与聚焦馈送器相结合的双光谱光束提取
Bi-spectral beam extraction in combination with a focusing feeder
摘要：
双谱束提取将来自两种不同类型的慢化剂的中子组合到一条束线中，从而扩大了光谱范围，从而扩大了仪器的利用率。这个想法可以通过反射镜来实现，该反射镜将长波长中子从离轴较冷的慢化剂反射到与另一慢化剂对准的中子导管中，该另一慢化剂发射具有较短波长的中子，该较短波长的中子将透射通过反射镜。在这种系统中使用的反射镜通常是几米长，这是一个严重的缺点，因为它减少了设计概念中的聚焦装置的可能长度，该设计概念要求在离源的短距离处的窄光束，如在为计划中的欧洲空间源（ESS）开发的许多仪器中所使用的。我们提出了一个缩短提取系统，由几个镜子，并表明，这样的提取系统是更适合于结合与馈线的针眼设计，在这里说明的情况下，一个可能的ESS成像光束线。
英文摘要：
Bi-spectral beam extraction combines neutrons from two different kind of moderators into one beamline, expanding the spectral range and thereby the utilization of an instrument. This idea can be realized by a mirror that reflects long wavelength neutrons from an off-axis colder moderator into a neutron guide aligned with another moderator emitting neutrons with shorter wavelengths which will be transmitted through the mirror. The mirror used in such systems is typically several meters long, which is a severe disadvantage because it reduces the possible length of a focusing device in design concepts requiring a narrow beam at a short distance from the source, as used in many instruments under development for the planned European Spallation Source (ESS). We propose a shortened extraction system consisting of several mirrors, and show that such an extraction system is better suited for combination with a feeder in an eye of the needle design, illustrated here in the context of a possible ESS imaging beamline.
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