Development of neutron phase space transfer optical devices

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Changes in neutron intensity and diffraction angle form a vibrating quartz single crystal were investigated by a 2D neutron detector and time-of-flight method.A X-cut quartz single crystal in size of 3mm×120mm×14mm was used in an experiment. Quartz single crystal has polarization according to a X-axis, thus, perpendicular cut to this axis, I.e., X-cut has the largest displacement. Bias voltage of 40 V was applied to aluminum electrodes fabricated on the quartz crystal, and it was moved in the characteristic vibration frequency of 22.7 kHz. Maximum displacement of c.a. 5μm was observed using a microscope.A neutron diffraction experiment was carried out on the ULS (Ultra Small angle neutron scattering) system in JRR-3M; neutron beam of wavelength of 4.7 angstrom was used. A combination of a ZnS:Li scintillator and a position sensitive photo multiplier was used as a neutron detector. Neutron diffraction patterns were obtained with a vibrating quartz single crystal in 22.7 kHz; change of neutron diffraction patterns according to vibration period. Neutron intensity had two strong components. Velocity of 4.7 angstrom neutrons are c.a. 840 m/s, thus they move 1.8 cm in 44μs, I.e., a half of the vibration period. By change of 1.8 cm in position of the detector, neutron intensity was changed according to phase shifting in pi.Experimental results were compared with theoretical estimation. In the case of displacement caused by the Doppler effect was larger than that caused by deformation, experimental results of time dependence of diffracted neutrons' intensity were suit for a theoretical result.