A magnetic neutron lens based on an extended Halbach-type permanent sextupole magnet

✍ Scribed by Takayuki Oku; Satoru Yamada; Hajime Sasao; Jun-ichi Suzuki; Takenao Shinohara; Katsuya Hirota; Kazuaki Ikeda; Tsuyosi Tsuzaki; Yoshiaki Kiyanagi; Michihiro Furusaka; Hirohiko M. Shimizu

• Book ID: 103886619
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 310 KB
• Volume: 385-386
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.05.416

✦ Synopsis

We have developed a magnetic neutron lens (MNL) based on an extended Halbach-type permanent sextupole magnet. The effective aperture size is 30 mm in diameter and the length is 2400 mm. The sextupole magnetic field distribution |B| ¼ (G/2) r 2 with the gradient coefficient G ¼ 10,6607530 T/m 2 are generated inside the magnet, where r is the distance from the magnet center axis. The neutronfocusing property is investigated by using pulsed polarized neutrons. The obtained results are discussed in comparison with numerical simulation results. The application to the focusing-geometry small-angle neutron scattering experiments is discussed.