共查询到17条相似文献,搜索用时 203 毫秒
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液氮冷却单色仪晶体的热应变分析 总被引:1,自引:0,他引:1
本文报道了设计中的上海同步辐射装置扭摆器光源光束线站所用双晶单色仪的第一晶体液氮冷却的ANSYS有限元分析结果,晶面倾斜误差RMS值为2.33μrad;尝试了用光学追迹的SHADOW软件计算晶体受光面变形对晶体摇摆曲线展宽的贡献,结果表明液氮冷却晶体的参数能够满足同步辐射光束线站对单色仪晶体的要求,晶体冷却设计方案是可行的,用SHADOW软件模拟计算晶体摇摆曲线的方法是预言晶体光学参数的行之有效的方法。 相似文献
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中子应力谱仪常用聚焦单色器的模拟与比较 总被引:1,自引:0,他引:1
用蒙特卡罗中子射线追踪程序McStas对中子衍射应力谱仪单色器部件进行模拟优化:以Cu(220)比较了单色器起飞角和准直系统对样品处中子注量率、分辨率的影响;计算得到给定条件下单色器最佳单晶条数和镶嵌度;单晶条倾角精度建议好于0.1°;计算了Cu(222)、(220)和(002)在不同起飞角情况下获得的中子注量率;相同条件下,Cu和Ge常用晶体单色器中以Cu(220)获得的中子注量率最大,而Cu(222)获得的波长分辨率最佳。 相似文献
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为获得高能量分辨率、高准直的同步辐射光,应用X射线衍射动力学原理,并依据上海光源小角散射线站光学参数,设计并加工了两次衍射的单晶硅(111)面沟槽型单色器。测量了两反射面平行度、斜切角及摇摆曲线,并对摇摆曲线的测量值进行了误差分析。理论模拟与实验数据对比分析显示:有效减小晶体加工过程中的残余应力导致的晶格畸变、改善晶体形貌、调整斜切角与增加衍射级次可降低晶体的衍射角宽,进而提高出射光的准直性和能量分辨率。经计算,在同步辐射光能量为10keV条件下,单晶硅(111)面沟槽型单色器的本征能量分辨率为1.452×10~(-4)。 相似文献
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In SSRF, the design of 1st crystal cooling geometry of double crystal monochromator with sagittal focus is mainly reported by China. Our simulation indicates that the broadening of the full width at half maximum of the rocking curve of the double crystal monochromator induced by the heat load is about 3.7 μrad, and is in agreement with the experimental value of 5 μrad. Our scheme showed that the photon flux is reliably linear with electron current of the storage ring, which is extracted from the monochromator. 相似文献
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为探索常波长模式的超小角中子散射(USANS)谱仪技术,在广泛调研的基础上对USANS谱仪作原理设计,用Simres、NOP程序以及解析方法,进行了单色器/分析器的切槽单晶设计,谱仪前置单色器设计,并计算了谱仪最小Q分辨。结果表明,达尔文平台宽度影响谱仪的最小Q分辨,设计选取的Si单晶几个晶面的角度分辨足可使USANS系统的最小Q分辨达10-5量级,在单色化的中子导管后端,USANS谱仪使用垂直聚焦单色器并不明显增加样品台注量率,为简化单色器结构及其加工,建议对单色化中子后端的USANS谱仪采用非聚焦前置单色器。 相似文献
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Patrik Vagovi? Dušan Korytár Claudio Ferrari 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,265(2):599-604
A monolithic monochromator (+n, −n, −m, +m) made of a single block of Ge crystal designed for CoKα1 radiation was developed and tested numerically and experimentally by means of X-ray diffraction. The advantage of monolithic devices is their mechanical stability and the alignment of such optics is much easier than with polylithic optics, but the development of these devices is rather demanding. The presented monochromator belongs to a group of coplanar in-line devices, which means that the input beam is parallel with the output beam. For the estimation of the spectral and angular properties of a diffracted beam of this monochromator (such as bandpass width, output divergence and input acceptance) we used a numerical approach which we call spectral-angular function. It takes into account both the vertical and the horizontal divergence of the input radiation and uses two-beam X-ray dynamical theory of diffraction. Experimentally, the monochromator was tested by means of X-ray diffraction (synchrotron radiation testing) and the results from this characterization are presented. The influence of the vertical divergence on the spectral distribution of the diffracted beam is discussed and compared with previously published analytical results. 相似文献
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Cs_2LiYCl_6:Ce~(3+)(CLYC)晶体是一种性能优异的无机闪烁晶体,具有良好的n/γ脉冲形状甄别能力。传统的电荷比较法常用来甄别CLYC晶体的n/γ,通过优化积分时间窗口的宽度来获得最优的甄别结果,计算量大。本文提出利用Fisher线性判别进行CLYC晶体的n/γ波形甄别,以获得高甄别品质因子为准则来构建投影向量。n/γ混合场由Am-Be源产生,用泰科DPO7104示波器记录探测器信号。结果表明,构建投影向量后,Fisher线性判别方法计算量小、可移植性强,且可得到优于电荷比较法的甄别结果。 相似文献