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Teshigawara, Makoto; Nakamura, Mitsutaka; Kinsho, Michikazu; Soyama, Kazuhiko
JAEA-Technology 2021-022, 208 Pages, 2022/02
JAEA-Technology-2021-022.pdf:14.28MB
The Materials and Life science experimental Facility (MLF) is an accelerator driven pulsed spallation neutron and muon source with a 1 MW proton beam. The construction began in 2004, and we started beam operation in 2008. Although problems such as exudation of cooling water from the target container have occurred, as of April 2021, the proton beam power has reached up to 700 kW gradually, and stable operation is being performed. In recent years, the operation experience of the rated 1 MW has been steadily accumulated. Several issues such as the durability of the target container have been revealed according to the increase in the operation time. Aiming at making a further improvement of MLF, we summarized the current status of achievements for the design values, such as accelerator technology (LINAC and RCS), neutron and muon source technology, beam transportation of these particles, detection technology, and neutron and muon instruments. Based on the analysis of the current status, we tried to extract improvement points for upgrade of MLF. Through these works, we will raise new proposals that promote the upgrade of MLF, attracting young people. We would like to lead to the further success of researchers and engineers who will lead the next generation.
Oguri, Hidetomo
Proceedings of 29th International Linear Accelerator Conference (LINAC 2018) (Internet), p.29 - 34, 2019/01
Urano, Hajime; Kamada, Yutaka; Takizuka, Tomonori; Suttrop, W.*; Horton, L.*; Lang, P.*; Kubo, Hirotaka; Oyama, Naoyuki; Takenaga, Hidenobu; Asakura, Nobuyuki
Purazuma, Kaku Yugo Gakkai-Shi, 81(4), p.280 - 287, 2005/04
Role of the pedestal structure in ELMy H-mode plasmas for the core energy confinement and for the ELM energy losses have been investigated in JT-60U and ASDEX Upgrade. The confinement degradation seen at higher densities is attributed to the reduction of the pedestal temperature limited by the ELM activities and the stiffness of the temperature profiles. In high triangularity or impurity seeded H-modes, in which higher energy confinement is generally achieved, higher pedestal temperature is obtained by the improvement of the edge MHD stability or the density profile peaking, respectively. The upper bound of the ELM energy loss is characterised by the pedestal energy. The energy transport in between ELMs enhanced with increasing the pedestal collisionality reduces the ELM loss power fraction. It is also shown in ASDEX Upgrade that the continuous pellet injection is valid for the integrated performance of smaller ELM losses and favourable core confinement.
Subcommittee for Neutron Beam Utilization; Status and Future Upgrades of the Facilities and Instruments
JAERI-Review 2003-037, 88 Pages, 2004/02
JAERI-Review-2003-037.pdf:6.98MB
The refurbished JRR-3 reached critical in March 1990, and the facilities were opened to the general user program in June 1991. Since then the improved specification and the increase of the beam flux of JRR-3 made it recognized as one of the top four research reactors in the world. Despite the ten fruitful years of achievements in research activities performed at JRR-3, it is indispensable to continuously upgrade and improve research facilities in order to maintain our standard of excellence in the research activities. It is also important that the high intensity proton accelerator project (J-PARC project) is progressing in the same JAERI site. Under these circumstances surrounding the JRR-3 facility, a task force under the neutron beam utilization committee was formed in 2001 and assigned to recommend the necessary upgrade and improvements of reactor facilities as well as neutron scattering instruments in JRR-3. This report summarizes analysis and discussions carried out in the task force during these two years, and describes recommendations from the task force.
Nakamura, Yukiharu; Pautasso, G.*; Gruber, O.*; Jardin, S. C.*
Plasma Physics and Controlled Fusion, 44(8), p.1471 - 1481, 2002/08
Times Cited Count：13 Percentile：38.1(Physics, Fluids & Plasmas)no abstracts in English
Nakamura, Yukiharu; Yoshino, Ryuji; Granetz, R. S.*; Pautasso, G.*; Gruber, O.*; Jardin, S. C.*
Purazuma, Kaku Yugo Gakkai-Shi, 78(4), p.347 - 355, 2002/04
no abstracts in English
Kimura, Toyoaki; Kurihara, Kenichi; Kawamata, Yoichi; Akiba, K.*; ; Terakado, Tsunehisa; Yoshino, Ryuji
Fusion Technology, 32(3), p.404 - 415, 1997/11
no abstracts in English
Kimura, Toyoaki; JT-60 Team
Proc. of the 14th Symp. on Fusion Engineering,Vol. 2, p.860 - 866, 1992/00
no abstracts in English
Nishitani, Takeo; Takeuchi, Hiroshi; Barnes, C. W.*; Iguchi, Tetsuo*; Nagashima, Akira; Kondoh, Takashi; Sakasai, Akira; Itami, Kiyoshi; Tobita, Kenji; Nagashima, Keisuke; et al.
JAERI-M 91-176, 23 Pages, 1991/10
no abstracts in English
Shirakata, Hirofumi
Fusion Engineering and Design, 14, p.7 - 19, 1991/00
Times Cited Count：1 Percentile：19.9(Nuclear Science & Technology)no abstracts in English
Horiike, Hiroshi; Ando, Toshiro; *; Matsukawa, Makoto; Neyatani, Yuzuru; Ninomiya, Hiromasa; Yamamoto, Masahiro
Fusion Engineering and Design, 16, p.285 - 292, 1991/00
Times Cited Count：16 Percentile：83(Nuclear Science & Technology)no abstracts in English
Onishi, Nobuaki; Takahashi, Hidetake; Takayanagi, Masaji; Ichikawa, Hiroki; Kawasaki, Minoru
Nihon Genshiryoku Gakkai-Shi, 32(10), p.962 - 969, 1990/10
Times Cited Count：4 Percentile：47.11(Nuclear Science & Technology)no abstracts in English
; ; ; *
JAERI-M 86-155, 35 Pages, 1986/11
no abstracts in English
; ; *
JAERI-M 86-153, 99 Pages, 1986/11
no abstracts in English
; ; ; ; ; *
JAERI-M 85-105, 113 Pages, 1985/07
no abstracts in English
