Development of Longitudinal-Gradient Magnet for Time Focusing of Ultra-Cold Neutron With Anisotropic Inter-Pole

Author

Arimoto, Yasushi ; Iwashita, Y. ; Yoshioka, T. ; Kitaguchi, M. ; Imajo, S. ; Shimizu, H.M. ; Asahi, K. ; Ino, T. ; Kamiya, Yushi ; Mishima, Kiyoshi ; Muto, S. ; Sakai, K. ; Shima, T. ; Taketani, K. ; Yamashita, S. ; Yoshimi, A.

Author_Institution

High Energy Accel. Res. Organ., Inst. of Mater. Struct. Sci., Tsukuba, Japan

Volume

22

Issue

3

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

4500704

Lastpage

4500704

Abstract

Ultra-cold neutron (UCN) is attractive for a search of the neutron electric dipole moment (nEDM). It is crucial to store UCNs with high density in a bottle for nEDM measurement apparatus. To increase the density, time focusing technique can be useful, where slow neutrons are accelerated and fast neutrons are decelerated by using magnetic potential. This device is called “rebuncher.” The rebuncher consists of a gradient magnet, RF coil, and neutron guide. The magnet generates a field gradient of 3.5 T/m (from 1 T to 0.2 T within 24 cm) in the longitudinal direction. By using anisotropic inter-poles, the magnet is compact and keeps the gradient uniform. The fabricated magnet showed good performance as designed.

Keywords

magnetic anisotropy; neutron electric moment; superconducting magnets; ultracold neutrons; RF coil; UCN; field gradient; longitudinal-gradient magnet; magnetic potential; nEDM measurement apparatus; neutron electric dipole moment; neutron guide; rebuncher device; ultra-cold neutron time focusing technique; Coils; Educational institutions; Magnetic moments; Neutrons; Perpendicular magnetic anisotropy; Saturation magnetization; Gradient magnet; rebuncher; time focusing; ultra-cold neutron;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2012.2183569

Filename

6156745