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Report No.
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Development of AC magnetic field imaging technique using polarized pulsed neutrons

Hiroi, Kosuke  ; Shinohara, Takenao   ; Hayashida, Hirotoshi*; Oikawa, Kenichi   ; Harada, Masahide   ; Kai, Tetsuya   ; Arai, Masatoshi

We have been developing a quantitative magnetic field imaging technique at J-PARC. Applying this method to observation of a magnetic field in industrial products, it is necessary to extend this technique to an AC magnetic field driving at a frequency of commercial power supply. In this study, we tried to visualize an AC magnetic field quantitatively. The AC magnetic field was produced by applying an AC electric current to a small solenoid coil. By recording a start time of the AC field, we calculated a phase of the field in which polarized neutron traverse and obtained polarization distribution images at each phase and its wavelength dependence. We analyzed the wavelength dependence of polarization and estimated the field strength at each phase. As a result, sinusoidal waveform of the AC field was successfully reproduced and its strength was almost corresponded to the value that expected from applied AC current.

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