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Journal Articles

Beam power and residual dose history of J-PARC RCS

Yamamoto, Kazami; Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Yoshimoto, Masahiro; Nakane, Yoshihiro; et al.

Progress in Nuclear Science and Technology (Internet), 4, p.238 - 242, 2014/04

A 3 GeV rapid cycling synchrotron (RCS) at J-PARC was commissioned in October 2007. Afterwards, the beam intensity was increased through a beam study, and the RCS has continuously provided a proton beam $$>$$ 100 kW to the neutron target since October 2009. With renewed efforts brought about by beam commissioning, we have reduced losses in the RCS and achieved low-loss operation. We present the history of the operational beam power and the residual dose distributions after operation.

Journal Articles

Development of the trigger management device for the waveform record device

Sakaki, Hironao; Ito, Yuichi*; Kato, Yuko*; Miyamoto, Koji*; Kawamura, Naoki*; Nakamura, Takeshi*

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.549 - 551, 2004/08

We developed the pulse wave form recorder with the flight recorder function, last year. The recorders are scheduled to be used for the beam status monitor system in J-PARC. If the pulse number between each recorder in the system has not synchronized, each waveform data can't match in the analysis software. As a result, we'll lose the time for the analysis. In this report, the design of the device that conform to all pulse number of each recorder is described.

JAEA Reports

Recent status of research activities for development of CTBT-related technologies in JAERI

Hirota, Naoki*; Hokida, Takanori; Inoue, Yoji; Kumata, Masahiro; Kurosawa, Yoshiaki; Miyamoto, Yutaka; Nakahara, Yoshinori; Oda, Tetsuzo; Shinohara, Nobuo; Uchikoshi, Takako*; et al.

JAERI-Review 2003-021, 68 Pages, 2003/08

JAERI-Review-2003-021.pdf:9.73MB

This report describes research activities of the R & D Group for Non-Proliferation Technology related to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) verification regime. The main subjects of this report are (1) an overview of the CTBT verification regime, (2) preparation of the National Data Center for radionuclide data, (3) construction and operation of the radionuclide monitoring stations at Takasaki and Okinawa and the certified rarionuclide laboratory at Tokai in Japan. We have participated in an intercomparison test internationally organized for the certified laboratories and the test results are given here. Scientific application of the CTBT-related technologies to environmental researches is also depicted.

Journal Articles

Development of the wave-fmonitoring device with pre-recording function

Sakaki, Hironao; Kato, Yuko*; Kawamura, Naoki*; Miyamoto, Koji*; Nakamura, Takeshi*

Proceedings of 28th Linear Accelerator Meeting in Japan, p.96 - 98, 2003/08

The huge proton accelerator facilities (J-PARC) have constructed in the Japan Atomic Energy Research Institute Tokai laboratory. Here, even for only one beam operation error, there is a possibility with making to the radiation and destruction to the accelerator equipments.Then, all beams are observed in Linac, and the system to which the cause of the trouble occurrence is investigated at once is aspired after. This time, it was possible to become a strong tool in not only J-PARC but also large-scale accelerator facilities from based on such a background, and the watching device which had a new function was developed.

Journal Articles

Radionuclide monitoring stations in CTBT verification regime

Kumata, Masahiro; Oda, Tetsuzo; Miyamoto, Yutaka; Uchikoshi, Takako*; Nakahara, Yoshinori; Yamamoto, Yoichi; Hokida, Takanori; Hirota, Naoki*; Inoue, Yoji; Shinohara, Nobuo

Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.39 - 44, 2002/12

The International Monitoring System (IMS) will be established across the world to verify compliance with the Comprehensive Test Ban Treaty (CTBT). The IMS will be capable of detecting and identifying nuclear explosions of detonated within the atmosphere, underwater and underground. 321 monitoring stations will be set around the world as a monitoring network of the IMS. The four technologies of seismology, hydroacoustic, infrasound, and radionuclide will be used for monitoring purposes. In order to build the radionuclide monitoring network, 80 radionuclide stations were chosen. Particles in the atmosphere are collected on a filter at each station to measure radioactivity by a HP-Ge detector. Further, 40 out of these 80 stations will be equipped with an automatic radioactive noble gas sampler/analyzer. The JAERI is establishing infrastructure to host radionuclide air monitoring equipment for two raionuclide stations in Japan. This paper presents the current status of the establishment and promising performance of the stations in Japan.

JAEA Reports

Experimental study on the influence of radiation on high-voltage insulation gases

Fujiwara, Yukio; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Ohara, Yoshihiro; Okumura, Yoshikazu; Watanabe, Kazuhiro

JAERI-Research 99-071, p.33 - 0, 1999/12

JAERI-Research-99-071.pdf:1.18MB

no abstracts in English

JAEA Reports

Development of a bucket type ion source for FNS

Miyamoto, Naoki*; Seki, Masakazu; Kinsho, Michikazu; Oguri, Hidetomo; Okumura, Yoshikazu

JAERI-Tech 99-010, 27 Pages, 1999/02

JAERI-Tech-99-010.pdf:0.8MB

no abstracts in English

Journal Articles

Development of a multiaperture, multistage electrostatic accelerator for hydrogen negative ion beams

Watanabe, Kazuhiro; Fujiwara, Yukio; Hanada, Masaya; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Ohara, Yoshihiro; Okumura, Yoshikazu

Review of Scientific Instruments, 69(2), p.986 - 988, 1998/02

 Times Cited Count:2 Percentile:29.71(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Temperature control of plasma grid for continuous operation in cesium-seeded volume negative ion source

Fujiwara, Yukio; Miyamoto, Naoki*; Okumura, Yoshikazu

Review of Scientific Instruments, 69(2), p.1173 - 1175, 1998/02

 Times Cited Count:7 Percentile:53.02(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Steady-state operation of an ampere-class hydrogen negative ion source

Okumura, Yoshikazu; Hanada, Masaya; Miyamoto, Naoki*; Miyamoto, Kenji; Fujiwara, Yukio; Watanabe, Kazuhiro

Dai-9-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS1998), p.101 - 104, 1998/00

no abstracts in English

Journal Articles

Development of a 1MeV H$$^{-}$$ beam accelerator for neutral beam injector

Watanabe, Kazuhiro; Fujiwara, Yukio; Hanada, Masaya; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Okumura, Yoshikazu; Sato, Kazuyoshi

Fusion Technology 1998, 1, p.493 - 496, 1998/00

no abstracts in English

Journal Articles

Radiation induced conductivity and voltage holding characterisics of insulation gas for the ITER-NBI

Fujiwara, Yukio; Hanada, Masaya; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Ohara, Yoshihiro; Okumura, Yoshikazu; Watanabe, Kazuhiro

Proc. of Joint Meeting of 8th Int. Symp. on the Production and Neutralization of Negative Ions & Beams, p.205 - 215, 1997/00

no abstracts in English

Journal Articles

Multi-stage,multi-aperture electrostatic accelerator for H$$^{-}$$ ions

Watanabe, Kazuhiro; Fujiwara, Yukio; Hanada, Masaya; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Ohara, Yoshihiro; Okumura, Yoshikazu

Proc. of Joint Meeting of 8th Int. Symp. on the Production and Neutralization of Negative Ions & Beams, p.179 - 186, 1997/00

no abstracts in English

Journal Articles

Recent progress of high-power negative ion beam development for fusion plasma heating

Watanabe, Kazuhiro; ; Aoyagi, Tetsuo; ; Fujiwara, Yukio; Honda, Atsushi; Inoue, Takashi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; et al.

Radiation Physics and Chemistry, 49(6), p.631 - 639, 1997/00

 Times Cited Count:3 Percentile:30.38(Chemistry, Physical)

no abstracts in English

Journal Articles

Development of a high brightness negative hydrogen ion source

; Okumura, Yoshikazu; Miyamoto, Naoki*; Kusano, Joichi; Mizumoto, Motoharu

Review of Scientific Instruments, 67(3), p.1051 - 1053, 1996/03

 Times Cited Count:1 Percentile:23.5(Instruments & Instrumentation)

no abstracts in English

Journal Articles

High power negative ion sources for fusion at the Japan Atomic Energy Research Institute

Okumura, Yoshikazu; Fujiwara, Yukio; Inoue, Takashi; Miyamoto, Kenji; Miyamoto, Naoki*; Nagase, Akihito*; Ohara, Yoshihiro; Watanabe, Kazuhiro

Review of Scientific Instruments, 67(3), p.1092 - 1097, 1996/03

 Times Cited Count:31 Percentile:87.44(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of a 500 keV, 22A D$$^{-}$$ ion source for the neutral beam injector for JT-60U

Okumura, Yoshikazu; Fujiwara, Yukio; Honda, Atsushi; Inoue, Takashi; Kuriyama, Masaaki; Miyamoto, Kenji; Miyamoto, Naoki*; Mogaki, Kazuhiko; Nagase, Akihito*; Ohara, Yoshihiro; et al.

Review of Scientific Instruments, 67(3), p.1018 - 1020, 1996/03

 Times Cited Count:29 Percentile:86.31(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of negative ion beam accelerators for high power neutral beam systems

Watanabe, Kazuhiro; ; Fujiwara, Yukio; Honda, Atsushi; Inoue, Takashi; Kazawa, Minoru; Kuriyama, Masaaki; Miyamoto, Kenji; Miyamoto, Naoki*; Mogaki, Kazuhiko; et al.

16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 1, p.642 - 645, 1996/00

no abstracts in English

Journal Articles

Experimental results on ITER-NBI concept source

Miyamoto, Naoki*; ; Okumura, Yoshikazu; Inoue, Takashi; Fujiwara, Yukio; Miyamoto, Kenji; Nagase, Akihito*; Ohara, Yoshihiro; Watanabe, Kazuhiro

AIP Conference Proceedings 380, p.300 - 308, 1996/00

no abstracts in English

Journal Articles

Design and R&D of high power negative ion source/accelerator for ITER NBI

Inoue, Takashi; Okumura, Yoshikazu; Fujiwara, Yukio; Miyamoto, Kenji; Ohara, Yoshihiro; Miyamoto, Naoki*; Watanabe, Kazuhiro; B.Heinemann*; *

Fusion Technology 1996, 1, p.701 - 704, 1996/00

no abstracts in English

22 (Records 1-20 displayed on this page)