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Journal Articles

Design and actual performance of J-PARC 3 GeV rapid cycling synchrotron for high-intensity operation

Yamamoto, Kazami; Kinsho, Michikazu; Hayashi, Naoki; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Tani, Norio; Takayanagi, Tomohiro; Kamiya, Junichiro; Shobuda, Yoshihiro; et al.

Journal of Nuclear Science and Technology, 32 Pages, 2022/02

In the Japan Proton Accelerator Research Complex, the purpose of the 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at a repetition rate of 25 Hz at high intensities, the RCS was elaborately designed. After starting the RCS operation, we carefully verified the validity of its design and made certain improvements to establish a reliable operation at higher power as possible. Consequently, we demonstrated beam operation at a high power, namely, 1 MW. We then summarized the design, actual performance, and improvements of the RCS to achieve a 1 MW beam.

Journal Articles

Radiation-induced graft polymerization of styrene into a poly(ether ether ketone) film for preparation of polymer electrolyte membranes

Hasegawa, Shin; Sato, Ken*; Narita, Tadashi*; Suzuki, Yasuyuki; Takahashi, Shuichi; Morishita, Norio; Maekawa, Yasunari

Journal of Membrane Science, 345(1-2), p.74 - 80, 2009/12

 Times Cited Count:28 Percentile:69.47(Engineering, Chemical)

Radiation-induced graft polymerization of styrene into poly(ether ether ketone) (PEEK) with 32% crystallinity was investigated with DSC, TGA, XRD, and ESR. Endothermic heats of melting of the original and styrene-grafted PEEK (grafted PEEK) films were similar, indicating the crystallinity was almost completely maintained up to a grafting degree of 51%. Lower glass transition temperature of the grafted PEEK film in the DSC, and the absence of an extra halo originating from amorphous polystyrene grafts in the XRD strongly indicate the grafting of styrene to crystalline PEEK films proceeded in the amorphous region of PEEK. This is probably because polystyrene grafts have hydrocarbon structures similar to a base PEEK polymer, resulting in compatibility to the amorphous phase of the PEEK films. The grafted PEEK films can be converted to PEEK-based electrolyte membranes by subsequent sulfonation, and had conductivity of more than 0.01 S/cm and exhibited higher water content above 100%.

Journal Articles

Design of neutron beamline for fundamental physics at J-PARC BL05

Mishima, Kenji*; Ino, Takashi*; Sakai, Kenji; Shinohara, Takenao; Hirota, Katsuya*; Ikeda, Kazuaki*; Sato, Hiromi*; Otake, Yoshie*; Omori, Hitoshi*; Muto, Suguru*; et al.

Nuclear Instruments and Methods in Physics Research A, 600, p.342 - 345, 2009/02

 Times Cited Count:24 Percentile:85.38(Instruments & Instrumentation)

A new beamline for a fundamental physics experiment is under construction at BL05 port in the Materials and Life Science Facility (MLF) at Japan Proton Accelerator Research Complex (J-PARC), this beamline is designed using novel techniques of neutron optics and it is termed "Neutron Optics and Physics". The beam from the moderator is deflected by multi-channel supermirrors and split into three branches for individual experiments. In this study, we have optimized the design of the beam optics and shields using the Monte Carlo simulation package PHITS. The neutron fluxes of beams are expected to be $$9.2 times 10^5/$$cm$$^2/mu$$str$$/$$s$$/$$MW, $$1.2 times 10^9/$$cm$$^2/$$s$$/$$MW, $$4.0 times 10^8/$$cm$$^2/$$s$$/$$MW, with polarization of 99.8%.

Journal Articles

Interatomic Coulombic decay following the Auger decay; Experimental evidence in rare-gas dimers

Ueda, Kiyoshi*; Fukuzawa, Hironobu*; Liu, X.*; Sakai, Katsunori*; Pr$"u$mper, G.*; Morishita, Yuichiro*; Saito, Norio*; Suzuki, Isao*; Nagaya, Kiyonobu*; Iwayama, Hiroshi*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 166-167, p.3 - 10, 2008/11

 Times Cited Count:22 Percentile:73.84(Spectroscopy)

Interatomic Coulombic decay (ICD) in Ar$$_2$$, ArKr and Kr$$_2$$ following Ar 2p or Kr 3d Auger decay has been investigated by means of momentum-resolved electron-ion-ion-coincidence spectroscopy. This sequential decay leads to Coulombic dissociation into dication and monocation. Simultaneously determining the kinetic energy of the ICD electron and the kinetic energy release between the two atomic ions, we could unambiguously identify the ICD channels. We find that, in general, spin conserved ICD, in which the singlet (triplet) dicationic state produced via the atomic Auger decay preferentially decays to the singlet (triplet) state, transferring the energy to the other atom, is faster than the spin-flip ICD, in which the Auger final singlet (triplet) dicationic state decays to the triplet (singlet) state.

Journal Articles

Design of a dipole magnet for the 3-GeV proton synchrotron of the JAERI/KEK joint project

Tani, Norio; Kanazawa, Kenichiro; Shimada, Taihei; Suzuki, Hiromitsu; Watanabe, Yasuhiro; Adachi, Toshikazu*; Someya, Hirohiko*

Proceedings of 8th European Particle Accelerator Conference (EPAC 2002), p.2376 - 2378, 2002/00

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400 MeV to 3 GeV at a repetition rate of 25 Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a large leakage field at an end part than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components: e.g. a coil, magnet end plates and etc. We intend to use a stranded conductor as a coil conductor so that the eddy current induced in the coil can be reduced. On the other hand, the eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of the large leakage field and the eddy current to the beam motion around the magnet end part. We have constructed a prototype dipole magnet and field measurement system for this purpose. This paper reports the results of the design and the preliminary test about this magnet.

JAEA Reports

Absolute measurement of photon-flux using a multi-electrode ion chamber

Sano, Mutsumi*; Yoshigoe, Akitaka; Teraoka, Yuden; Saito, Norio*; Suzuki, Isao*

JAERI-Tech 2000-081, 21 Pages, 2001/02

JAERI-Tech-2000-081.pdf:0.79MB

no abstracts in English

Journal Articles

Resonant magnet power supply system for the 3GeV synchroton of the JAERI-KEK Joint Project

Zhang, F.; Tani, Norio; Shimada, Taihei; Suzuki, Hiromitsu; Yokomizo, Hideaki

Proceedings of 6th Symposium on Power Supply Technology for Accelerators, p.149 - 155, 2000/11

no abstracts in English

Journal Articles

Formation of a single-bunch beam in the booster synchrotron at SPring-8

Suzuki, Hiromitsu; Aoki, Tsuyoshi*; Ego, Hiroyasu*; Hara, Masahiro*; Hosoya, Naoyasu*; Kawashima, Yoshitaka*; Ohashi, Yuji*; Oshima, Takashi*; Tani, Norio; Yabashi, Makina*; et al.

Nuclear Instruments and Methods in Physics Research A, 444(3), p.515 - 533, 2000/04

 Times Cited Count:6 Percentile:41.24(Instruments & Instrumentation)

no abstracts in English

Journal Articles

New mechanical alloying mothod by axial rolling

Akino, Norio; Suzuki, Tomio

Nihon Kikai Gakkai 2000-Nendo Nenji Taikai Koen Rombunshu, Vol.1, p.557 - 558, 2000/00

no abstracts in English

Journal Articles

The Difference in H-mode confinement between co- and co+counter-neutral beam heating in the JFT-2M tokamak

Miura, Yukitoshi; *; Suzuki, Norio; *

Plasma Physics and Controlled Fusion, 40(5), p.799 - 803, 1998/05

 Times Cited Count:9 Percentile:33.14(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Evaluation of magnetic field due to ferromagnetic vacuum vessel in tokamak

*; Abe, Mitsushi*; Tadokoro, Takahiro*; Miura, Yukitoshi; Suzuki, Norio; Sato, Masayasu; Sengoku, Seio

Purazuma, Kaku Yugo Gakkai-Shi, 74(3), p.274 - 283, 1998/03

no abstracts in English

JAEA Reports

Development of magnetic leakage shield of septum magnet for SPring-8 synchrotron

Abe, Hiroshi; ; *; *; *; *; Kaneta, Takayoshi*; *; Suzuki, Hiromitsu; Tani, Norio; et al.

JAERI-Research 97-068, 51 Pages, 1997/10

JAERI-Research-97-068.pdf:1.78MB

no abstracts in English

Journal Articles

Divertor biasing effects to reduce L/H power threshold in the JFT-2M tokamak

Miura, Yukitoshi; *; *; Hoshino, Katsumichi; *; *; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; Maeda, M.*; et al.

Fusion Energy 1996, p.167 - 175, 1997/05

no abstracts in English

Journal Articles

Investigation of causality in the H-L transition on the JFT-2M tokamak

*; *; *; *; *; *; *; Oikawa, Toshihiro; *; *; et al.

Fusion Energy 1996, p.885 - 890, 1997/05

no abstracts in English

Journal Articles

Measurement of density fluctuations by JFT-2M reflectometer

*; Hoshino, Katsumichi; *; *; *; Miura, Yukitoshi; Suzuki, Norio; *; *; *; et al.

Fusion Engineering and Design, 34-35, p.433 - 436, 1997/00

 Times Cited Count:4 Percentile:38.2(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Ion heat pulse after a sawtooth crash in the JAERI Fusion Torus-2M tokamak

Miura, Yukitoshi; Okano, Fuminori; Suzuki, Norio; Mori, Masahiro; Hoshino, Katsumichi; Takizuka, Tomonori; JFT-2M Group; Ito, Kimitaka*; Ito, Sanae*

Physics of Plasmas, 3(10), p.3696 - 3700, 1996/10

 Times Cited Count:16 Percentile:51.17(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Rapid change of ion energy distribution and floating potential at L/H transition in the JFT-2M tokamak

Miura, Yukitoshi; Nagashima, Keisuke; Ito, Kimitaka; Ito, Sanae*; Okano, Fuminori; Suzuki, Norio; Mori, Masahiro; Hoshino, Katsumichi; Maeda, Hikosuke; Takizuka, Tomonori; et al.

Plasma Physics and Controlled Fusion, 36(7A), p.A81 - A86, 1994/07

 Times Cited Count:5 Percentile:24.87(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Ion heat pulse after sawtooth crash in the JFT-2M tokamak

Miura, Yukitoshi; Okano, Fuminori; Suzuki, Norio; Mori, Masahiro; Hoshino, Katsumichi; Maeda, Hikosuke; Takizuka, Tomonori; JFT-2M Group; Ito, Kimitaka; Ito, Sanae*

NIFS-240, 14 Pages, 1993/08

no abstracts in English

Journal Articles

ITER; Analysis of the H-mode confinement and threshold databases

Kardaun, O.*; Ryter, F.*; Stroth, U.*; Kus, A.*; Deboo, J. C.*; Schissel, D. P.*; Bramson, G.*; Carlstrom, T. N.*; Thomsen, K.*; Campbell, D. J.*; et al.

Plasma Physics and Controlled Nuclear Fusion Research 1992, Vol.3, p.251 - 270, 1993/00

no abstracts in English

Journal Articles

Rapid change of the neutral hydrogen energy distribution at the L/H transition in the JFT-2M tokamak

Miura, Yukitoshi; Okano, Fuminori; Suzuki, Norio; Mori, Masahiro; Hoshino, Katsumichi; Maeda, Hikosuke; Takizuka, Tomonori; JFT-2M Group; Ito, Sanae*; Ito, Kimitaka

Physical Review Letters, 69(15), p.2216 - 2219, 1992/10

 Times Cited Count:28 Percentile:79.12(Physics, Multidisciplinary)

no abstracts in English

62 (Records 1-20 displayed on this page)