Design of a neutron polarizer using polarizing super mirrors for the TOF-SANS instrument at the J-PARC
✍ Scribed by Takenao Shinohara; Jun-ichi Suzuki; Takayuki Oku; Shin-ichi Takata; Hiroshi Kira; Kentaro Suzuya; Kazuya Aizawa; Masatoshi Arai; Toshiya Otomo; Masaaki Sugiyama
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 221 KB
- Volume
- 404
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
Small-angle neutron scattering technique using polarized neutrons is powerful for studying structures in the range between nm and mm of magnetic materials. In addition, they have been used for the incident beam of focusing-geometry SANS instruments using a magnetic neutron lens, where a high polarization degree of about 99.9% is necessary because the imperfectness of the neutron polarization increases the background level. We are going to install such a magnetic focusing system on the new time-of-flight SANS (TOF-SANS) instrument at the J-PARC so as to make q min smaller than 10 À3 A ˚À1 and improve the resolution of the conventional TOF-SANS at low q. As a polarizing device of the instrument, two V-shaped polarizing super mirrors arranged in crossed geometry to enhance the polarization degree has been considered. In this paper, we present the concept and the detailed design of this device and its performance estimated by Monte Carlo simulations.