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Takahashi, Nobuaki; Shibata, Kaoru*; Yamada, Takeshi*; Kamazawa, Kazuya*; Kawakita, Yukinobu; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; Nakatani, Takeshi; Aizawa, Kazuya; et al.
no journal, ,
A Si crystal analyzer near backscattering spectrometer DNA which covers the area of the micro-eV energy range in the Q-E space, where it is expected to explore sciences on atomic, molecular and spin dynamics in the nanosecond time range has been installed at BL02 of the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC) until at the end of February 2012. Then, various on-beam commissioning has been done for about a year with handling continuing user program. In this report, we will introduce specifications, current status of the instrument.
Kubota, Masato; Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Oikawa, Kenichi; Yamazaki, Tatsuya*; Aizawa, Kazuya; et al.
no journal, ,
Suzuki, Hiroshi; Wakimoto, Shuichi; Matsue, Hideaki; Shibayama, Mitsuhiro*; Kakurai, Kazuhisa
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Instruments in JRR-3 have been continuously upgraded, and produced many interesting results in research fields of materials and life science. JRR-3 has been unfortunately out of service for a long time due to the earthquake occurred on March 11th, 2011. The damage of instruments in the JRR-3 due to the earthquake was not so serious, so fortunately they have already been recovered from the disaster. However, lost alignment in neutron guide tubes estimates about 85% neutron flux of before the disaster even after the realignment. Meanwhile, we have undertaken not only recovery but also improvement, e.g., replacing the cold neutron guides with the supermirror guide tube for increasing their neutron flux. On the other hand, the JRR-3 Users Office was started in Apr., 2010 to provide user supports for 18 instruments owned by JAEA. They have recently worked to improve the user-interface like establishments of the JRR-3 publication database and the new proposal application system, RING. Furthermore, they have dedicated their efforts to internationalization for accepting international users in near future. In this presentation, we will introduce current status of JRR-3 after the earthquake including present user support system as well as some research topics especially in neutron engineering diffraction.
Nakatani, Takeshi; Inamura, Yasuhiro; Ito, Takayoshi*
no journal, ,
We have introduced the universal signal event recording board which we call "TrigNET" into our DAQ system. The TrigNET can output the event data which consist of the elapsed time from the trigger which indicate a neutron production, the event source and the signal values. We have incorporated the TrigNET with the several instruments and measured the neutron optics device signal, which are the rotating pulse of the choppers, the phase of the neutron polarizer and so on, and the external fields of the sample environment devices which are temperature, electric, magnetic, laser and so on. All of the event data output from these boards are collected by DAQ-Middleware, which is the standard DAQ software in J-PARC/MLF. By using this DAQ system, we can analyze all event date with the single clock. And then, we will be able to multidimensionally analyze time-transient measurements combined the several conditions of the sample environment or the neutron optics.
Segawa, Mariko; Shinohara, Takenao; Kai, Tetsuya; Iikura, Hiroshi; Oi, Motoki; Oikawa, Kenichi; Harada, Masahide; Sakai, Kenji; Soyama, Kazuhiko; Aizawa, Kazuya; et al.
no journal, ,
Abe, Jun; Harjo, S.; Gong, W.; Iwahashi, Takaaki; Aizawa, Kazuya
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The engineering materials diffractometer "TAKUMI" which is dedicated to investigate the stress-straing state was constructed at BL19 in J-PARC/MLF. Current status and activity of TAKUMI will be reported.
Kikuchi, Tatsuya; Nakajima, Kenji; Kawamura, Seiko; Inamura, Yasuhiro
no journal, ,
Dynamic structure factor, 
, which can be obtained by neutron scatterings is defined as a Fourier-transformed function from van Hove's space-time correlation function, 
, which is a function in real space and time. is important for elucidation of relaxation phenomena to express the motion of atoms and molecules directly. However, the calculation of has been hardly performed even though it is so easy mathematically, because it was difficult to measure both in high resolution and wide Q-E range. By the progress of the recent neutron sources and spectrometers, the measurements with wide range and high resolution in Q-E space are becoming easy. We measured high-resolution using AMATERAS spectrometer installed at J-PARC and calculated 's. We chose benzene and benzene-d6 as the samples, which were simple molecular liquids. We used the maximum entropy method to lower the bias of truncation errors for the calculation of .