TY - JOUR
T1 - Longitudinal-gradient magnet for time focusing of ultra-cold neutrons
AU - Arimoto, Y.
AU - Yoshioka, T.
AU - M. Shimizu, H.
AU - Mishima, K.
AU - Ino, T.
AU - Taketani, K.
AU - Muto, S.
AU - Kitaguchi, M.
AU - Imajo, S.
AU - Iwashita, Y.
AU - Yamashita, S.
AU - Kamiya, Y.
AU - Yoshimi, A.
AU - Asahi, K.
AU - Shima, T.
AU - Sakai, K.
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Creative Scientific Research of the Ministry of Education of Japanese Government under Program No. 19GS0210 and the Quantum Beam Fundamentals Development Program, MEXT.
PY - 2011
Y1 - 2011
N2 - A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B0 magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm≤ y ≤ 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B0 magnet is capable of accepting UCNs in the velocity range 2.3∼3.3 m/s.
AB - A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B0 magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm≤ y ≤ 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B0 magnet is capable of accepting UCNs in the velocity range 2.3∼3.3 m/s.
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U2 - 10.1016/j.phpro.2011.06.013
DO - 10.1016/j.phpro.2011.06.013
M3 - Conference article
AN - SCOPUS:84856824454
VL - 17
SP - 20
EP - 29
JO - Physics Procedia
JF - Physics Procedia
SN - 1875-3892
T2 - 2nd International Workshop on the Physics of Fundamental Symmetries and Interactions, PSI 2010
Y2 - 11 October 2010 through 14 October 2010
ER -