【摘要】 速度选择器是中子小角散射谱仪的关键部件之一,可获得有一定宽度的单色中子束,本文针对不同参数模型,用Vitess程序进行了计算和优化设计,根据客观需求,得到优化的速度选择器参数。并对速度选择器后中子光学特性进行分析,发现转子倾角和束流发散度对中子光学特性影响明显。更多还原

【Abstract】 Velocity selector is a key component of small angle neutron scattering instrument,and single wavelength neutron beam of small spectral width can be acquired by a velocity selector.In this work,a rotor-type velocity selector was simulated using the Vitess code to optimize design parameters of the velocity selector for certain experimental requirement.Spectral characteristic of the selected neutrons was analyzed,and it was found that divergence of the incident neutron beam and tilt angle of the rotor affected the spectral characteristic of neutron beam markedly.更多还原