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Rocking curve of the collimator In order to test the new method two identical collimators (collimation angle Γ 1 =Γ 2 =36′) are measured at SV30 Tipple Axis Spectrometer in China Institute of Atomic Energy. The FWHM of the neutron source (Γ S ) is 43mrad according to the instrument configuration. The experiment result of rocking curve is shown in figure 2. After fitting the rocking curve using Gaussian function the FWHM (Γ S+1+2 ) is fitted to be 14.84mrad. The collimation angle is calculated to be 36.59′using the Eq. (6), which has a relative error of 1.65% with real value.  

Rocking curve of the collimator In order to test the new method two identical collimators (collimation angle Γ 1 =Γ 2 =36′) are measured at SV30 Tipple Axis Spectrometer in China Institute of Atomic Energy. The FWHM of the neutron source (Γ S ) is 43mrad according to the instrument configuration. The experiment result of rocking curve is shown in figure 2. After fitting the rocking curve using Gaussian function the FWHM (Γ S+1+2 ) is fitted to be 14.84mrad. The collimation angle is calculated to be 36.59′using the Eq. (6), which has a relative error of 1.65% with real value.  

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Fig.2. Rocking curve of the collimator In order to test the new method...
Table 2 . FWHM of the rocking curve with different collimation angle of...
A new method for analyzing collimation angle of neutron Soller collimator
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  • Mar 2015
A new method for analyzing the collimation angle of a neutron Soller collimator is described. A Gaussian distribution formula is used to define the angular distribution function of the neutron source and the neutron transmission function of the Soller collimator. A relationship between the FWHM of the collimator rocking curve and the collimation an...
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... to the instrument configuration. The experiment result of rocking curve is shown in figure 2. After fitting the rocking curve using Gaussian function the FWHM (Γ S+1+2 ) is fitted to be 14.84mrad. ...

Citations

... It is achieved by a bundle of small tubes or a stack of equispaced plates within the collimator hole [4] . At present, Soller collimators are mainly studied in the field of neutron scattering [5] [6] . In the study of neutron radiography, an analysis of a Soller collimator for thermal neutrons concerning the intensity and collimation angle of the neutron beam at different distances from the exit of the collimator is presented by M. dinca et al [7] . ...
... The influence of the peak position of neutron angular distribution is reflected not only in the distance between the sample and scintillation screen, but also in the spot formed by neutrons passing through the conversion screen. Fig. 12 shows the light spots generated by neutrons passing through the divergent collimator and a 250 μm thick 6 LiF-ZnS (Ag) conversion screen. For the divergent collimator, as dpc increases, the light spot shifts significantly, which reduces the neutron radiography resolution and causes image distortion. ...
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