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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, 59(9), p.1174 - 1205, 2022/09
Times Cited Count：5 Percentile：87.42(Nuclear Science & Technology)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.
Shibano, Koya; Abe, Katsuo; Tsukasa, Kazuo*; Hosogane, Tatsuya; Kayano, Masashi; Sumi, Mika; Fujiwara, Hideki*; Yamaguchi, Kazuya*; Motoki, Chika*
Dai-41-Kai Nihon Kaku Busshitsu Kanri Gakkai Nenji Taikai Kaigi Rombunshu (Internet), 4 Pages, 2020/11
Large-sized dried spikes, called LSD spike, are used as reference material for accountancy analysis for Plutonium and Uranium by Isotope Dilution Mass Spectrometry. LSD spikes preparation is performed each steps as followed (1) Preparing Plutonium and Uranium mix solution, (2) Aliquoting mix solution to vials, and (3) Drying. J-MOX have planned prepared in-house LSD spike and utilized it for accountancy analysis. If LSD spikes are stored for long term, dried material peel off from bottom of vial and it may affect analytical results. In this study, LSD spikes, which have composition suitable for accountancy analysis in J-MOX, had been stored for about 2 years, then long-term stability of LSD spikes had been evaluated.
Kusaka, Katsuhiro*; Hosoya, Takaaki*; Yamada, Taro*; Tomoyori, Katsuaki; Ohara, Takashi; Katagiri, Masaki*; Kurihara, Kazuo; Tanaka, Ichiro*; Niimura, Nobuo*
Journal of Synchrotron Radiation, 20(6), p.994 - 998, 2013/11
Times Cited Count：37 Percentile：85.87(Instruments & Instrumentation)The IBARAKI biological crystal diffractometer, iBIX, is a high-performance time-of-flight neutron single-crystal diffractometer for elucidating mainly the hydrogen, protonation and hydration structures of biological macromolecules in various life processes. Since the end of 2008, iBIX has been available to user's experiments supported by Ibaraki University. Since August 2012, an upgrade of the 14-existing detectors has begun and 16 new detectors have been installed for iBIX. The total measurement efficiency of the present diffractometer has been impoved by one order of magnitude from the previous one with the increasing of accelerator power. In December 2012, commissioning of the new detectors was successful, and collection of the diffraction dataset of ribonucrease A as a standard protein was attempted in order to estimate the performance of the upgraded iBIX in comparison with previous results. The resolution of diffraction data, equivalence among intensities of symmetry-related reflections and reliability of the refined structure have been improved dramatically. iBIX is expected to be one of the highest-performance neutron single-crystal diffractometers for biological macromolecules in the world.
Miyabe, Masabumi; Kato, Masaaki; Oba, Masaki; Wakaida, Ikuo; Watanabe, Kazuo; Wendt, K.*
Japanese Journal of Applied Physics, Part 1, 45(5A), p.4120 - 4122, 2006/05
Times Cited Count：2 Percentile：8.69(Physics, Applied)We developed a frequency-stabilized diode laser using magnetically induced circular dichroism. From a spectroscopic study on Rb-
line, the most stable Doppler-broadened and Doppler-free lines were determined to be the transition from 
g=2 ground state of 
Rb and the crossover resonance from g=3 ground state to e=3 and 4 excited states of Rb respectively. Furthermore, we measured the fluctuation of the laser locked to the Doppler-free line to be 
50kHz/8hour and thus revealed the applicability to a several-hours stabilization. The developed laser can be used as a reference laser for frequency stabilization system for multiple tunable lasers for RIMS analysis.
Miyabe, Masabumi; Oba, Masaki; Kato, Masaaki; Wakaida, Ikuo; Watanabe, Kazuo
Journal of Nuclear Science and Technology, 43(4), p.305 - 310, 2006/04
Times Cited Count：13 Percentile：65.77(Nuclear Science & Technology)We are developing an resonance ionization spectrometric apparatus aiming at an analysis of a radioactive isotope of calcium (
Ca) in nuclear waste materials. The developed system consists of the reference laser whose frequency was locked on a Doppler-free absorption line of 85Rb and the computer-controlled fringe offset lock system which transfer frequency stability of the reference laser to slave lasers for Ca excitation. With heterodyne spectroscopy and laser induced fluorescence spectroscopy of Ca, it was confirmed that the developed apparatus was suitable for resonance ionization spectrometric analysis.
Miyabe, Masabumi; Geppert, C.*; Kato, Masaaki; Oba, Masaki; Wakaida, Ikuo; Watanabe, Kazuo; Wendt, K. D. A.*
Journal of the Physical Society of Japan, 75(3), p.034302_1 - 034302_10, 2006/03
Times Cited Count：18 Percentile：67.21(Physics, Multidisciplinary)High-resolution resonance ionization spectroscopy has been utilized to determine a precise ionization potential of Ca. Three-step resonance excitation with single-mode extended cavity diode lasers populates long and unperturbed Rydberg series of 4snp (1P1) and 4snf (1F3) states in the rage of n=20-150. By using an extended Ritz formula for quantum defect, the series convergence limit has been determined to be 49305.9240 (20) cm
with the accuracy improved one order of magnitude higher than previously reported ones.
Miyabe, Masabumi; Oba, Masaki; Kato, Masaaki; Wakaida, Ikuo; Watanabe, Kazuo
JAERI-Tech 2005-043, 27 Pages, 2005/08
JAERI-Tech-2005-043.pdf:2.51MB
Multi-step resonance ionization spectrometry for long-lived nuclei in nuclear waste materials requires laser sources having high frequency stability and tunability. In this study we have developed a novel frequency control system consisting of digital circuitry and computer to improve the frequency tunability of the developed laser stabilization system using dichroic atomic vapor laser lock (DAVLL) and fringe offset lock (FOL) techniques. Based on the heterodyne experiment and multi-step laser induced fluorescence spectroscopy of atomic Ca, the frequency stability and tunability of the developed system were evaluated.
Ca ionization potential by high-precision three-step resonance ionization spectroscopyMiyabe, Masabumi; Oba, Masaki; Kato, Masaaki; Wakaida, Ikuo; Watanabe, Kazuo
JAERI-Research 2004-023, 17 Pages, 2004/11
JAERI-Research-2004-023.pdf:2.71MB
High precision resonance ionization spectroscopy has been applied to determination of an accurate ionization potential of Ca. Three-step resonant excitation with single-mode extended cavity diode lasers populates a series of 
(
P
) and 
(F
) Rydberg states in the rage of 
=20-150. By using an extended Ritz formula for quantum defect, the series convergence limit has been determined to be 49305.9240 (20) cm with the accuracy improved one order of magnitude higher than previously reported ones.
Hino, Ryutaro; Yokomizo, Hideaki; Yamazaki, Yoshishige; Hasegawa, Kazuo; Suzuki, Hiromitsu; Soyama, Kazuhiko; Hayashi, Makoto*; Haga, Katsuhiro; Kaminaga, Masanori; Sudo, Yukio*; et al.
Nihon Kikai Gakkai-Shi, 107(1032), p.851 - 882, 2004/11
no abstracts in English
Miyabe, Masabumi; Kato, Masaaki; Oba, Masaki; Wakaida, Ikuo; Watanabe, Kazuo
JAERI-Tech 2004-065, 19 Pages, 2004/10
JAERI-Tech-2004-065.pdf:0.99MB
In nuclear waste materials there are various radionuclides to which standard analytical techniques are difficult to be applied. We are developing an analytical technique where such nuclides are ionized and mass-analyzed using diode laser based multi-step RIMS technique. The diode laser, however, has one drawback, i.e. its oscillation wavelength is readily drifted by acoustic, electric and optical noise, and thus the laser without frequency stabilization is not suitable for the analysis. In this study, we have developed (1) the diode laser whose frequency is stabilized to an intense absorption line of Rb by Zeeman effect and (2) the stabilization system where diode lasers for 3-step ionization of Ca are locked to the Rb-stabilized laser using a Fabry-perot interferometer. Additionally, to evaluate overall frequency stability of the stabilization system, fluctuations in the photoion and fluorescence signals arising from 3-step RIMS of Ca were simultaneously observed.
Miyabe, Masabumi; Oda, Koichi*; Oba, Masaki; Kato, Masaaki; Wakaida, Ikuo; Watanabe, Kazuo
JAERI-Tech 2004-064, 33 Pages, 2004/10
JAERI-Tech-2004-064.pdf:1.89MB
In nuclear waste materials there are various radionuclides to which standard analytical techniques are difficult to be applied. We are developing an analytical technique where such nuclides are analyzed using multi-step resonance ionization mass spectrometry. In this study, we have developed an external cavity diode laser applicable to the analysis. The wavelength and output power dependence on injection current and temperature were investigated for various types of laser diodes. Based on the data, we have obtained a suitable condition to operate the ECDL in stable single-mode oscillation, so that a continuous scanning range of about 100 GHz was realized. Additionaly, to evaluate the bandwidth of the developed ECDL, we have performed Doppler-free spectroscopy. The reasonable agreement of the measured isotope shift and HFS splitting with the reported values demonstrated that the developed ECDL is applicable to a precise laser spectroscopy as well as a laser trace analysis.
Kukita, Yutaka; Nakamura, Hideo; *; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yonomoto, Taisuke; et al.
JAERI-M 91-040, 122 Pages, 1991/03
no abstracts in English
Kukita, Yutaka; *; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; et al.
JAERI-M 90-039, 122 Pages, 1990/03
no abstracts in English
Kukita, Yutaka; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; Yonomoto, Taisuke; et al.
JAERI-M 89-225, 117 Pages, 1990/01
no abstracts in English
Kukita, Yutaka; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; Yonomoto, Taisuke; et al.
JAERI-M 89-220, 127 Pages, 1990/01
no abstracts in English
study in JFT-2; ; ; ; ; ; ; ; ; ; et al.
JAERI-M 9065, 12 Pages, 1980/09
no abstracts in English
; *; *; Furukawa, Kazuo
Nihon Kikai Gakkai Rombunshu, B, 38(315), p.2897 - 2905, 1972/00
no abstracts in English
Miyabe, Masabumi; Wakaida, Ikuo; Oba, Masaki; Kato, Masaaki; Watanabe, Kazuo
no journal, ,
We have developed a frequency stabilized laser system for RIMS analysis of a long-lived radionuclide of calcium (41Ca) in concrete waste materials. A stable reference laser has been developed using magnetically induced circular dichroism of atomic rubidium. The frequency stability was estimated to be 50kHz over 8 hour period from beat frequency measurement. To transfer the high frequency stability to the other lasers for 3-step excitation of atomic calcium, a computer-controlled fringe offset lock system has been developed as well. By using the system precise frequency tuning of 1MHz error over 1GHz scan was realized. The overall frequency tuning precision was also confirmed by a multistep fluorescence and resonance ionization spectroscopy of calcium.
Miyabe, Masabumi; Oba, Masaki; Kato, Masaaki; Wakaida, Ikuo; Watanabe, Kazuo
no journal, ,
We have been developing a continuous-wave resonance ionization mass spectrometry (cw-RIMS) apparatus aiming at an analysis of Ca radioisotope in nuclear waste materials. The optimum three-step ionization schemes of Ca were investigated and the 4snf (1F3) series members of around n=35 were found to have high isotope-selectivity and efficiency under our experimental conditions. The background noise arising from the thermal ions were negligible at a furnace current of 
1500K. On the basis of these results the abundance sensitivity of 8
10
was demonstrated for 
Ca. Also we extended data on isotope shift and hyperfine structure of 4snf (1F3) series up to n=80.
Miyabe, Masabumi; Oba, Masaki; Wakaida, Ikuo; Kato, Masaaki; Watanabe, Kazuo
no journal, ,
no abstracts in English
