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Uozumi, Yusuke*; Shigyo, Nobuhiro*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Mizuno, Takafumi*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*; et al.
HIMAC-140, p.234 - 235, 2013/08
In the heavy-ion radiotherapy, considerable discussion has been attracted regarding the potential for second cancer induction by secondary neutrons produced from the primary heavy-ion fragmentation. We have started new measurements at 100 MeV/u to investigate the neutron production by heavy ions decelerating in a patient body.
Uozumi, Yusuke*; Shigyo, Nobuhiro*; Kajimoto, Tsuyoshi*; Hirabayashi, Keiichi*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; et al.
HIMAC-138, p.237 - 238, 2012/08
In the heavy-ion radiotherapy, considerable discussion has been attracted regarding the potential for second cancer induction by secondary neutrons produced from the primary heavy-ion fragmentation. It is important to measure energy-angle double-differential cross sections (DDXs) of neutron- and photon-productions in heavy-ion nuclear reactions. Since it is notoriously hard to measure the spectral cross sections of neutrons in an energy range of around 1 MeV where the RBE value reaches at its maximum. In the project by last year, experiments were carried out at the synchrotron HIMAC of NIRS, Japan. The beams were 
C and 
O of 290 MeV/u and bombarded a carbon target. In measurements of neutrons and photons were used liquid scintillator detectors of 5" and 2". We have succeeded to lower the neutron energy threshold down to 0.6 MeV. The present results for neutron productions are in reasonable agreements with PHITS. Since our goal in technical aspects has been fulfilled, measurements will be continued for other reactions.
Satoh, Daiki; Moriguchi, Daisuke*; Kajimoto, Tsuyoshi*; Uehara, Haruhiko*; Shigyo, Nobuhiro*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; Uozumi, Yusuke*; Sanami, Toshiya*; Koba, Yusuke*; et al.
Nuclear Instruments and Methods in Physics Research A, 644(1), p.59 - 67, 2011/07
Times Cited Count：18 Percentile：77.43(Instruments & Instrumentation)Neutron-production double-differential cross sections on carbon-carbon and oxygen-carbon reactions with incident heavy-ion energy of 290 MeV/nucleon were measured by time-of-flight method using liquid organic scintillators. By use of a detection system specialized for low-energy neutrons, the cross sections were obtained in a wide energy region from several hundred MeV down to 0.6 MeV for the oxygen-ion incidences. The experimental data were compared with the calculation results using the Monte-Carlo simulation code, PHITS. The PHITS results gave an overall agreement with the measured data within a factor of two.
Hayakawa, Ryoma*; Nakae, Mari*; Yoshimura, Takeshi*; Ashida, Atsushi*; Fujimura, Norifumi*; Uehara, Tsuyoshi*; Tagawa, Masahito*; Teraoka, Yuden
Journal of Applied Physics, 100(7), p.073710_1 - 073710_8, 2006/10
Times Cited Count：12 Percentile：42.56(Physics, Applied)A structural analysis and dielectric property measurements of silicon nitride films fabricated using atmospheric pressure (AP) plasma were carried out, and the results were compared to a radio frequency (RF) plasma case. Using AP plasma, 1.8-nm-thick films composed of Si
N
O
were obtained in the temperature range from 298 to 773 K. X-ray photoelectron spectroscopy and Rutherford backscattering spectrometry revealed 10% more nitrogen atoms corresponding to the NSi bond in the film using AP plasma than those using RF plasma. In the temperature range, the leakage current densities were not affected by the temperature. Films fabricated at 298 K showed leakage current density of as low as 7
10
A/cm
at 5MV/cm. This value was one order of magnitude lower than that using RF plasma.
Fujii, Toshiyuki*; Asano, Hideki*; Kimura, Takaumi; Yamamoto, Takeshi*; Uehara, Akihiro*; Yamana, Hajimu*
Journal of Alloys and Compounds, 408-412, p.989 - 994, 2006/02
Times Cited Count：10 Percentile：54.65(Chemistry, Physical)no abstracts in English
Ushigusa, Kenkichi; Ide, Shunsuke; Oikawa, Toshihiro; Suzuki, Takahiro; Kamada, Yutaka; Fujita, Takaaki; Ikeda, Yoshitaka; Naito, Osamu; Matsuoka, Mamoru*; Kondoh, Takashi; et al.
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.255 - 277, 2002/09
Times Cited Count：10 Percentile：15.15(Nuclear Science & Technology)Studies on non-inductive current drive and development of an integrated steady-state high performance operation in JT-60 are reviewed. Experiments on lower hybrid current drive in JT-60 haven shown a large non-inductive current up to 3.5MA, high current drive efficiency of 3.6x1019m-2A/W. Basic studies on LH waves in JT-60 have contributed to understand current drive physics. Significant progress in neutral beam current drive has been made in JT-60 by testing the performance of negative ion based NBI (N-NBI). The CD efficiency of ~1.5x1019m-2A /W, and N-NB driven current of ~1MA have been demonstrated in N-NBCD. Strongly localized driven current by electron cyclotron current drive was identified with a fundamental O-mode scheme. Efficiency of 0.5x1019m-2A/W and EC driven current of 0.2MA were achieved and suppression of neo-classical tearing mode was demonstrated. Based on these developments, two integrated steady-state operation scenarios were developed in JT-60, which are reversed magnetic shear (R/S) plasmas and high bp ELMy H-mode. In these operation regimes, discharges have been sustained near the steady-state current profile under full non-inductive current drive. High performance plasmas with a high nDotETio and at high normalized density were also produced under fully non-inductive condition in high bp ELMy H-mode and R/S mode.
Uehara, Kazuya; Ikeda, Yoshitaka; Saigusa, Mikio; Sakamoto, Keishi; Fujii, Tsuneyuki; Maebara, Sunao; Tsuneoka, Masaki; Seki, Masami; Moriyama, Shinichi; Kobayashi, Noriyuki*; et al.
Fusion Engineering and Design, 19(1), p.29 - 40, 1992/07
Times Cited Count：1 Percentile：17.26(Nuclear Science & Technology)no abstracts in English
Uehara, Kazuya; Nagashima, Takashi; Ikeda, Yoshitaka; Imai, Tsuyoshi; Kimura, Haruyuki; Maebara, Sunao; *; *; *; *; et al.
JAERI-M 91-182, 79 Pages, 1991/11
no abstracts in English
Imai, Tsuyoshi; Ushigusa, Kenkichi; Ikeda, Yoshitaka; Naito, Osamu; Yoshida, Hidetoshi; Seki, Masami; Itami, Kiyoshi; Nagashima, Keisuke; Uehara, Kazuya; Nagashima, Takashi
Kaku Yugo Kenkyu, 65(SPECIAL ISSUE), p.99 - 118, 1991/03
no abstracts in English
Imai, Tsuyoshi; Ushigusa, Kenkichi; Ikeda, Yoshitaka; Naito, Osamu; Yoshida, Hidetoshi; Seki, Masami; Nemoto, Masahiro; Sato, Masayasu; Koide, Yoshihiko; Uehara, Kazuya; et al.
Kaku Yugo Kenkyu, 65(SPECIAL ISSUE), p.119 - 132, 1991/03
no abstracts in English
Seki, Masami; Ikeda, Yoshitaka; *; Imai, Tsuyoshi; ; Yokokura, Kenji; Sawahata, Masayuki; Suganuma, Kazuaki; Sato, Minoru; *; et al.
Fusion Technology 1990, p.1060 - 1064, 1991/00
no abstracts in English
Imai, Tsuyoshi; Ikeda, Yoshitaka; Maebara, Sunao; Fujii, Tsuneyuki; Sakamoto, Keishi; Saigusa, Mikio; Honda, Masao; Yokokura, Kenji; Sawahata, Masayuki; Uehara, Kazuya; et al.
Fusion Engineering and Design, 13, p.177 - 185, 1990/00
Times Cited Count：2 Percentile：31.34(Nuclear Science & Technology)no abstracts in English
Ikeda, Yoshitaka; Imai, Tsuyoshi; Fujii, Tsuneyuki; Honda, Masao; ; Maebara, Sunao; Nagashima, Takashi; Saigusa, Mikio; Sakamoto, Keishi; Sawahata, Masayuki; et al.
Fusion Engineering and Design, 13, p.209 - 217, 1990/00
Times Cited Count：1 Percentile：19.6(Nuclear Science & Technology)no abstracts in English
Ikeda, Yoshitaka; Imai, Tsuyoshi; Ushigusa, Kenkichi; Seki, Masami; *; Naito, Osamu; Honda, Masao; ; Maebara, Sunao; Nagashima, Takashi; et al.
Nuclear Fusion, 29(10), p.1815 - 1819, 1989/10
Times Cited Count：24 Percentile：70.1(Physics, Fluids & Plasmas)no abstracts in English
Ushigusa, Kenkichi; Imai, Tsuyoshi; Ikeda, Yoshitaka; Naito, Osamu; Uehara, Kazuya; Yoshida, Hidetoshi; Kubo, Hirotaka; JT-60 Team
Nuclear Fusion, 29(6), p.1052 - 1055, 1989/06
Times Cited Count：36 Percentile：81.44(Physics, Fluids & Plasmas)no abstracts in English
Ushigusa, Kenkichi; Imai, Tsuyoshi; Ikeda, Yoshitaka; Sakamoto, Keishi; F.X.Soeldner*; *; Tsuji, Shunji; Shimizu, Katsuhiro; Naito, Osamu; Uehara, Kazuya; et al.
Nuclear Fusion, 29(2), p.265 - 276, 1989/02
Times Cited Count：17 Percentile：58.82(Physics, Fluids & Plasmas)no abstracts in English
*; Ikeda, Yoshitaka; Seki, Masami; Imai, Tsuyoshi; Honda, Masao; Yokokura, Kenji; Sawahata, Masayuki; Sato, Minoru; Suganuma, Kazuaki; Ushigusa, Kenkichi; et al.
Proc. of the IEEE 13th on Fusion Engineering,Vol. 1, p.207 - 210, 1989/00
no abstracts in English
Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi; *; Nagashima, Takashi; Uehara, Kazuya
Radio-Frequency Power in Plasmas, p.170 - 173, 1989/00
no abstracts in English
Ikeda, Yoshitaka; Honda, Masao; Yokokura, Kenji; Tsuneoka, Masaki; Seki, Masami; Maebara, Sunao; Sawahata, Masayuki; Sato, Minoru; *; Imai, Tsuyoshi; et al.
JAERI-M 88-182, 48 Pages, 1988/10
no abstracts in English
Ushigusa, Kenkichi; Imai, Tsuyoshi; Ikeda, Yoshitaka; Sakamoto, Keishi; F.X.Soldner*; *; Tsuji, Shunji; Shimizu, Katsuhiro; Naito, Osamu; Uehara, Kazuya; et al.
JAERI-M 88-115, 28 Pages, 1988/06
no abstracts in English
