Abstract
In order to save the limited space of polarized neutron scattering spectrometer and realize the high efficiency spin flip for the given energy band cold neutrons. A compact neutron flipper is established using the spontaneous attenuation magnetic field of polarizer as gradient magnetic field. The real calculation method is introduced,and spontaneous attenuation data of gradient magnetic field along the neutron beam flight is measured. Based on the real neutron wave band and workable dimension,the key parameters and flip probability for neutron flipper are calculated,and the distribution of neutron spin projection on the real magnetic field along the spin flipper is simulated. Finally,the measurement is done and the correction of the designed neutron flipper is discussed as well. Experimental results indicate that the flip probability can reach over 99. 2%. The designed neutron spin flipper can satisfy the anticipant requirements,which can be used for construction of polarized neutron scattering instruments.
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