LINAC2014 - List of Authors (Kitahara, R.)

Paper	Title	Page
THPP092	Development of Slow Neutron Accelerator for Rebunching Pulsed Neutrons	1062
SUPG019	use link to see paper's listing under its alternate paper code
	S. Imajo Kyoto University, Kyoto, Japan Y. Fuwa, Y. Iwashita, R. Kitahara Kyoto ICR, Uji, Kyoto, Japan T. Ino KEK, Ibaraki, Japan M. Kitaguchi, H.M. Shimizu Nagoya University, Nagoya, Japan K. Mishima ICEPP, Tokyo, Japan
	Low energy neutrons can be accelerated or decelerated by the technique of AFP-NMR with RF and gradient magnetic fields. The neutrons have magnetic moments, hence their potential energy are not cancelled before and after passage of magnetic fields and their kinetic energy change finally when their spins are flipped in the fields. Nowadays most measurements of the neutron electric dipole moment (nEDM) are carried out with ultra cold neutrons (UCN), whose kinetic energies are lower than about 300 neV, and with a small storage bottle to reduce the systematic errors. In such experiments highly dense UCNs are desired. The spallation neutron sources generate high-density neutrons, however, the pulsed neutrons with several velocities are diffused in guide tubes under long beam intervals. It is necessary to focus and rebunch UCN temporally upon the bottle by controlling their velocities in nEDM experiments at those facilities. We demonstrated such rebuncher and have been developed the advanced apparatus which makes it possible to handle broader energy range UCN. The design, measured characteristics, the experimental setup and the obtained results at J-PARC will be described.

Paper

Title

Page

THPP092

Development of Slow Neutron Accelerator for Rebunching Pulsed Neutrons

1062

SUPG019

use link to see paper's listing under its alternate paper code

S. Imajo
Kyoto University, Kyoto, Japan
Y. Fuwa, Y. Iwashita, R. Kitahara
Kyoto ICR, Uji, Kyoto, Japan
T. Ino
KEK, Ibaraki, Japan
M. Kitaguchi, H.M. Shimizu
Nagoya University, Nagoya, Japan
K. Mishima
ICEPP, Tokyo, Japan

Low energy neutrons can be accelerated or decelerated by the technique of AFP-NMR with RF and gradient magnetic fields. The neutrons have magnetic moments, hence their potential energy are not cancelled before and after passage of magnetic fields and their kinetic energy change finally when their spins are flipped in the fields. Nowadays most measurements of the neutron electric dipole moment (nEDM) are carried out with ultra cold neutrons (UCN), whose kinetic energies are lower than about 300 neV, and with a small storage bottle to reduce the systematic errors. In such experiments highly dense UCNs are desired. The spallation neutron sources generate high-density neutrons, however, the pulsed neutrons with several velocities are diffused in guide tubes under long beam intervals. It is necessary to focus and rebunch UCN temporally upon the bottle by controlling their velocities in nEDM experiments at those facilities. We demonstrated such rebuncher and have been developed the advanced apparatus which makes it possible to handle broader energy range UCN. The design, measured characteristics, the experimental setup and the obtained results at J-PARC will be described.