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Journal Articles

Status and perspective of the Nb$$_{3}$$Al development

Takeuchi, Takao*; Kikuchi, Akihiro*; Banno, Nobuya*; Kitaguchi, Hitoshi*; Iijima, Yasuo*; Tagawa, Kohei*; Nakagawa, Kazuhiko*; Tsuchiya, Kiyosumi*; Mitsuda, Shiori*; Koizumi, Norikiyo; et al.

Cryogenics, 48(7-8), p.371 - 380, 2008/07

 Times Cited Count:52 Percentile:11.88(Thermodynamics)

Nb$$_{3}$$Al has advantages of better tolerance to strain/stress and a higher critical magnetic field (30 T at 4.2 K) for stoichiometric composition over Nb$$_{3}$$Sn. The rapid-heating, quenching and transformation annealing (RHQT) process enables to form a stoichiometric Nb$$_{3}$$Al with fine grain structures via metastable bcc supersaturated-solid-solution. As a result a large critical current density of Nb$$_{3}$$Al is achieved over the whole range of magnetic fields without trading off the excellent strain tolerance. A long-length of RHQ processing has been established, and a rectangular but Cu stabilized Nb$$_{3}$$Al strand is about be commercially available for NMR uses. Ag or Cu internal stabilization and Cu ion-plating/electroplating techniques have been also developed to enable the stabilized round wire for accelerator and fusion magnets. Successfully energized test coils that were manufactured with a wind-and-react technique have demonstrated that a long piece of Cu stabilized RHQT Nb$$_{3}$$Al wire is really available for practical applications.

Journal Articles

Internally Cu-stabilized RHQT Nb$$_{3}$$Al superconductors with Ta matrix

Takeuchi, Takao*; Tagawa, Kohei*; Noda, Tetsuji*; Banno, Nobuya*; Iijima, Yasuo*; Kikuchi, Akihiro*; Kitaguchi, Hitoshi*; Kosuge, Michio*; Tsuchiya, Kiyosumi*; Koizumi, Norikiyo; et al.

IEEE Transactions on Applied Superconductivity, 16(2), p.1257 - 1260, 2006/06

 Times Cited Count:6 Percentile:61.06(Engineering, Electrical & Electronic)

Next generation nuclear fusion magnets would require a high-current conductor in fields more than 16 T. A CIC conductor of the rapid RHQT processed Nb$$_{3}$$Al may be a promising candidate. Good deformability of intermediately-formed bcc supersaturated-solid solution indeed allowed fabricating such a CIC conductor, which would be subsequently transformation annealed. Ag has been internally included as a basic constituent of a round strand so far, because Ag is almost non-reactive with Nb matrix during the RHQ. However, both of Ag and Nb are not suitable nuclei from the viewpoint of radioactivity when irradiated with neutrons. Recently, we have succeeded in replacing the Nb matrix with Ta that has the advantage of shorter half-life of radioactivity. In the present study, an attempt has been made to replace the Ag internal stabilizer with Cu, in the aim of further reducing radioactivity, based on anticipation that Ta would be less reactive with Cu than Nb did.

Journal Articles

Minor actinide neutron capture cross-section measurements with a 4$$pi$$ Ge spectrometer

Koizumi, Mitsuo; Osa, Akihiko; Toh, Yosuke; Kimura, Atsushi; Mizumoto, Motoharu; Oshima, Masumi; Igashira, Masayuki*; Osaki, Toshiro*; Harada, Hideo*; Furutaka, Kazuyoshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.767 - 770, 2006/06

 Times Cited Count:6 Percentile:54.42(Instruments & Instrumentation)

In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4$$pi$$ Ge spectrometer. A Time-of-Flight neutron beam line for the experiment has been constructed at the KURRI electron LINAC. The assembling of the 4$$pi$$ Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.

Journal Articles

Crossliking of polymers in heavy ion tracks

Koizumi, Hitoshi*; Taguchi, Mitsumasa; Kojima, Takuji; Ichikawa, Tsuneki*

JAERI-Review 2003-033, TIARA Annual Report 2002, p.143 - 144, 2003/11

no abstracts in English

Journal Articles

Chemical effects of heavy ion beams on organic materials

Koizumi, Hitoshi*; Ichikawa, Tsuneki*; Taguchi, Mitsumasa; Kobayashi, Yasuhiko; Namba, Hideki

Nuclear Instruments and Methods in Physics Research B, 206, p.1124 - 1127, 2003/05

 Times Cited Count:7 Percentile:51.75(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Crosslinking of polydimethylsiloxane in heavy ion tracks

Koizumi, Hitoshi*; Taguchi, Mitsumasa; Kobayashi, Yasuhiko; Ichikawa, Tsuneki*

Nuclear Instruments and Methods in Physics Research B, 179(4), p.530 - 535, 2001/09

 Times Cited Count:6 Percentile:53.94(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Photoionization of Ne$$^{3+}$$ ions in the region of the 1${it s}$ $$rightarrow$$ 2${it p}$ autoionizing resonance

Oura, Masaki*; Yamaoka, Hitoshi*; Kawatsura, Kiyoshi*; Kimata, Junichi*; Hayaishi, T.*; Takahashi, Takehisa*; Koizumi, Tetsuo*; Sekioka, T.*; Terasawa, Michitaka*; Ito, Yo*; et al.

Physical Review A, 63(1), p.014704_1 - 014704_4, 2001/01

 Times Cited Count:15 Percentile:38.53(Optics)

no abstracts in English

Journal Articles

Cross-linking of polymers in heavy ion tracks

Koizumi, Hitoshi*; Ichikawa, Tsuneki*; Taguchi, Mitsumasa

JAERI-Review 99-025, TIARA Annual Report 1998, p.93 - 94, 1999/10

no abstracts in English

Oral presentation

Structure analysis of resin-filler compounds by small-angle neutron scattering

Yamaguchi, Daisuke; Koizumi, Satoshi; Ojima, Hitoshi*; Isoyama, Ryo*; Ishiwatari, Yoshiyuki*; Kodama, Hiroto*; Takeda, Hisanori*; Fukita, Hitoshi*; Takashima, Yoshiyuki*

no journal, , 

Resin-filler composites were investigated by small-angle neutron scattering (SANS). Two types of fillers, talc and TiO$$_{2}$$, were employed and compounded with polypropylene in this study. The dispersion state of the fillers was examined by SANS measurements. In addition, the size distribution of the fillers was separately measured through the laser right scattering and SEM. The calculated scattering function including the polydispersity of fillers whose size distribution reflects the results of laser right scattering and SEM consistently reproduced the experimental SANS scattering profiles.

Oral presentation

Fabrication engineering of NV centers of controlling the dipole-dipole interactions

Onoda, Shinobu; Yamamoto, Takashi; Abe, Hiroshi; Hanaya, Hiroaki; Oshima, Takeshi; Taniguchi, Takashi*; Teraji, Tokuyuki*; Watanabe, Kenji*; Koizumi, Satoshi*; Kanda, Hisao*; et al.

no journal, , 

no abstracts in English

Oral presentation

Basic study on sludge formation behavior under reprocessing process condition, 2; Characteristic evaluation of sludge from simulated waste composed of 28 elements

Aihara, Haruka; Takeuchi, Masayuki; Koizumi, Tsutomu; Murao, Ayako*; Mimura, Hitoshi*

no journal, , 

no abstracts in English

Oral presentation

Color centers in diamond and SiC; From ensemble to single-defect measurements

Isoya, Junichi*; Teraji, Tokuyuki*; Yamamoto, Takashi*; Taniguchi, Takashi*; Watanabe, Kenji*; Koizumi, Satoshi*; Onoda, Shinobu; Abe, Hiroshi; Oshima, Takeshi; Umeda, Takahide*; et al.

no journal, , 

no abstracts in English

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