Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ishikawa, Masao; Takeda, Keigo; Itami, Kiyoshi
Fusion Engineering and Design, 109-111(Part B), p.1399 - 1403, 2016/11
Times Cited Count：3 Percentile：23.79(Nuclear Science & Technology)The in-vessel neutron flux monitor equipped with Microfission Chambers (MFCs) has been developed. Since in-vessel components of the MFC are exposed to the extreme ITER environment, such as high radiation, high temperature and high electromagnetic (EM) forces, those components need to withstand such ITER environment. In this study, the in-vessel components of the MFC have been developed in order to apply ITER conditions. For these components, several cases of analyses (neutronic, thermal and EM analysis) and soundness verification tests (high-temperature, vibration and noise immunity test) have been conducted. As a result, it is demonstrated that the in-vessel components of the MFC can be used in the extreme ITER environments for 20 years without any replacements.
O(
) reaction at forward angles and structure of the spin-dipole resonancesKawabata, Takahiro*; Ishikawa, Takatsugu*; Ito, Masatoshi*; Nakamura, M.*; Sakaguchi, Harutaka*; Takeda, H.*; Taki, T.*; Uchida, Makoto*; Yasuda, Yusuke*; Yosoi, Masaru*; et al.
Physical Review C, 65(6), p.064316_1 - 064316_12, 2002/06
Times Cited Count：21 Percentile：70.16(Physics, Nuclear)no abstracts in English
Ito, Masatoshi*; Sakaguchi, Harutaka*; Ishikawa, Takatsugu*; Kawabata, Takahiro*; Murakami, Tetsuya*; Takeda, H.*; Taki, T.*; Tsukahara, N.*; Uchida, Makoto*; Yasuda, Yusuke*; et al.
Nuclear Physics A, 687(1-2), p.52c - 57c, 2001/04
no abstracts in English
O (p,p') experimentKawabata, Takahiro*; Akimune, Hidetoshi*; Fujimura, Hisako*; Fujita, Hirohiko*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Hara, Keigo*; Hatanaka, Kichiji*; Hosono, K.*; Ishikawa, Takatsugu*; et al.
Nuclear Instruments and Methods in Physics Research A, 459(1-2), p.171 - 176, 2001/02
Times Cited Count：18 Percentile：75.08(Instruments & Instrumentation)no abstracts in English
Ishikawa, Masao; Takeda, Keigo*; Kondoh, Takashi; Shimada, Takahiko
no journal, ,
A Microfission Chamber (MFC) provides time-resolved measurements of global neutron source strength and fusion power in ITER. MFCs will be installed behind blanket modules at upper and lower outboard position due to interface considerations with other equipment and the vacuum vessel. Since the location of the MFC is close to the Plasma, sensitivities of MFCs vary due to the change of the plasma position. In this study, a method to obtain neutron source strength accurately has been investigated using Neutron Transport Analysis Code (MCNP) if the plasma position would be changed. As a result, it was found that the linear combination of the MFCs at the upper and lower outboard position, in which weight of change of sensitivity of each MFC due to the change of the plasma position, can keep the output consist within error of 3%.
Ishikawa, Masao; Takeda, Keigo; Kondoh, Takashi; Itami, Kiyoshi
no journal, ,
In ITER, Japan Atomic Energy Agency procures the Microfission chambers (MFC) system. The MFC is the important diagnostics system which measure total neutron emission rate from the plasma and evaluate fusion power from it. Detail designs such as load analyses, soundness verification tests and assembly/installation studies for the in-vessel components has been performed. The results indicated that the in-vessel component can withstand loads imposed during ITER operations and that installation and assembly scheme are clearly shown and that interface between the in-vessel components of the MFC are clearly defined.
Ishikawa, Masao; Takeda, Keigo; Itami, Kiyoshi
no journal, ,
In ITER, Japan Atomic Energy Agency procures the Microfission Chambers (MFC) system. The MFC is the important diagnostics system which measure total neutron emission rate from the plasma and evaluate fusion power from it. Detail designs such as load analyses, soundness verification tests and assembly/installation studies for the in-vessel components has been performed. The results indicated that the in-vessel component can withstand loads imposed during ITER operations and that installation and assembly scheme are clearly shown and that interface between the in-vessel components of the MFC are clearly defined.
Ishikawa, Masao; Kondoh, Takashi; Takeda, Keigo*; Itami, Kiyoshi
no journal, ,
The Microfission chamber (MFC) diagnostics measure the total neutron emission from DT plasmas, providing the evaluation of the fusion power in ITER and the MFC is procured by JAEA. At the present stage, designs, tests and analyses have been performed as preliminary design for "In-vessel Components of ITER MFC System". For Design, detail design of feed through and making installation procedure of the MFC detectors and cable connectors. Also, thermal cycle test of the signal cable and noise test of signal transmission system have been performed. Further, thermal and EM analysis for in-vessel components have been done. In this conference, details of these activities are presented.
