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Journal Articles

Advanced non-destructive analysis technique capable of rapidly determining uranium mass contained in waste drum with high accuracy

Ozu, Akira; Komeda, Masao; Kureta, Masatoshi; Nakatsuka, Yoshiaki; Nakashima, Shinichi

Nippon Genshiryoku Gakkai-Shi, 59(12), p.700 - 704, 2017/12

no abstracts in English

Journal Articles

Present status of the laser charge exchange test using the 3-MeV linac in J-PARC

Takei, Hayanori; Chishiro, Etsuji; Hirano, Koichiro; Kondo, Yasuhiro; Meigo, Shinichiro; Miura, Akihiko; Morishita, Takatoshi; Oguri, Hidetomo; Tsutsumi, Kazuyoshi

Proceedings of 5th International Beam Instrumentation Conference (IBIC 2016) (Internet), p.736 - 739, 2017/03

The Accelerator-driven System (ADS) is one of the candidates for transmuting long-lived nuclides, such as minor actinide (MA), produced by nuclear reactors. For efficient transmutation of the MA, a precise pre-diction of neutronics of ADS is required. In order to obtain the neutronics data for the ADS, the Japan Pro-ton Accelerator Research Complex (J-PARC) has a plan to build the Transmutation Physics Experimental Facility (TEF-P), in which a 400-MeV negative proton (H$$^{-}$$) beam will be delivered from the J-PARC linac. Since the TEF-P requires a stable proton beam with a power of less than 10W, a stable and meticulous beam extraction method is required to extract a small amount of the proton beam from the high power beam using 250kW. To fulfil this requirement, the Laser Charge Exchange (LCE) method has been developed. The LCE strips the electron of the H$$^{-}$$ beam and neutral protons will separate at the bending magnet in the proton beam transport. To demonstrate the charge exchange of the H$$^{-}$$, a preliminary LCE experiment was conducted using a linac with energy of 3MeV in J-PARC. As a result of the experiment, a charge-exchanged H$$^{+}$$ beam with a power of about 5W equivalent was obtained under the J-PARC linac beam condition, and this value almost satisfied the power requirement of the proton beam for the TEF-P.

Journal Articles

Preliminary results of the laser charge exchange test using the 3-MeV linac in J-PARC

Takei, Hayanori; Hirano, Koichiro; Tsutsumi, Kazuyoshi; Chishiro, Etsuji; Miura, Akihiko; Kondo, Yasuhiro; Morishita, Takatoshi; Oguri, Hidetomo; Meigo, Shinichiro

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.987 - 991, 2016/11

Accelerator-driven system (ADS) is one of candidates to transmute long-lived nuclides such as minor actinide (MA) produced at nuclear reactor. For efficient transmutation of the MA, precise prediction of neutronics of ADS is indispensable. In order to obtain the neutronics data for the ADS, J-PARC has a plan to build the Transmutation Physics Experimental Facility (TEF-P). Since the TEF-P requires stable power of the beam and will operate with thermal power less than 500 W and the proton beam power of 10 W so that a stable and meticulous beam extraction method is required to extract small amount of the beam from the high power LINAC beam with 250 kW. To fulfill requirement, Laser charge exchange method (LCE) has been developed for delivery of 400-MeV proton beam with 25Hz to the TEF-P. The LCE strips the electron of H$$^{-}$$ beam and H$$^{0}$$ will separate at the bending magnet at the proton beam transport. The LCE device consists of YAG-laser with high power as 1.6 J/shot and 25 Hz and transport control system with high accuracy of the beam position. For the demonstration of the charge exchange of the H$$^{-}$$, the further LCE tests is conducted using H$$^{-}$$ beam with energy of 3-MeV at RFQ test stand in J-PARC. In this paper, present status of LCE tests is presented.

Journal Articles

Measurement of neutron spectra produced in the forward direction from thick graphite, Al, Fe and Pb targets bombarded by 350 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.789 - 792, 2006/06

 Times Cited Count:6 Percentile:53.06(Instruments & Instrumentation)

Neutron energy spectra produced from thick targets play an important role in validation of calculation codes that are employed in the design of spallation neutron sources and the shielding design of accelerator facilities. However, appropriate experimental data were scarce in the forward direction for the incident energy higher than 100 MeV. In this study, neutron spectra at 0 degree from thick targets bombarded with 350 MeV protons were measured by the time-of-flight technique using an NE213. The targets used were graphite, Al, Fe and Pb and their thicknesses were chosen to be a little thicker than the stopping lengths. The experiment was carried out at the TOF course of the RCNP (Research Center of Nuclear Physics) ring cyclotron, Osaka University. The flight path length between center of the target and of an NE213 were 11.4 m for the measurement of low energy neutrons and 95 m for high energy neutrons. The experimental data are compared with the calculated results by using the Monte Carlo transport codes, such as MCNPX and PHITS codes.

Journal Articles

Focused microbeam formation for heavy ion beam from AVF cyclotron

Yokota, Wataru; Sato, Takahiro; Oikawa, Masakazu*; Sakai, Takuro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Kashiwagi, Hirotsugu; Fukuda, Mitsuhiro

JAEA-Review 2005-001, TIARA Annual Report 2004, p.291 - 292, 2006/01

no abstracts in English

Journal Articles

Experiment and analyses for 14 MeV neutron streaming through a dogleg duct

Yamauchi, Michinori*; Ochiai, Kentaro; Morimoto, Yuichi*; Wada, Masayuki*; Sato, Satoshi; Nishitani, Takeo

Radiation Protection Dosimetry, 116(1-4), p.542 - 546, 2005/12

 Times Cited Count:3 Percentile:72.48(Environmental Sciences)

no abstracts in English

Journal Articles

MeV cluster ions from TIARA 3MV tandem accelerator

Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa

Dai-18-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.47 - 49, 2005/11

no abstracts in English

Journal Articles

Integral benchmark experiments of the Japanese Evaluated Nuclear Data Library (JENDL)-3.3 for the fusion reactor design

Nishitani, Takeo; Ochiai, Kentaro; Maekawa, Fujio; Shibata, Keiichi; Wada, Masayuki*; Murata, Isao*

IAEA-CN-116/FT/P1-22 (CD-ROM), 8 Pages, 2004/11

no abstracts in English

Journal Articles

High-sensitive detection by direct interrogation of 14 MeV Acc neutrons, 1; Uranium-contained metal matrix in a waste dram

Haruyama, Mitsuo; Takase, Misao*; Tobita, Hiroshi; Mori, Takamasa

Nippon Genshiryoku Gakkai Wabun Rombunshi, 3(2), p.185 - 192, 2004/06

no abstracts in English

JAEA Reports

Summary of the Meeting on the Interactions of MeV Energy Region Cluster Ions with Materials; February 20-21, 2003, JAERI, Takasaki, Japan

Research Committee for Frontier Radiation Application; Subcommittee for Future Plan for Beam Application

JAERI-Review 2004-009, 122 Pages, 2004/04

JAERI-Review-2004-009.pdf:9.68MB

Studies of MeV energy cluster ion irradiation are scientifically and industrially a quite frontier field, and the door is just open. The investigation of interactions with substances, materials modifications, and development of surface analytical methods using MeV energy cluster ions are very exciting regions. Because the TIARA (Takasaki Ion Accelerators for Radiation Applications) is the only facility that MeV energy cluster ions are available in Japan, it is expected to propel those studies, and to explore the possibility as new ion beam. The first meeting on the interaction of MeV energy region cluster ions with materials was held on February 20-21, at JAERI Takasaki to discuss the status and the trend for MeV cluster experiments which were carried out at Takasaki. This report summarizes the contents of presentations made in the meeting.

Journal Articles

Neutron transmission experiment of boron-doped resin for the JT-60SC neutron shield using 2.45 MeV neutron source

Morioka, Atsuhiko; Sato, Satoshi; Ochiai, Kentaro; Sakasai, Akira; Hori, Junichi; Yamauchi, Michinori*; Nishitani, Takeo; Kaminaga, Atsushi; Masaki, Kei; Sakurai, Shinji; et al.

Journal of Nuclear Science and Technology, 41(Suppl.4), p.109 - 112, 2004/03

Neutron shielding material of the port section of JT-60 superconducting modification (JT-60SC) serves as a design which used resin (KRAFTON-HB4) excellent in the temperature characteristic from polyethylene. In order to make port weight mitigate and reduce the nuclear heating of the superconducting coil, we were developed the resin which added natural BORON to resin. The 2.45MeV neutron generated in the D-D reaction was irradiated, the penetration of the neutron was measured in some kinds of samples which changed the amount of BORON, and the shielding performance of the resin containing BORON was compared with them. The penetration rates of fast neutron flux do not depend on the doped density of boron in both measurements. Whereas the penetration rates of thermal neutron flux in the resin with 2 wt% B are about 25% lower than those with 1 wt% at the back surface of the test specimens.

Journal Articles

Shutdown dose evaluation experiment for ITER

Morimoto, Yuichi*; Ochiai, Kentaro; Sato, Satoshi; Hori, Junichi; Yamauchi, Michinori*; Nishitani, Takeo

Fusion Engineering and Design, 69(1-4), p.643 - 648, 2003/09

 Times Cited Count:2 Percentile:79

no abstracts in English

Journal Articles

Development of high performance negative ion sources and accelerators for MeV class neutral beam injectors

Taniguchi, Masaki; Hanada, Masaya; Iga, Takashi*; Inoue, Takashi; Kashiwagi, Mieko; Morishita, Takatoshi; Okumura, Yoshikazu; Shimizu, Takashi; Takayanagi, Tomohiro; Watanabe, Kazuhiro; et al.

Nuclear Fusion, 43(8), p.665 - 669, 2003/08

 Times Cited Count:11 Percentile:60.77(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Observation of transient current induced in silicon carbide diodes by ion irradiation

Oshima, Takeshi; Lee, K. K.; Onoda, Shinobu; Kamiya, Tomihiro; Oikawa, Masakazu*; Laird, J. S.; Hirao, Toshio; Ito, Hisayoshi

Nuclear Instruments and Methods in Physics Research B, 206(1-4), p.979 - 983, 2003/05

 Times Cited Count:8 Percentile:45.65

Ion beam induced current for pn SiC diode was observed by using MeV range ion beams.The diodes used in this study were pn diode fabricated on n-type epitaxial 6H-SiC. The p region was formed using Al-ion implantation at 800 $$^{o}$$C and subsequent annealing at 1800 $$^{o}$$C. The value of charge collection for diode applied to 30V by 12MeV-Ni microbeam irradiationis estimated to be (1.7-1.8)$$times$$10$$^{-13}$$Q from the analyzing transient-IBIC measurement.The efficiency of the charge collection is 85-93%.

Journal Articles

The JAERI-KEK joint RIB project

Takeuchi, Suehiro

AIP Conference Proceedings 680, p.229 - 236, 2003/00

JAERI and KEK-Institute of Particle and Nuclear Studies are collabarating to build an ISOL-type radioactive ion beam(RIB) acceleration system in the JAERI-Tokai tandem accelerator lab. In this project, the tandem accelerator is used as a proton beam driver to create RIB from fission products of a uranium target and a RIB accelerator already built by KEK will be installed in an old target room of the tandem accelerator lab. The beam energy is 1.1 MeV/nucleon, which is not sufficient for experiments related to nuclear reactions. They have a plan to boost the beams to 5 - 9 MeV/u by developing a pre-booster and using existing super-conducting tandem-booster. The plan of this project, acceleration divices and present status will be outlined in the RIB session of the CAARI.

Journal Articles

In situ transmissivity measurements of KU1 quartz in the UV range under 14 Mev neutron irradiation

Nishitani, Takeo; Sugie, Tatsuo; Kasai, Satoshi; Kaneko, Junichi*; Yamamoto, Shin

Journal of Nuclear Materials, 307-311(Part2), p.1264 - 1267, 2002/12

 Times Cited Count:22 Percentile:18.71

no abstracts in English

JAEA Reports

Curves and tables of neutron cross sections in JENDL-3.3

Nakagawa, Tsuneo; Kawasaki, Hiromitsu*; Shibata, Keiichi

JAERI-Data/Code 2002-020, 327 Pages, 2002/11

JAERI-Data-Code-2002-020-Part1.pdf:12.62MB
JAERI-Data-Code-2002-020-Part2.pdf:18.38MB

no abstracts in English

Journal Articles

Fusion power measurement based on $$^{16}$$O(n,p)$$^{16}$$N reaction in flowing water

Nishitani, Takeo; Uno, Yoshitomo; Kaneko, Junichi*; Ochiai, Kentaro; Maekawa, Fujio

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1139 - 1142, 2002/08

no abstracts in English

JAEA Reports

Design of neutron monitor using flowing water activation for ITER

Nishitani, Takeo; Ebisawa, Katsuyuki*; Walker, C.*; Kasai, Satoshi

JAERI-Tech 2002-033, 40 Pages, 2002/03

JAERI-Tech-2002-033.pdf:1.54MB

no abstracts in English

JAEA Reports

Reliability assessment of high energy particle induced radioactivity calculation code DCHAIN-SP 2001 by analysis of integral activation experiments with 14MeV neutrons

Kai, Tetsuya; Maekawa, Fujio; Kasugai, Yoshimi; Kosako, Kazuaki*; Takada, Hiroshi; Ikeda, Yujiro

JAERI-Research 2002-005, 65 Pages, 2002/03

JAERI-Research-2002-005.pdf:2.75MB

Reliability assessment for the High Energy Particle Induced Radioactivity Calculation Code DCHAIN-SP 2001 was carried out through analysis of integral activation experiments with 14-MeV neutrons. The following three series of experiments conducted at the D-T neutron source facility, FNS, in JAERI were employed: (1) the decay gamma-ray measurement experiment for fusion reactor materials, (2) the decay heat measurement experiment for 32 fusion reactor materials, and (3) the integral activation experiment on mercury.As a result, it was found that the calculations with DCHAIN-SP 2001 predicted the experimental data for (1)$$sim$$(3) approximately within 30%, 20% and 20%, respectively. It was concluded that the activation cross section data below 20 MeV and the associated decay data as well as the calculation algorithm for solving the Beteman equation that was the master equation of DCHAIN-SP were adequate.

213 (Records 1-20 displayed on this page)