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Nakajima, Taro*; Watanabe, Masao; Inamura, Yasuhiro; Tamatsukuri, Hiromu; 8 of others*
Physical Review Research (Internet), 6(2), p.023109_1 - 023109_9, 2024/05
Ge spectrometerKoizumi, 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：42.64(Instruments & Instrumentation)In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4 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 Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.
Yoshida, Yoichi*; Yang, J.*; Kondo, Takafumi*; Seki, Shuhei*; Kozawa, Takahiro*; Tagawa, Seiichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji; Namba, Hideki
JAEA-Review 2005-001, TIARA Annual Report 2004, p.183 - 185, 2006/01
A heavy-ion-pulse radiolysis technology was developed using a single-photon-counting system. In the system, the ion beam was injected a thin scintillator before irradiating the sample. The light emitted from the scintillator by the ion irradiation was used as analyzing source to detect the absorption of primary species in water. Measurement of time-dependent absorption of hydrated electrons in water was achieved using the system, which demonstrates the usefulness of this technique.
Takei, Hayanori; Kobayashi, Hitoshi*
Journal of Nuclear Science and Technology, 42(12), p.1032 - 1039, 2005/12
Times Cited Count：3 Percentile：23.05(Nuclear Science & Technology)In high-intensity proton accelerator facilities, a failure of an electromagnet that steers beam pulses may result in thermal shock damage on the accelerator component by injecting an out-of-control pulse. It is important that a Machine Protection System (MPS) is appropriately designed to prevent this damage in the facilities such as Japan Proton Accelerator Research Complex (J-PARC). In this study, the simple evaluation method for the allowable injection time before the operation of the MPS was derived from the relation between the thermal stress and the yield stress of materials.The derived evaluation method was then applied to J-PARC. The allowable injection time for each component ranged from 0.1 to 70 
s.
Kai, Tetsuya; Harada, Masahide; Teshigawara, Makoto; Watanabe, Noboru; Kiyanagi, Yoshiaki*; Ikeda, Yujiro
Nuclear Instruments and Methods in Physics Research A, 550(1-2), p.329 - 342, 2005/09
Times Cited Count：20 Percentile：75.79(Instruments & Instrumentation)Neutronic study was performed on coupled hydrogen moderators to maximize time-integrated and pulse-peak intensities of slow neutrons when a large number of beams was required. The total increased with the number of beams, although the average decreased due to a reflector-missing by the beam extraction holes in the reflector. At a large beam extraction angle (25 degree), the spatial distribution of the vector-flux of neutrons was undesirable for a rectangular shape moderator. As an alternative we proposed a cylindrical shape one, resulting in a much improved spatial distribution. In addition, neutronic performance was calculated as a function of the diameter, indicating the optimal diameter was about 140 mm. The cylindrical one gave higher pulse-peak intensities with narrower pulse widths without penalty in time-integrated intensities and pulse decay characteristics, providing a more uniform angle-dependence. Some explanations are given for the difference in the pulse characteristics between the two. We decided to adopt the cylindrical one for the Japanese spallation neutron source.
Koppitz, T.*; Jung, P.*; M
ller, G.*; Weisenburger, A.*; Futakawa, Masatoshi; Ikeda, Yujiro
Journal of Nuclear Materials, 343(1-3), p.92 - 100, 2005/08
Times Cited Count：8 Percentile：47.10(Materials Science, Multidisciplinary)Cavitation damage of structural materials due to pressure waves is expected to be one of the majior life-time limiting factors in high power liquid metal spallation targets under pulsed operation. Two methods are developed for the European Spallation Source (ESS) to mitigate this damage: Introduction of gas bubbles to surpress the pressure pulse and surface-hardening of structural materials. Surface-hardening of four 8-13%Cr martenstic steels was examined by thermal treatment with pulsed or scanned electron- and laser-beams as well as by nitriding in plasma. A specimens of the 12%Cr steel were tested in liquid mercury under pulsed proton irradiation, and under mechanical pulsed-loading. Surface damage was analysed by optical, confocal-laser, or scanning-electron microscopy, showing in both tests much better resistance of the hardened material compared to standard condition.
Watanabe, Daisuke*; Che, D.-C.*; Fukuyama, Tetsuya*; Hashinokuchi, Michihiro*; Teraoka, Yuden; Kasai, Toshio*
Review of Scientific Instruments, 76(5), p.055108_1 - 055108_5, 2005/05
Times Cited Count：6 Percentile：32.42(Instruments & Instrumentation)A molecular beam technique for generating an intense pulsed hyperthermal molecular beam (HTMB) was developed. The beam source consists of a pulse valve, a cooling-water bottle that protectes the pulse valve from heat transfer of a high temperature nozzle, and the nozzle with a heater. The pulsed HTMB of HCl was practically generated and characterized by means of (2+1) resonance-enhanced multiphoton ionization and ion time-of-flight techniques.
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.
Okada, Sohei; Sunaga, Hiromi; ; Kawasuso, Atsuo; ; ; Takizawa, Haruki; Yotsumoto, Keiichi
Proc. of 11th Symp. on Accelerator Sci. and Technol., p.107 - 109, 1997/00
no abstracts in English
Watanabe, Kazuhiro; Hanada, Masaya; Inoue, Takashi; ; Mizuno, Makoto; Ohara, Yoshihiro; Okumura, Yoshikazu; Suzuki, Yasuo*; Tanaka, Hideki*; Tanaka, Masanobu*
Proc. of 14th Int. Conf. on Plasma Physics and Controlled Nuclear Fusion Research, p.371 - 378, 1993/00
no abstracts in English
Yokota, Wataru; Fukuda, Mitsuhiro; Arakawa, Kazuo; Nakamura, Yoshiteru; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; ; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.581 - 584, 1993/00
no abstracts in English
ion sourceOkumura, Yoshikazu; Hanada, Masaya; Inoue, Takashi; Mizuno, Makoto; Ohara, Yoshihiro; Suzuki, Yasuo*; Tanaka, Hideki*; Tanaka, M.*; Watanabe, Kazuhiro
Review of Scientific Instruments, 63(4), p.2708 - 2710, 1992/04
Times Cited Count：24 Percentile：86.28(Instruments & Instrumentation)no abstracts in English
Tachikawa, T.*; ; ; ; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Agematsu, Takashi; Nara, Takayuki; et al.
Proceedings of the International Conference on Evolution in Beam Applications, p.270 - 274, 1992/00
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tanaka, Ryuichi; et al.
Proceedings of the International Conference on Evolution in Beam Applications, p.264 - 268, 1992/00
no abstracts in English
-sticking phenomena in muon catalyzed fusion for a high density D-T mixture with 30% tritium concentrationNagamine, Kanetada*; Matsuzaki, Teiichiro*; Ishida, Katsuhiko*; ; ; ; Miyake, Yasuhiro*; ; ; ; et al.
Muon Catal. Fusion, 5-6, p.289 - 295, 1991/00
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tanaka, Ryuichi; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.34 - 36, 1991/00
no abstracts in English
; ; ;
Plasma Physics and Controlled Nuclear Fusion Research 1984, Vol.l, p.665 - 672, 1985/00
no abstracts in English
Hotta, Hiroshi; ; ;
JAERI 1278, 75 Pages, 1982/06
no abstracts in English
; Araki, Masanori; ; ; ; ; ; Matsuda, Shinzaburo; ; ; et al.
JAERI-M 82-045, 13 Pages, 1982/05
no abstracts in English
; Araki, Masanori; ; ; ; ; ; Matsuda, Shinzaburo; ; ; et al.
Review of Scientific Instruments, 53(12), p.1864 - 1869, 1982/00
Times Cited Count：20 Percentile：87.50(Instruments & Instrumentation)no abstracts in English
