Author: Arimoto, Y.
Paper Title Page
TUPEA012 Rebunching Ultracold Neutrons by Magnetic Deceleration for the neutron EDM experiment at J-PARC 1187
 
  • S. Imajo
    Kyoto University, Kyoto, Japan
  • Y. Arimoto
    KEK, Ibaraki, Japan
  • P.W. Geltenbort
    ILL, Grenoble, France
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • M. Kitaguchi
    Kyoto University, Research Reactor Institute, Osaka, Japan
  • Y. Seki
    RIKEN Nishina Center, Wako, Japan
  • H.M. Shimizu
    Nagoya University, Nagoya, Japan
  • T. Yoshioka
    Kyushu University, Fukuoka, Japan
 
  Ultra cold neu­trons (UCN) - neu­trons with en­er­gies less than 300 neV - can be ac­cel­er­ated or de­cel­er­ated by means of sta­tic mag­netic and RF fields. Neu­tron have a mag­netic di­pole mo­ment, and hence their ki­netic en­er­gies vary de­pend­ing on their spin in mag­netic fields. Their ki­netic en­er­gies are re­stored when they get out from the mag­netic field area if their spin did not flip. A spin flip can be trig­gered by ap­ply­ing an RF field whose fre­quency co­in­cides with the spin pre­ces­sion fre­quency of a neu­tron in this mag­netic field. This al­lows to tune the ki­netic en­ergy of neu­trons. This method can be used to re­bunch a pulsed beam of neu­trons to a stor­age bot­tle that can store UCN. By open and close the stor­age bot­tle syn­chro­nously with the re­buncher, high UCN den­si­ties can be achieved for pre­ci­sion mea­sure­ments of neu­tron prop­er­ties such as the Elec­tric Di­pole Mo­ment. The method and ex­per­i­men­tal setup are de­scribed in de­tail and the re­sults of a re­cent first test ex­per­i­ments are pre­sented.