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Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Kaneko, Koji; Kawasaki, Takuro; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; et al.
Journal of Applied Crystallography, 49(1), p.120 - 127, 2016/02
Times Cited Count：59 Percentile：96.09(Chemistry, Multidisciplinary)
X-ray diffractionShimomura, Kenichi*; Suzuki, Hidetoshi*; Sasaki, Takuo; Takahashi, Masamitsu; Oshita, Yoshio*; Kamiya, Itaru*
Journal of Applied Physics, 118(18), p.185303_1 - 185303_7, 2015/11
Times Cited Count：9 Percentile：35.70(Physics, Applied)Oikawa, Kenichi; Kawasaki, Takuro; Ohara, Takashi; Kiyanagi, Ryoji; Kaneko, Koji; Tamura, Itaru; Nakamura, Tatsuya; Harada, Masahide; Nakao, Akiko*; Hanashima, Takayasu*; et al.
JPS Conference Proceedings (Internet), 1, p.014013_1 - 014013_5, 2014/03
A new single crystal time-of-flight neutron diffractometer has been installed at BL18 of the Materials and Life Science Experimental Facility of J-PARC. The diffractometer "SENJU" was designed for precise crystal and magnetic structure analyses using a small crystal less than 1.0 mm
under multiple extreme environments such as low-temperature and high-magnetic field. The first neutron beam was delivered to the sample position on March 5, 2012. Subsequently, the hardware and software of SENJU have been checked and confirmed that they worked fine. At the same time, diffraction experiments of several organic and inorganic crystals have been done using NaCl, C12A7, and so on. In these measurements, Bragg reflections in the high-Q region (d-spacing 
0.5 
) were clearly observed and analyzed successfully. In this presentation, we will show the instrument design and performance evaluation of SENJU in detail.
Sasaki, Takuo*; Shimomura, Kenichi*; Suzuki, Hidetoshi*; Takahashi, Masamitsu; Kamiya, Itaru*; Oshita, Yoshio*; Yamaguchi, Masafumi*
Japanese Journal of Applied Physics, 51(2), p.02BP01_1 - 02BP01_3, 2012/02
Times Cited Count：2 Percentile：8.51(Physics, Applied)Tamura, Itaru; Oikawa, Kenichi; Kawasaki, Takuro; Ohara, Takashi; Kaneko, Koji; Kiyanagi, Ryoji; Kimura, Hiroyuki*; Takahashi, Miwako; Kiyotani, Tamiko*; Arai, Masatoshi; et al.
Journal of Physics; Conference Series, 340, p.012040_1 - 012040_4, 2012/02
Times Cited Count：11 Percentile：94.00(Physics, Condensed Matter)Sasaki, Takuo*; Suzuki, Hidetoshi*; Inagaki, Makoto*; Ikeda, Kazuma*; Shimomura, Kenichi*; Takahashi, Masamitsu; Kozu, Miwa*; Hu, W.; Kamiya, Itaru*; Oshita, Yoshio*; et al.
IEEE Journal of Photovoltaics, 2(1), p.35 - 40, 2012/01
Times Cited Count：5 Percentile：21.66(Energy & Fuels)Sasaki, Takuo*; Suzuki, Hidetoshi*; Takahashi, Masamitsu; Oshita, Yoshio*; Kamiya, Itaru*; Yamaguchi, Masafumi*
Journal of Applied Physics, 110(11), p.113502_1 - 113502_7, 2011/12
Times Cited Count：12 Percentile：45.42(Physics, Applied)
at the MLF, J-PARCTakahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Sato, Taku*; Tsukushi, Itaru*; et al.
Journal of the Physical Society of Japan, 80(Suppl.B), p.SB007_1 - SB007_4, 2011/12
Times Cited Count：7 Percentile：46.10(Physics, Multidisciplinary)Sasaki, Takuo*; Suzuki, Hidetoshi*; Sai, Akihisa*; Takahashi, Masamitsu; Fujikawa, Seiji; Kamiya, Itaru*; Oshita, Yoshio*; Yamaguchi, Masafumi*
Journal of Crystal Growth, 323(1), p.13 - 16, 2011/05
Times Cited Count：20 Percentile：82.37(Crystallography)Growth temperature dependence of strain relaxation during In![$$_{0.12}]$$](/search/images/ERPXWMBOGEZH0XJE.gif)
Ga
As/GaAs(001) molecular beam epitaxy was studied by in situ X-ray reciprocal space mapping. Evolution of the residual strain and crystal quality for the InGaAs film was obtained as a function of film thickness at growth temperatures of 420, 445 and 477 
C. In the early stages of strain relaxation, it was found that evolution of the residual strain and crystal quality was dependent on the growth temperature. In order to discuss this observation quantitatively, the strain relaxation model was proposed based on the Dodson-Tsao kinetic model, and its validity was demonstrated by good agreement with the experimental residual strain. Additionally, rate coefficients reflecting dislocation motions during strain relaxation were obtained as a function of growth temperature and strain relaxation was discussed in terms of the thermally active dislocation motion.
Suzuki, Hidetoshi*; Sasaki, Takuo*; Sai, Akihisa*; Oshita, Yoshio*; Kamiya, Itaru*; Yamaguchi, Masafumi*; Takahashi, Masamitsu; Fujikawa, Seiji
Applied Physics Letters, 97(4), p.041906_1 - 041906_3, 2010/07
Times Cited Count：32 Percentile：73.91(Physics, Applied)
real-time X-Ray reciprocal space mapping during InGaAs/GaAs growth for understanding strain relaxation mechanismsSasaki, Takuo*; Suzuki, Hidetoshi*; Sai, Akihisa*; Lee, J.-H.*; Takahashi, Masamitsu; Fujikawa, Seiji; Arafune, Koji*; Kamiya, Itaru*; Oshita, Yoshio*; Yamaguchi, Masafumi*
Applied Physics Express, 2, p.085501_1 - 085501_3, 2009/07
Times Cited Count：35 Percentile：75.70(Physics, Applied)Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*; Metoki, Naoto; Nakajima, Kenji; Arai, Masatoshi
Nuclear Instruments and Methods in Physics Research A, 600(1), p.91 - 93, 2009/02
Times Cited Count：8 Percentile：49.59(Instruments & Instrumentation)A time-of-flight crystal-analyzer neutron inelastic scattering spectrometer DNA has been proposed to construct in the MLF of J-PARC. DNA has been designed to have three crystal analyzers, PG(002), Ge(311) and Si(111) at near-backscattering configurations to study dynamics of biomolecules and proteins in wide energy and momentum transfer ranges. In order to develop the Ge(311) analyzer-crystals we have performed neutron beam experiments to check rocking curves on two candidates, i.e., (a) thick hot-pressed wafers and (b) stacked number of thin as-cut wafers, at the MUSASI port, which is a triple-axis instrument, located on the T2 beam line at the JRR-3M guide hall, Tokai, Japan.
Shibata, Kaoru; Takahashi, Nobuaki; Nakagawa, Hiroshi; Fujiwara, Satoru; Kataoka, Mikio; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*
Nihon Kessho Gakkai-Shi, 50(1), p.46 - 50, 2008/02
The instrumental design of an indirect geometry crystal analyzer spectrometer: DNA which is scheduled to be constructed in the Material and Life Science experimental Facility (MLF) at J-PARC, is reported in this article. This spectrometer is mainly aimed at searching for the high quality inelastic scattering spectra with only several mg order biomolecular sample in the plenty of wide range of energy and momentum transfers.
Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Tamura, Itaru; Kajimoto, Ryoichi; Harjo, S.; Oikawa, Kenichi; Arai, Masatoshi; Mezei, F.*
Journal of Physics and Chemistry of Solids, 68(11), p.2199 - 2203, 2007/11
Times Cited Count：7 Percentile：34.22(Chemistry, Multidisciplinary)A near-backscattering crystal-analyzer neutron inelastic spectrometer, DIANA has been proposed to construct at Materials and Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). It has firstly been designed to see a decoupled non-poisoned moderator in order to obtain higher intensity and better energy resolution. In deed, the decoupled moderator has a narrower pulse width than a coupled moderator, and so it will give us a better energy resolution. However, the peak neutron flux of the decoupled moderator has only a half of the coupled moderator. In order to decide the best choice of this type of near-backscattering instruments, we have reconsidered instrumental parameters including the type of moderators. We have performed Monte-Carlo neutron ray-tracing simulations, using McStas and have compared these results in various viewpoints such as intensities, resolutions, shape of resolution functions, scan ranges and so on.
Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*
no journal, ,
no abstracts in English
Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi
no journal, ,
In the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC, we are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF.
Shibata, Kaoru; Takahashi, Nobuaki; Nakajima, Kenji; Kambara, Wataru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.
no journal, ,
no abstracts in English
Shibata, Kaoru; Takahashi, Nobuaki; Tsukushi, Itaru*; Kawakita, Yukinobu*; Sato, Taku*; Nakajima, Kenji; Arai, Masatoshi
no journal, ,
We will report the experimental results of thermal diffuse scattering (TDS) which occurs close to the Bragg reflections in time-of-flight neutron diffraction. We measured the thermal diffuse scatterings around some analyzer crystals Bragg peaks; pyrolitic graphite PG(002), perfect silicon Si(111) and natural green mica: Mica(006).
Shibata, Kaoru; Takahashi, Nobuaki; Tsukushi, Itaru*; Nakajima, Kenji; Arai, Masatoshi
no journal, ,
In this presentation, we will report the experimental results of thermal diffuse scattering (TDS) which occurs close to the Bragg reflections in time-of-flight neutron diffraction. We measured the thermal diffuse scatterings around some analyzer crystals Bragg peaks; pyrolitic graphite PG(002), perfect silicon Si(111) and natural green mica: Mica(006). Those experiments were performed on the diffraction counter bank of LAM-80ET: the indirect geometry crystal analyzer spectrometer installed at KENS; the pulsed neutron source in KEK, Japan, using scattering angles around 2th 160. deg.
Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.
no journal, ,
no abstracts in English
