Design of ellipse focusing mirror for neutron powder diffraction complex
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摘要: 为使中子粉末衍射谱仪满足小样品研究需要，设计了一维椭圆聚焦镜系统并对参数进行了优化，同时对椭圆聚焦镜的相关参数做了较为详细讨论。采用椭圆解析计算和中子追迹程序McStas模拟两种方法，计算了椭圆聚焦镜参数对样品处中子注量率的影响，并以样品处中子注量率最大化为目标给出了优化参数，结果表明，在单色器（椭圆左焦点）到样品（椭圆右焦点）距离为2.7 m情况下，采用超镜因子为3、长度为25 cm的椭圆聚焦镜，其最佳位置为距离样品560 mm处、椭圆长半轴为1 350.016 mm，从而可以提高样品处注量率7倍。Abstract: To meet the requirement of small sample studies on the neutron diffraction complex, a one-dimensional ellipse focusing mirror system was designed and its parameters were optimized. The effects of elliptical focusing mirror parameters on the neutron flux at sample were evaluated by both employing elliptical analytical calculation and neutron tracing simulation package McStas. And the optimal parameters of the mirror for the maximum neutron flux were investigated and obtained. The results show that in the source (left ellipse focus) to the sample (right ellipse focus) distance of 2.7 m, the super mirror factor of 3 and the mirror length of 25 cm case, the optimum right-position of the ellipse mirror is at distance 560 mm from sample and the half long axis is 1 350.016 mm. In optimized condition, the neutron flux at the sample can be improved 7 times.
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