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Journal Articles

Quantum proton entanglement on a nanocrystalline silicon surface

Matsumoto, Takahiro*; Sugimoto, Hidehiko*; Ohara, Takashi; Tokumitsu, Akio*; Tomita, Makoto*; Ikeda, Susumu*

Physical Review B, 103(24), p.245401_1 - 245401_9, 2021/06

 Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)

Journal Articles

Effect of copper addition on precipitation behavior near grain boundary in Al-Zn-Mg alloy

Matsuda, Kenji*; Yasumoto, Toru*; Bendo, A.*; Tsuchiya, Taiki*; Lee, S.*; Nishimura, Katsuhiko*; Nunomura, Norio*; Marioara, C. D.*; Lervik, A.*; Holmestad, R.*; et al.

Materials Transactions, 60(8), p.1688 - 1696, 2019/08

 Times Cited Count:13 Percentile:63.77(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Quantum twin spectra in nanocrystalline silicon

Matsumoto, Takahiro*; Ohara, Takashi; Sugimoto, Hidehiko*; Bennington, S. M.*; Ikeda, Susumu*

Physical Review Materials (Internet), 1(5), p.051601_1 - 051601_6, 2017/10

 Times Cited Count:2 Percentile:7.84(Materials Science, Multidisciplinary)

Journal Articles

Identified charged hadron production in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06

 Times Cited Count:176 Percentile:99.41(Physics, Nuclear)

Transverse momentum distributions and yields for $$pi^{pm}, K^{pm}, p$$, and $$bar{p}$$ in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different $$sqrt{s}$$ collisions. We also present the scaling properties such as $$m_T$$ and $$x_T$$ scaling and discuss the mechanism of the particle production in $$p + p$$ collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

 Times Cited Count:7 Percentile:49.81(Physics, Nuclear)

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled $$p+p$$ collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to $$p+p$$ collisions.

Journal Articles

Measurement of neutral mesons in $$p$$ + $$p$$ collisions at $$sqrt{s}$$ = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

 Times Cited Count:169 Percentile:98.47(Astronomy & Astrophysics)

The PHENIX experiment at RHIC has measured the invariant differential cross section for production of $$K^0_s$$, $$omega$$, $$eta'$$ and $$phi$$ mesons in $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, $$n$$ and $$T$$, determining the high $$p_T$$ and characterizing the low $$p_T$$ regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

JAEA Reports

Modification of the drift ducts reionization loss estimation for JT-60U NBI

Kawai, Mikito; Akino, Noboru; Ikeda, Yoshitaka; Ebisawa, Noboru; Honda, Atsushi; Kazawa, Minoru; Kikuchi, Katsumi; Mogaki, Kazuhiko; Noto, Katsuya; Oshima, Katsumi; et al.

JAEA-Technology 2008-069, 32 Pages, 2008/10

JAEA-Technology-2008-069.pdf:6.75MB

The neutral beam injection system for JT-60U consists of positive-ion based type(P-NBI) and negative-ion based type(N-NBI). The reionization losses of neutral beams in the drift ducts of both P-NBI and N-NBI are estimated using the data of ambient pressure and gas flow rate into the beamlines. This system was not enough to obtain detail injection power for a long pulse operation. Modifications of the system to obtain reionization loss for a long pulse operation have been conducted. The new system has a capability to measure the pressures of drift duct during operation. The system can calculate the reionization loss automatically during the pulse from the measured pressure. More acurate injection power can be obtained by this new system.

JAEA Reports

Prototype development of P-NBI data acquisition system for the JT-60SA

Shinozaki, Shinichi; Honda, Atsushi; Oshima, Katsumi; Shimizu, Tatsuo; Numazawa, Susumu*; Ikeda, Yoshitaka

JAEA-Technology 2008-048, 23 Pages, 2008/07

JAEA-Technology-2008-048.pdf:8.1MB

The modification of the JT-60U to a fully superconducting coil tokamak, JT-60SA, has been programmed as the satellite devise for the ITER and as the national centralized tokamak. The present positive-ion-based NBI system, which has employed the expensive CAMAC and has been operated for 20 years, is required to extend its pulse duration from 30 s to 100 s for JT-60SA. Recently, the frequency of troubles on the data acquisition system has increased due to its age-induced deterioration. To realize the long pulse operation and to maintain the high reliability on JT-60SA, we set to develop a new acquisition system. As a first step, we have designed and constructed a prototype acquisition system, which is combined with instruments highly available on the market, to confirm the basic performance. The result indicates that the new system allows us to construct a highly flexible and user-friendly acquisition system at low cost without highly technical software developing.

Journal Articles

Design of a new P-NBI control system for 100-s injection in JT-60SA

Okano, Fuminori; Shinozaki, Shinichi; Honda, Atsushi; Oshima, Katsumi; Numazawa, Susumu*; Ikeda, Yoshitaka

Fusion Engineering and Design, 83(2-3), p.280 - 282, 2008/04

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Application of PLC to dynamic control system for liquid He cryogenic pumping facility on JT-60U NBI system

Honda, Atsushi; Okano, Fuminori; Oshima, Katsumi; Akino, Noboru; Kikuchi, Katsumi; Tanai, Yutaka; Takenouchi, Tadashi; Numazawa, Susumu*; Ikeda, Yoshitaka

Fusion Engineering and Design, 83(2-3), p.276 - 279, 2008/04

 Times Cited Count:11 Percentile:59.25(Nuclear Science & Technology)

The control system of the cryogenic facility in the JT-60 NBI system has been renewed by employing the PLC (Programmable Logic Controller) and SCADA (Supervisory Control And Data Acquisition) system. The original control system was constructed about 20 years ago by specifying the DCS (Distributed Control System) computer to deal with 400 feedback loops. Recently, troubles on this control system have increased due to its aged deterioration. To maintain a high reliability of the cryogenic facility, a new control system has been intended with PLC and SCADA system. By optimizing the function blocks and connecting them in the FBD language, the feedback loops in the new control system have been successfully replaced from DCS to PLC without software developer. At present, the new control system has worked well. This is the first application of the marketable PLC to the actual system with feedback loops of $$>$$ 400 produced by the user itself.

Journal Articles

Current status of the control system for J-PARC accelerator complex

Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Shen, G.; Kato, Yuko; Ito, Yuichi; Ikeda, Hiroshi*; Ishiyama, Tatsuya*; Tsuchiya, Hitoshi*; et al.

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.62 - 64, 2007/10

J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1st. The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.

JAEA Reports

Design study of a new P-NBI control system for 100-s injection in JT-60SA

Honda, Atsushi; Okano, Fuminori; Shinozaki, Shinichi; Oshima, Katsumi; Numazawa, Susumu*; Ikeda, Yoshitaka

JAEA-Technology 2007-026, 19 Pages, 2007/03

JAEA-Technology-2007-026.pdf:3.36MB

The modification of the JT-60U to a fully superconducting coil tokamak, JT-60SA (Super Advanced), has been programmed as the satellite devise for the ITER (International Thermonuclear Experimental Reactor) and as the national centralized tokamak. The present positive-ion-based NBI system (P-NBI), which has been operated for 20 years and will be the main heating system on JT-60SA, is required to manage the long pulse injection extended from 30 s to 100 s at the power of 24 MW with 12 units. To realize such a requirement, the original control system handling more than 4000 digital data is to be fully remodeled. Design study of the new control system has been conducted from viewpoint of market availability, system extensibility, cost-effectiveness and independent development in programming. It has been concluded that a distributed control system using PLC (Programmable Logic Controller) could be applied to the large-scale control system for 100-s operations with satisfaction of the evaluation viewpoints.

Journal Articles

Crystal and magnetic structure of Ca$$_{3}$$Ru$$_{2}$$O$$_{7}$$

Yoshida, Yoshiyuki*; Ikeda, Shinichi*; Matsuhata, Hirofumi*; Shirakawa, Naoki*; Lee, C.-H.*; Katano, Susumu

Physical Review B, 72(5), p.054412_1 - 054412_7, 2005/08

 Times Cited Count:116 Percentile:94.79(Materials Science, Multidisciplinary)

The crystal structure of the double-layered Ca$$_{3}$$Ru$$_{2}$$O$$_{7}$$ has been studied by convergent beam electron diffraction and powder neutron diffraction. The temperature dependence of the diffraction pattern reveals that all the lattice constants jump at the first-order metal-nonmetal transition at 48 K without a change of the space group symmetry of Bb21m. In the neutron diffraction experiment, an additional magnetic reflection emerges below the Neel temperature, 56K. A possible model for this antiferromagnetic ordering is proposed, in which model magnetic moments align ferromagnetically within the double layer and antiferromagnetically between the double layers. This model reasonably explains the characteristic field dependence of the magnetoresistance observed at around 6 T.

Journal Articles

Stabilization of beam power for long pulse operation on JT-60U negative-ion based NBI system

Honda, Atsushi; Kawai, Mikito; Okano, Fuminori; Oshima, Katsumi*; Numazawa, Susumu*; Oga, Tokumichi; Ikeda, Yoshitaka

Heisei-16-Nendo Osaka Daigaku Sogo Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2005/03

no abstracts in English

Journal Articles

Status of spallation neutron source program in high intensity proton accelerator project

Oyama, Yukio; Ikeda, Susumu*; Joint Project Team of JAERI and KEK

JAERI-Conf 2001-002, p.19 - 26, 2001/03

no abstracts in English

Journal Articles

Incommensurate charge ordering in mixed valence system LuFe$$_{2}$$O$$_{4}$$

Ikeda, Naoshi*; Yamada, Yasusada*; Nodo, S.*; Inami, Toshiya; Katano, Susumu

Physica B; Condensed Matter, 241-243, p.820 - 822, 1998/00

 Times Cited Count:20 Percentile:73.66(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Charge ordering in low-doping rate A$$_{1-x}$$B$$_{x}$$MnO$$_{3}$$ (A:La,Pr;B:Sr,Ca)

Inami, Toshiya*; Hino, O.*; Nodo, S.*; Kaneo, Rinna*; Ikeda, Naoshi*; Yamada, Yasusada*; Katano, Susumu

Physica B; Condensed Matter, 241-243, p.433 - 435, 1998/00

 Times Cited Count:6 Percentile:42.71(Physics, Condensed Matter)

no abstracts in English

JAEA Reports

2nd power-up test for JRR-2

Kambara, Toyozo; Uno, Hidero; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Takayanagi, Hiroshi; Fujimura, Tsutomu; Morita, Morito; Ichihara, Masahiro; et al.

JAERI 1045, 11 Pages, 1963/03

JAERI-1045.pdf:0.72MB

no abstracts in English

Oral presentation

Preliminary design of the control system of the positive-ion based NBI system in JT-60SA

Okano, Fuminori; Honda, Atsushi; Oshima, Katsumi; Shinozaki, Shinichi; Numazawa, Susumu*; Ikeda, Yoshitaka

no journal, , 

no abstracts in English

Oral presentation

Prototype development of the data acquisition system for the NBI heating system

Honda, Atsushi; Shinozaki, Shinichi; Oshima, Katsumi; Shimizu, Tatsuo; Numazawa, Susumu*; Ikeda, Yoshitaka

no journal, , 

no abstracts in English

Oral presentation

Cooperation of texture measurement study of steel materials between large-scale neutron facilities and RIKEN compact neutron source

Xu, P. G.; Takamura, Masato*; Ikeda, Yoshimasa*; Kakuta, Ryunosuke*; Takahashi, Susumu*; Hakoyama, Tomoyuki*; Iwamoto, Chihiro*; Otake, Yoshie*; Suzuki, Hiroshi

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)