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Collaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2023-048, 151 Pages, 2024/05
JAEA-Review-2023-048.pdf:8.48MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2022. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2021, this report summarizes the research results of the "Development of a hybrid method for evaluating the long-term structural soundness of nuclear reactor buildings using response monitoring and damage imaging technologies" conducted in FY2022. The present study aims to develop an evaluation method necessary to obtain a perspective on the long term structural soundness of accident-damaged reactor buildings, where accessibility to work sites is extremely limited due to high radiation dose rate and high contamination. In FY2022, the second year of the three-year plan, some tests and other activities on the following research items were conducted following FY2021, based on the specific research methods and research directions clarified in FY2021.
Collaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2022-071, 123 Pages, 2023/03
JAEA-Review-2022-071.pdf:6.07MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2021. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2021, this report summarizes the research results of the "Development of a hybrid method for evaluating the long-term structural soundness of nuclear reactor buildings using response monitoring and damage imaging technologies" conducted in FY2021. The present study aims to develop an evaluation method necessary to obtain a perspective on the long-term structural soundness of accident-damaged reactor buildings, where accessibility to work sites is extremely limited due to high radiation dose rate and high contamination. In FY2021, the first year of the three-year plan, the following research items were undertaken by clarifying specific research methods, setting research directions, making necessary preparations, and conducting some tests and other activities.
Katsumi, Toshiyuki; Yoshida, Yasuhito*; Nakagawa, Ryo*; Yazawa, Shinya*; Kumada, Masashi*; Sato, Daisuke*; Thwe Thwe, A.; Chaumeix, N.*; Kadowaki, Satoshi
Journal of Thermal Science and Technology (Internet), 16(2), p.21-00044_1 - 21-00044_13, 2021/00
Times Cited Count：6 Percentile：40.36(Thermodynamics)The effects of addition of CO
and water vapor on characteristics of dynamic behavior of hydrogen/air premixed flames were elucidated experimentally. By Schlieren photography, wrinkles on the flame surface were clearly observed in low equivalence ratios. The propagation velocity increased monotonically as the flame radius became larger and flame acceleration was found. Increasing the addition of inert gas, the propagation velocity decreased, especially in the case of CO addition. Moreover, the Markstein length and the wrinkling factor decreased. This indicated that the addition of Co or HO promoted the unstable motion of hydrogen flames, which could be due to the enhancement of the diffusive-thermal effect. Based on the characteristics of dynamic behavior of hydrogen flames, the parameters used in the mathematical model on propagation velocity including flame acceleration was obtained, and then the flame propagation velocity under various conditions was predicted.
Motegi, Kosuke; Trianti, N.; Matsumoto, Toshinori; Sugiyama, Tomoyuki; Maruyama, Yu
Proceedings of 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18) (USB Flash Drive), p.4324 - 4335, 2019/08
Trianti, N.; Sato, Masatoshi*; Sugiyama, Tomoyuki; Maruyama, Yu
Proceedings of 11th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-11) (Internet), 7 Pages, 2018/11
Matsumoto, Toshinori; Sato, Masatoshi; Sugiyama, Tomoyuki; Maruyama, Yu
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 6 Pages, 2017/07
Secretariat of Symposium on Advanced Photon Research
JAEA-Conf 2016-001, 53 Pages, 2016/03
The 16th Symposium on Advanced Photon Research was held at Kansai Photon Science Institute, Japan Atomic Energy Agency (JAEA-KPSI) in Kizugawa city, Kyoto on October 15 - 16, 2015. This report consists of invited and contributed papers presented at the oral and poster sessions in the Symposium.
Nishiuchi, Mamiko; Sakaki, Hironao; Esirkepov, T. Z.; Nishio, Katsuhisa; Pikuz, T. A.*; Faenov, A. Ya.*; Pirozhkov, A. S.; Sagisaka, Akito; Ogura, Koichi; Kanasaki, Masato; et al.
Research Using Extreme Light; Entering New Frontiers with Petawatt-Class Lasers II (Proceedings of SPIE, Vol.9515), p.95151D_1 - 95151D_4, 2015/06
Times Cited Count：0 Percentile：0(Engineering, Electrical & Electronic)Experimental demonstration of multi-charged heavy ion acceleration from the interaction between the ultra-intense short pulse laser system and the metal target is presented. The laser pulse of 
10 J laser energy, 36 fs pulse width, and the contrast level of 
10
from 200 TW class Ti:sapphire J-KAREN laser system at JAEA is used in the experiment. Almost fully stripped Fe ions accelerated up to 0.9 GeV are demonstrated. This is achieved by the high intensity laser field of 10
Wcm
interacting with the solid density target. The demonstrated iron ions with high charge to mass ratio (Q/M) is difficult to be achieved by the conventional heavy ion source technique in the accelerators.
Kato, Yuki; Yoshida, Hiroyuki; Yokoyama, Ryotaro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 8 Pages, 2015/05
Ishii, Yasuyuki; Okubo, Takeru; Kamiya, Tomihiro; Saito, Yuichi
Nuclear Instruments and Methods in Physics Research B, 348, p.79 - 82, 2015/04
Times Cited Count：2 Percentile：17.42(Instruments & Instrumentation)Bulanov, S. S.*; Esarey, E.*; Schroeder, C. B.*; Bulanov, S. V.; Esirkepov, T. Z.; Kando, Masaki; Pegoraro, F.*; Leemans, W. P.*
Physical Review Letters, 114(10), p.105003_1 - 105003_5, 2015/03
Times Cited Count：32 Percentile：82.77(Physics, Multidisciplinary)Lezhnin, K.*; Kamenets, F. F.*; Beskin, V.*; Kando, Masaki; Esirkepov, T. Z.; Bulanov, S. V.
Physics of Plasmas, 22(3), p.033112_1 - 033112_9, 2015/03
Times Cited Count：6 Percentile：28(Physics, Fluids & Plasmas)Nishiuchi, Mamiko; Sakaki, Hironao; Esirkepov, T. Z.; Nishio, Katsuhisa; Pikuz, T.*; Faenov, A.*; Skobelev, I. Yu.*; Orlandi, R.; Sako, Hiroyuki; Pirozhkov, A. S.; et al.
Physics of Plasmas, 22(3), p.033107_1 - 033107_8, 2015/03
Times Cited Count：72 Percentile：96.81(Physics, Fluids & Plasmas)Almost fully stripped Fe ions accelerated up to 0.9 GeV are demonstrated with a 200 TW femtosecond high-intensity laser irradiating a micron-thick Al foil with Fe impurity on the surface. An energetic low-emittance high-density beam of heavy ions with a large charge-to-mass ratio can be obtained, which is useful for many applications, such as a compact radio isotope source in combination with conventional technology.
Yoshida, Hiroyuki; Nagatake, Taku; Takase, Kazuyuki; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*
Mechanical Engineering Journal (Internet), 1(4), p.TEP0025_1 - TEP0025_11, 2014/08
O
laser system JLITE-X for laser-excited ion accelerator researchMori, Michiaki; Pirozhkov, A.; Nishiuchi, Mamiko; Ogura, Koichi; Sagisaka, Akito; Hayashi, Yukio; Orimo, Satoshi; Fukumi, Atsushi*; Li, Z.*; Kado, Masataka; et al.
Laser Physics, 16(7), p.1092 - 1096, 2006/07
Times Cited Count：36 Percentile：80.07(Optics)no abstracts in English
-ion beams for ITER neutral beam systemTaniguchi, Masaki; Inoue, Takashi; Kashiwagi, Mieko; Watanabe, Kazuhiro; Hanada, Masaya; Seki, Takayoshi*; Dairaku, Masayuki; Sakamoto, Keishi
Review of Scientific Instruments, 77(3), p.03A514_1 - 03A514_4, 2006/03
Times Cited Count：15 Percentile：58.51(Instruments & Instrumentation)In the ITER NB systems, conventional gas insulation technology cannot be utilized because of the conductivity of the insulation gas caused by the radiation from the tokamak plasma. To overcome this problem, a vacuum insulated beam source (VIBS), where the whole beam source is immersed in vacuum, has been developed in JAERI. Recently, voltage holding capability of the VIBS was drastically improved by installing the large stress ring and these progress enables us to perform the high power operation of the VIBS accelerator. For high current density H- beam acceleration, modifications were made on KAMABOKO source. At present, H- beam current density is 146 A/m
at 836 keV (input arc power; 40 kW, operation pressure; 0.3 Pa).The acceleration of 900 keV, 0.1 A level beam was accomplished for 175 shots during the test campaign. The beam acceleration was quite stable and the degradation of the voltage holding due to the beam acceleration and/or Cs seeding was not observed.
Kurashima, Satoshi; Miyawaki, Nobumasa; Okumura, Susumu; Ishibori, Ikuo; Yoshida, Kenichi; Kashiwagi, Hirotsugu; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Nakamura, Yoshiteru
JAEA-Review 2005-001, TIARA Annual Report 2004, p.349 - 351, 2006/01
A flat-top acceleration system using fifth-harmonic frequency for the JAERI AVF cyclotron was developed to minimize the energy spread of an ion beam mainly for microbeam formation with a spot size of 1 micron in diameter by focusing with a set of quadrupole magnets. A single-turn extraction is an indispensable condition to reduce the energy spread without significant beam loss by the flat-top acceleration. In order to save time for the single-turn extraction tuning over measuring time distribution of the beam bunch, a deflector probe has been developed to observe the turn separation and the radial beam width. In this paper, we report the single-turn extraction technique with the deflector probe. As a result of beam developments, the single-turn extraction can be achieved in one or two hours and radioactivity of the deflector electrode can be also reduced in the acceleration of a high energy proton beam.
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
Kansai Research Establishment
JAERI-Conf 2005-004, 243 Pages, 2005/06
JAERI-Conf-2005-004.pdf:16.74MB
This report consists of 55 contributed papers of the 6th Symposium on Advanced Photon Research, which was held at JAERI-Kansai in Kyoto on November 4-5, 2004. The numbers of speeches were 16, including 5 invited speeches and the numbers of poster presentations were 56, including the report of presentations and cooperative research and joint research performed in FY2003.
negative hydrogen ion beams in a 1 MeV vacuum insulated beam sourceTaniguchi, Masaki; Inoue, Takashi; Kashiwagi, Mieko; Hanada, Masaya; Watanabe, Kazuhiro; Seki, Takayoshi*; Sakamoto, Keishi
AIP Conference Proceedings 763, p.168 - 175, 2005/04
The accelerator for the ITER NB system is required to produce 1 MeV, 40 A D-ion beams for 16.5 MW neutral beam injection per module. In the ITER NB system, conventional gas insulated beam source cannot be adopted because of the radiation-induced conductivity of the insulation gas. Thus a vacuum insulated beam source (VIBS), where the whole beam source is immersed in vacuum, had been developed in JAERI. Recently, voltage holding capability of the VIBS was drastically improved by installing the large stress ring, which reduces the electric field concentration at the negative side triple junction. Having improved the voltage holding capability of the VIBS, the H ion beams were extracted with seeding cesium to enhance the negative ion currents. Up to now, we had been succeeded in accelerating the H beam of 102 A/m (140 mA) at 800 keV. The beam acceleration was quite stable and accomplished for several hundreds shots in several experimental campaigns.
