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Development of neutron phase space transfer optical devices

中子相空间传输光学器件的研制

基本信息

批准号：
17360448
负责人：
KANEKO Junichi
金额：
$ 8.55万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360448/
关键词：
neutron optical device transfer of phase space single crystal vibration quartz Doppler effect

项目摘要

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.

利用二维中子探测器和飞行时间法研究了振动石英单晶的中子强度和衍射角的变化，实验中使用了尺寸为3 mm × 120 mm × 14 mm的X切石英单晶。石英单晶具有根据X轴的偏振，因此，垂直于该轴切割，即，X-cut具有最大的位移。将40 V的偏压施加到在石英晶体上制造的铝电极上，并且使其在22.7kHz的特征振动频率下移动。c.a.的最大位移在JRR-3 M的超小角中子散射（ULS）系统上进行了中子衍射实验，使用波长为4.7埃的中子束。ZnS：Li闪烁体和位置敏感光电倍增管的组合被用作中子探测器。用振动石英单晶在22.7 kHz下获得中子衍射图案;根据振动周期的中子衍射图案的变化。中子强度有两个强分量。4.7埃中子的速度为c.a. 840 m/s，因此它们在44μs内移动1.8 cm，即，振动周期的一半。通过改变探测器位置1.8cm，使中子强度随π相移的变化而变化，并将实验结果与理论估算进行了比较。在多普勒效应引起的位移大于形变引起的位移的情况下，衍射中子强度随时间变化的实验结果与理论结果相吻合。