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Shinohara, Koji; Takechi, Manabu; Ishikawa, Masao; Kusama, Yoshinori; Tsuzuki, Kazuhiro; Urata, Kazuhiro*; Kawashima, Hisato; Tobita, Kenji; Fukuyama, Atsushi*; Cheng, C. Z.*; et al.
Plasma Physics and Controlled Fusion, 46(7), p.S31 - S45, 2004/07
Times Cited Count：42 Percentile：77.83(Physics, Fluids & Plasmas)Recent energetic particle physics research has been devoted to Alfven eigenmodes (AEs) in reversed-shear (RS) plasmas, energetic ion transport in the appearance of modes in the frequency range of TAE, energetic ion behavior in the plasma with a current hole, and ripple loss in the complex toroidal field ripple due to ferritic steel plates. We will report these recent progresses for energetic particle physics in JT-60U and JFT-2M.
Yamagishi, Hideshi; Suzuki, Katsuo; Kakuta, Tsunemi; ; *; *
JAERI-Research 99-002, 18 Pages, 1999/01
JAERI-Research-99-002.pdf:1.16MB
no abstracts in English
Harada, Masahide; Teshigawara, Makoto; Oi, Motoki; Oikawa, Kenichi; Ikeda, Yujiro
no journal, ,
In a spallation neutron source at Materials and Life Science Facility in J-PARC, 3GeV 1MW proton beam hits a mercury target and produced neutron beam provide to neutron instruments. Not only thermal and cold neutrons, but also high energy neutrons provide to the neutron instruments. The high energy neutrons about 1 MeV are available for a high energy neutron irradiation experiment. Because the high energy neutrons to provide the neutron instruments have been estimated by a simulation code, a validation of the high energy neutrons is necessary. In addition, neutron intensity and distribution at a sample position should be brought out as an irradiation field. Therefore, in NOBORU (BL10), high neutron intensity and distribution were measured with the foil activation method of Au, Al, Bi, In and Nb using threshold reactions in case with and without a thermal neutron filter. And the neutron distribution of the high energy neutrons was measured with an Al foil. The validation with the PHITS code indicates good agreement.
Harada, Masahide; Yamaguchi, Yuji; Kawamura, Seiko; Kofu, Maiko; Nirei, Masami; Haga, Katsuhiro; Oku, Takayuki; Matsuura, Masato*; Kusaka, Katsuhiro*; Nakayama, Haruki*
no journal, ,
In the Materials and Life science experimental Facility (MLF) at J-PARC, 3 GeV proton beam is injected into a mercury target to provide neutrons produced by spallation reactions to neutron instruments, and as of June 2023, MLF is operating at 800 kW proton beam output. The intensity of neutrons provided to the neutron instruments is an important factor to characterize the performance of the neutron instruments. So far, neutron intensity measurements have been done with He-3 counters and gold foil activation methods. To measure both spatial distribution and absolute value simultaneously with high accuracy was an issue. To solve this issue, we proposed the large-area gold-foil activation method for thermal neutrons. In this presentation, we will explain the method of the large-area gold foil activation method and report examples of its application to neutron intensity and distribution measurements at BL02, BL03, and BL14.
