filter will be presented.
Okudaira, Takuya; Oku, Takayuki; Sakai, Kenji; Ino, Takashi*; Hayashida, Hirotoshi*; Hiroi, Kosuke; Shinohara, Takenao; Kakurai, Kazuhisa*; Aizawa, Kazuya; Shimizu, Hirohiko*; et al.
Proceedings of Science (Internet), 356, p.029_1 - 029_5, 2019/12
The technology development section carries out the development of the neutron polarization device: 
He Spin Filter. It is often used for the fundamental physics region. In order to explain the matter-dominated universe, a time reversal violation is necessary and searches for new physics are conducted in the world. The T-violation search using a polarized neutron beam is planned at J-PARC. A large He spin filter is needed to polarize high energy neutrons for the experiment and is developed in JAEA. Recently, we developed the accurate measurement system to evaluate the polarization of He and a vacuum system to make the He spin filter, and large He spin filters for epi-thermal neutron was made using the system. The current status of the development of the He spin filter will be talked.
Yokoyama, Kenji; Kitada, Takanori*
Journal of Nuclear Science and Technology, 56(1), p.87 - 104, 2019/01
Times Cited Count：4 Percentile：41.24(Nuclear Science & Technology)no abstracts in English
Tsujimura, Norio; Yoshida, Tadayoshi; Yashima, Hiroshi*
JPS Conference Proceedings (Internet), 11, p.050005_1 - 050005_6, 2016/11
Horiguchi, Naoki; Yoshida, Hiroyuki; Nakao, Yasuhiro*; Kaneko, Akiko*; Abe, Yutaka*
Proceedings of 10th Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-10) (USB Flash Drive), 7 Pages, 2016/11
Tamada, Masao
Hoshasen Kagaku (Internet), (100), P. 16, 2015/10
Collection of a rare metal form hot spring water attracted medias and had a public response by reports of numerous newspapers and television programs in my 35 years' research and development of radiation processing technologies and its technology management. Collection experiments of the rare metal were carried out in Kusatsu Onsen, Gunma prefecture, where discharge of hot spring water is the largest in Japan. We were on standby 6 am there when morning live broadcast started from 8 am. The invention of emersion grafting solved the problems in the cost reduction of adsorbent production owing to its high grafting yield and led the way for technology transfer of filter for the removal of metal ions in ppb level from semiconductor cleaning liquid and adsorbent for radio-active cesium.
Umeda, Naotaka; Ikeda, Yoshitaka; Hanada, Masaya; Inoue, Takashi; Kawai, Mikito; Kazawa, Minoru; Komata, Masao; Mogaki, Kazuhiko; Oga, Tokumichi
Review of Scientific Instruments, 77(3), p.03A529_1 - 03A529_3, 2006/03
Times Cited Count：6 Percentile：34.02(Instruments & Instrumentation)no abstracts in English
Sugimoto, Masaki
Kogyo Zairyo, 53(12), p.75 - 79, 2005/12
no abstracts in English
Imanishi, Nobutsugu*; Ito, Akio*; Kanno, Ikuo*; Yoshida, Koji*; Onabe, Hideaki*
JAERI-Tech 2005-007, 45 Pages, 2005/03
JAERI-Tech-2005-007.pdf:6.84MB
no abstracts in English
Sugimoto, Masaki
Hoshasen To Sangyo, (105), p.29 - 34, 2005/03
no abstracts in English
Futakawa, Masatoshi; Wakui, Takashi*; Naoe, Takashi*; Ioka, Ikuo
Jikken Rikigaku, 4(3), p.222 - 227, 2004/09
no abstracts in English
Ida, Masato; Taniguchi, Nobuyuki*
Nihon Ryutai Rikigakkai Nenkai 2004 Koen Rombunshu, p.122 - 123, 2004/08
The numerical stability of the Gaussian filtered Navier-Stokes equations is studied theoretically. Our recent theoretical results showed that for a large filter width, the linear shears in the time-averaged velocity fields numerically destabilize the fluctuation components because a numerically unstable term is derived by the Gaussian filtering operation. In this report we extend that numerical stability analysis based on an exact expansion series for the subgrid-scale stress terms and a numerical stability analysis of arbitrary-order spatial derivatives. The present investigation shows that numerically unstable terms can appear in many situations.
Nishikawa, Hiroyuki*; Souno, T.*; Hattori, M.*; Oki, Y.*; Watanabe, E.*; Oikawa, Masakazu*; Arakawa, Kazuo; Kamiya, Tomihiro
JAERI-Review 2003-033, TIARA Annual Report 2002, p.254 - 256, 2003/11
no abstracts in English
Kobayashi, Shinji*; Sakasai, Akira; Koide, Yoshihiko; Sakamoto, Yoshiteru; Kamada, Yutaka; Hatae, Takaki; Oyama, Naoyuki; Miura, Yukitoshi
Purazuma, Kaku Yugo Gakkai-Shi, 79(10), p.1043 - 1050, 2003/10
no abstracts in English
Morishita, Takatoshi; Iga, Takashi*; Inoue, Takashi; Imai, Tsuyoshi; Kashiwagi, Mieko; Shimizu, Takashi; Taniguchi, Masaki; Hanada, Masaya; Watanabe, Kazuhiro
Dai-1-Kai 21-Seiki Rengo Shimpojiumu; Kagaku Gijutsu To Ningen Rombunshu, p.221 - 224, 2002/11
A high proton ratio (
90%) and a high current density proton beam is demanded in the International Fusion Materials Irradiation Facility (IFMIF). In the development of the beam source for nuclear fusion, it was indicated that the enhancement of the ion confinement using the large ion source is suitable for the increase in the proton ratio. In the beam source for accelerators, a single beamlet is enough to obtain a certain beam current, therefore, a small ion source is suitable from the aspect of efficiency and simplification of the system. To obtain the high proton ratio beam from the small ion source, it is necessary to grasp the production mechanism of proton. Then, the production process of the proton in the small ion source was investigated using rate equations. Obtained results were compared with experimental results. Consequently, although the proton is mainly produced from the molecular positive ions as considered conventionally, the production of the high proton ratio beam is also possible in the small ion source due to the effects of the magnetic filter.
Ishiyama, Shintaro; Muto, Yasushi; Fumizawa, Motoo; Tsukazaki, Kazuo*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 1(2), p.164 - 176, 2002/06
no abstracts in English
Koike, Masato; Sano, Kazuo*; Yoda, Osamu; Harada, Yoshihisa*; Ishino, Masahiko; Moriya, Naoji*; Sasai, Hiroyuki*; Takenaka, Hisataka*; Gullikson, E. M.*; Mrowka, S.*; et al.
Review of Scientific Instruments, 73(3), p.1541 - 1544, 2002/03
Times Cited Count：20 Percentile：68.31(Instruments & Instrumentation)no abstracts in English
Morishita, Takatoshi; Kashiwagi, Mieko; Okumura, Yoshikazu; Watanabe, Kazuhiro; Hanada, Masaya; Inoue, Takashi; Imai, Tsuyoshi
Dai-12-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS 2001) Hobunshu, p.33 - 36, 2001/11
no abstracts in English
Lee, S.; Kondoh, Takashi; Yonemoto, Y.*; Miura, Yukitoshi
Review of Scientific Instruments, 71(12), p.4445 - 4448, 2000/12
Times Cited Count：6 Percentile：44.18(Instruments & Instrumentation)no abstracts in English
