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Oku, Takayuki; Suzuki, Junichi; Sasao, Hajime*; Yamada, Satoru; Furusaka, Michihiro*; Adachi, Tomohiro*; Shinohara, Takenao*; Ikeda, Kazuaki*; Shimizu, Hirohiko
Physica B; Condensed Matter, 356(1-4), p.126 - 130, 2005/02
Times Cited Count：11 Percentile：45.41(Physics, Condensed Matter)We have developed a magnetic neutron lens (MNL) based on a sextupole magnet. A neutron beam, which is incident to the sextupole magnet, either converges or diverges depending on the neutron spin state. Small-angle neutron scattering in focusing geometry (FSANS) was proposed to improve the q-resolution and/or measuring efficiency. The MNL is considered to be the most suitable focusing device for FSANS experiments using a polarized neutron beam, since it focuses the polarized neutron beam free from neutron attenuation and scattering by substances. Recently, we have developed the MNLs with sufficiently large apertures and strong focusing power for FSANS experiments. In this study, we evaluate the focusing property of the MNLs for the polarized neutron beam, and performed FSANS experiments using the MNL. The obtained results are discussed.
Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Leli
vre-Berna, E.*; Tasset, F.*; Regnault, L.-P.*
Physica B; Condensed Matter, 356(1-4), p.136 - 140, 2005/02
Times Cited Count：17 Percentile：57.33(Physics, Condensed Matter)It is now well known that CRYOPAD (CRYOgenic Polarization Analysis Device) is a powerful device which enables us to investigate the spherical changes of neutron-spin polarization in the scattering processes of magnetic materials. ILL and CEA-Grenoble, in the framework of EC/ENPI, and JAERI, in the framework of the MoU between ILL and ASRC JAERI, initiated to assemble three third generation CRYOPADs at ILL (CRYOPADUM project), optimized both for elastic and inelastic neutron scattering. One is installed on the ILL instrument D3 (Millennium Project) and the other on the CEA-Grenoble instrument IN22. The JAERI CRYOPADUM is installed on the triple-axis spectrometer TAS-1 at JRR-3 and is now in commissioning with powerful data acquisition software implanted from D3. We present the status of the CRYOPADUM on TAS-1 at JAERI and describe some of the planned experiments.
Yamazaki, Dai; Soyama, Kazuhiko; Ebisawa, Toru*; Takeda, Masayasu; Maruyama, Ryuji*; Tasaki, Seiji*
Physica B; Condensed Matter, 356(1-4), p.174 - 177, 2005/02
Times Cited Count：1 Percentile：6.21(Physics, Condensed Matter)Drabkin energy filter could be used as a fast chopper for pulsed neutrons by varying the resonant wavelength 
fast in such a way that resonant wavelength matches neutron wavelength at a small time region. The faster are varied, the smaller time window we could obtain. Neutron pulses could be sharpened much more effectively for a small wavelength band than in the wide-band pulse-shaping mode in which is varied in synchronization with the time-of-flight from the moderator. In our preliminary test of a chopper-mode with a prototype Drabkin energy filter, time-window of 0.21 ms was obtained while it was 1.08 ms with the filter driven stationary. Narrower time-window could have been obtained if we had more beam-time and it could be also narrowed with higher-resolution Drabkin filters.
Yamazaki, Dai; Soyama, Kazuhiko; Ebisawa, Toru*; Takeda, Masayasu; Torikai, Naoya*; Tasaki, Seiji*; Matsuoka, Hideki*
Physica B; Condensed Matter, 356(1-4), p.229 - 233, 2005/02
Times Cited Count：1 Percentile：6.21(Physics, Condensed Matter)The application of neutron reflectometry to study dynamic phenomena at surface and interfaces have been restricted so far. It was mainly due to the low intensity of neutron sources, but now high-intensity spallation neutron sources are under construction in Japan (J-PARC) and U.S. (SNS). We have a plan to install a spin-echo option on the J-PARC neutron reflectometer with horizontal sample geometry for studies on dynamics of surfaces and interfaces. This option is based on the resonance spin-echo method and aimed at dynamics upto hundreds of nanoseconds. In this contribution, the plan and status of development are introduced together with the principle and characteristics of this option.
