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梶本 亮一; 佐藤 研太朗*; 稲村 泰弘; 藤田 全基*
AIP Conference Proceedings 1969, p.050004_1 - 050004_8, 2018/05
被引用回数：6 パーセンタイル：93.77(Physics, Applied)We performed simulations of the resolution function of the 4SEASONS spectrometer at J-PARC by using the Monte Carlo simulation package McStas. The simulations showed reasonably good agreement with analytical calculations of energy and momentum resolutions by using a simplified description. We implemented new functionalities in Utsusemi, the standard data analysis tool used in 4SEASONS, to enable visualization of the simulated resolution function and predict its shape for specific experimental configurations.
梶本 亮一; 中村 充孝; 稲村 泰弘; 蒲沢 和也*; 池内 和彦*; 飯田 一樹*; 石角 元志*
no journal, ,
4SEASONS (SIKI) is one of the four chopper spectrometers in MLF at J-PARC. It covers middle energy and momentum regions (10
- 10
meV and 10 - 10
) among the inelastic scattering instruments in MLF. The instrument is used for studies of magnetic and lattice dynamics in superconductors, magnetic materials, dielectrics, catalysts, thermoelectric materials, etc. On the other hand, the upgrading work of the spectrometer is continued, which includes installation of a new Fermi chopper, development of a radial collimator, increase number of the detectors, replacement of the instrument control system, and a further study of background. In the presentation, we show the recent improvements of the instrument as well as examples of scientific outputs.
梶本 亮一; 中村 充孝; 柴田 薫; 山田 武*; 遠藤 仁*; 伊藤 晋一*; 横尾 哲也*; 中島 健次; 河村 聖子; 川北 至信; et al.
no journal, ,
MLF has 6 inelastic neutron scattering and quasi-elastic neutron scattering instruments in MLF. 4SEASONS and HRC are Fermi chopper type direct geometry spectrometers, and AMATERAS is one of a disk chopper type. POLANO is a chopper spectrometer capable to use polarized neutron. DNA is a near-back scattering spectrometer with a pulse-shaping chopper, and available to measure at 
eV resolution. Neutron spin echo spectrometer VIN ROSE includes 2 instruments, MIEZE type and NRSE type. With these instruments, MLF gives opportunities to perform experiments in widely spread fields including solid state physics, amorphous materials and liquids, soft and biological matters, as well as industrial applications such as tire rubbers and battery materials. In this presentation, we review the characteristic features of these 6 instruments and scientific opportunities realized by the instruments.
川北 至信; 菊地 龍弥; 稲村 泰弘
no journal, ,
J-PARCセンター物質・生命科学実験施設(MLF)の中性子散乱実験におけるデータ解析技術の進展として、試料環境情報とデータ取得をリンクさせることにより実現したストロボスコピックな回折測定の例、準弾性散乱データの解析技術としてMLFで開発されたモード分布解析の最近の発展、エネルギー移動-逆空間で計測される動的構造因子を実時間・実空間に変換する手法とそれを用いた構造的乱れが機能発現の鍵となっている機能物質の解析例などを紹介する。
菊地 龍弥; 中島 健次; 河村 聖子; 川北 至信; 稲村 泰弘; 沢辺 正樹; 若井 大介*
no journal, ,
We are operating a cold-neutron disk-chopper spectrometer AMATERAS installed at MLF, J-PARC and carrying out many experiments so far. The reduction of background is one of the important issues in operating the spectrometers. At AMATERAS, we have already spent anomalous effort to reduce the background. As a result the current level of background of AMATERAS is 13 counts per an hour and a meter of a PSD-detector, and we are still continuing our work to realize further reduction of the background. Now we focused on several issues. For example, the 
-ray background is caused by the prompt -ray that occurred by the sample itself and the cadmium metal for background reduction. On AMAERAS 
He detectors which are low sensitivity of -ray are used, but nonetheless the -ray becomes an obstacle of the measurements. The time-independent background is thought that it is caused by the environmental neutrons. This background is time independent. It is constant regardless of the operation of the proton accelerator and ON/OFF of the neutron beam.
