Development of a magnetic imaging technique using pulsed polarized neutrons at J-PARC MLF

Hiroi, Kosuke  ; Shinohara, Takenao   ; Hayashida, Hirotoshi*; Parker, J. D.*; Oikawa, Kenichi   ; Su, Y. H.  ; Kai, Tetsuya   ; Kiyanagi, Yoshiaki*

We have been developing a magnetic imaging technique using pulsed polarized neutrons at the Materials and Life Science Experimental Facility (MLF) of J-PARC. To apply this method to the direct observation of the magnetic field of an operating industrial product, e.g. electric motors, electric transformers, etc., we constructed the polarization analysis system for neutron imaging and performed some application studies at BL10 NOBORU and BL22 RADEN. In this presentation, we will describe the present status of our polarized neutron imaging method and show some experimental results, including the imaging of the magnetic field of a rotating electric motor, visualization of the leaked magnetic field from a small electric transformer and observation of the magnetic domains in a grain-oriented electric steel.