High-reflectivity multilayer monochromators for neutrons
High-reflectivity multilayer monochromators for neutrons
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高反射率多层中子单色仪
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
A. Saxena
中科院分区：
文献类型：
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作者：
A. Saxena
采用射频技术制备了Ni-Ti多层膜溅射系统多层膜的反射率用具有0.29 mrad的射束发散度和0.32 mm的射束宽度的中子射束测量。 多层膜的反射率和它们的衍射特性进行了比较，从动力学理论的完美的多层膜的结果。然后，试图尽量减少在多层膜的缺陷，并获得良好的反射率与小d间距的多层膜。多层膜的d间距从60埃可以制造的反射率在0.95和1.00之间。
Ni–Ti multilayers were fabricated in an r.f. sputtering system. Reflectivities of the multilayers were measured with a neutron beam having a beam divergence of 0.29 mrad and a beam width of 0.32 mm. Reflectivities of the multilayers and their diffraction properties were compared with results obtained from the dynamical theory for perfect multilayers. Attempts were then made to minimize the imperfections in multilayers and obtain good-reflectivity multilayers with small d spacings. Multilayers with d spacings from 60 A up could be fabricated with reflectivities between 0.95 and 1.00.